BIOPLEX 2200 HSV-1 AND HSV-2 IGG ON THE BIOPLEX 2200 MULTI-ANALYTE DETECTION SYSTEM
Device Facts
| Record ID | K090409 |
|---|---|
| Device Name | BIOPLEX 2200 HSV-1 AND HSV-2 IGG ON THE BIOPLEX 2200 MULTI-ANALYTE DETECTION SYSTEM |
| Applicant | Bio-Rad Laboratories |
| Product Code | MXJ · Microbiology |
| Decision Date | May 8, 2009 |
| Decision | SESE |
| Submission Type | Traditional |
| Regulation | 21 CFR 866.3305 |
| Device Class | Class 2 |
Indications for Use
The BioPlex™ 2200 HSV-1 & HSV-2 IgG kit is a multiplex flow immunoassay intended for the qualitative detection and differentiation of IgG antibodies to herpes simplex virus type 1 (HSV-1) and herpes simplex virus type 2 (HSV-2) in human serum and EDTA or heparinized plasma. The test is indicated for sexually active individuals and expectant mothers as an aid for the presumptive diagnosis of HSV-1 or HSV-2 infection. The predictive value of positive or negative results depends on the population’s prevalence and the pretest likelihood of HSV-1 and HSV-2. The test is not FDA cleared for screening blood or plasma donors. The performance of this assay has not been established for use in a pediatric population, neonates and immunocompromised patients or for use at point of care facilities. The BioPlex 2200 HSV-1 & HSV-2 IgG kit is intended for use with the Bio-Rad BioPlex 2200 System.
Device Story
Multiplexed microparticle bead-based immunoassay; uses Luminex flow cytometry technology. Input: human serum, EDTA, or heparinized plasma. Process: patient sample, diluent, and antigen-coated dyed beads incubated; anti-human IgG-phycoerythrin (PE) conjugate added; bead mixture passed through detector. Output: relative fluorescence intensity (RFI) converted to antibody index (AI). Used in clinical laboratories with BioPlex 2200 System. Internal Standard, Serum Verification, and Reagent Blank beads verify detector response, sample addition, and non-specific binding. Results aid clinicians in presumptive diagnosis of HSV-1/HSV-2 infection.
Clinical Evidence
Prospective study at 3 U.S. sites (N=289 sexually active individuals with HSV-1 test ordered; N=286 with HSV-2 test ordered; N=399 expectant mothers). Compared to commercially available immunoblot. HSV-1 sensitivity 97.6% (sexually active), 96.3% (expectant mothers); specificity 90.1% (sexually active), 99.0% (expectant mothers). HSV-2 sensitivity 90.6% (sexually active), 96.9% (expectant mothers); specificity 98.2% (sexually active), 100% (expectant mothers). CDC panel (N=100) showed 100% positive agreement for both analytes.
Technological Characteristics
Multiplexed microparticle bead-based immunoassay; Luminex flow cytometry. Recombinant gG1 (55 KD) and gG2 (31 KD) antigens. Energy source: fluorescence detection. Connectivity: integrated with BioPlex 2200 System. Software: automated analysis of RFI to calculate antibody index. Standards: CLSI EP5-A2 (precision), EP7-A2 (interference).
Indications for Use
Indicated for sexually active individuals and expectant mothers as an aid for the presumptive diagnosis of HSV-1 or HSV-2 infection. Not for screening blood/plasma donors. Performance not established for pediatric, neonates, immunocompromised patients, or point-of-care use.
Regulatory Classification
Identification
Herpes simplex virus serological assays are devices that consist of antigens and antisera used in various serological tests to identify antibodies to herpes simplex virus in serum. Additionally, some of the assays consist of herpes simplex virus antisera conjugated with a fluorescent dye (immunofluorescent assays) used to identify herpes simplex virus directly from clinical specimens or tissue culture isolates derived from clinical specimens. The identification aids in the diagnosis of diseases caused by herpes simplex viruses and provides epidemiological information on these diseases. Herpes simplex viral infections range from common and mild lesions of the skin and mucous membranes to a severe form of encephalitis (inflammation of the brain). Neonatal herpes virus infections range from a mild infection to a severe generalized disease with a fatal outcome.
Special Controls
*Classification.* Class II (special controls). The device is classified as class II (special controls). The special control for the device is FDA's revised guidance document entitled “Class II Special Controls Guidance Document: Herpes Simplex Virus Types 1 and 2 Serological Assays.” For availability of the guidance revised document, see § 866.1(e).
Predicate Devices
- HerpeSelect® 1 and 2 immunoblot (K000238)
Related Devices
- K120959 — BIOPLEX 2200 HSV-1 AND HSV-2 IGG KIT · Bio-Rad Laboratories · Jun 22, 2012
- K062543 — HERPESELECT 1 AND 2 PLEXUS IGG, MODEL MP0900G · Focus Diagnostics, Inc. · Feb 1, 2007
Submission Summary (Full Text)
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# 510(k) SUBSTANTIAL EQUIVALENCE DETERMINATION DECISION SUMMARY
A. 510(k) Number:
K090409
B. Purpose for Submission:
New device.
C. Measurand:
Herpes Simplex Virus (HSV-1 and HSV-2) type specific IgG antibodies to the HSV glycoprotein G (gG) 1 antigen and gG2 antigen.
D. Type of Test:
Multiplexed micro particle immunoassay based on Luminex technology
E. Applicant:
Bio-Rad Laboratories
F. Proprietary and Established Names:
BioPlex™ 2200 HSV 1 & 2 Kit
G. Regulatory Information:
1. Regulation section:
21 CFR 866.3305 - Herpes Simplex Virus Serological Reagents
2. Classification:
Class II (Special Controls)
3. Product code:
MXJ and MYF
4. Panel:
Microbiology (83)
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H. Intended Use:
1. Intended use(s):
The BioPlex™ 2200 HSV-1 & HSV-2 IgG kit is a multiplex flow immunoassay intended for the qualitative detection and differentiation of IgG antibodies to herpes simplex virus type 1 (HSV-1) and herpes simplex virus type 2 (HSV-2) in human serum and EDTA or heparinized plasma. The test is indicated for sexually active individuals and expectant mothers as an aid for the presumptive diagnosis of HSV-1 or HSV-2 infection. The predictive value of positive or negative results depends on the population’s prevalence and the pretest likelihood of HSV-1 and HSV-2.
The test is not FDA cleared for screening blood or plasma donors. The performance of this assay has not been established for use in a pediatric population, neonates and immunocompromised patients or for use at point of care facilities.
The BioPlex 2200 HSV-1 & HSV-2 IgG kit is intended for use with the Bio-Rad BioPlex 2200 System.
2. Indication(s) for use:
Same as Intended Use
3. Special conditions for use statement(s):
For prescription use only
4. Special instrument requirements:
Bio-Rad BioPlex 2200 System.
I. Device Description:
The BioPlex 2200 HSV-1 & HSV-2 IgG kit is a multiplexed micro particle bead based immunoassay for the qualitative detection of IgG antibodies to HSV glycoprotein G (gG) 1 and 2 in human serum and EDTA or heparinized plasma using the Luminex flow cytometry technology
J. Substantial Equivalence Information:
1. Predicate device name(s):
Reference Method for clinical evaluation: HerpeSelect® 1 and 2 immunoblot,
2. Predicate K number(s):
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K000238
3. Comparison with predicate:
| Similarities | | |
| --- | --- | --- |
| Item | Device | Predicate |
| Intended Use | The BioPlex™ 2200 HSV-1 & HSV-2 IgG kit is a multiplex flow immunoassay intended for the qualitative detection and differentiation of IgG antibodies to herpes simplex virus type 1 (HSV-1) and herpes simplex virus type 2 (HSV-2) in human serum and EDTA or heparinized plasma. The test is indicated for sexually active individuals and expectant mothers as an aid for the presumptive diagnosis of HSV-1 or HSV-2 infection. The predictive value of positive or negative results depends on the population's prevalence and the pretest likelihood of HSV-1 and HSV-2. The test is not FDA cleared for screening blood or plasma donors. The performance of this assay has not been established for use in a pediatric population, neonates and immunocompromised patients or for use at point of care facilities. | same |
| matrix | serum | same |
| antigen | 1. Recombinant gG1 antigen (molecular weight 55 KD) 2. Recombinant gG2 antigen (molecular weight 31 KD) | 1. HSV native virus antigens 2. Recombinant gG1 antigen 35-45 KD 3. Recombinant gG2 antigen 80-110 KD |
| Differences | | |
| --- | --- | --- |
| Item | Device | Predicate |
| Method | Multiplexed microparticle flow cytometry immunoassay | Immunoblot assay |
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K. Standard/Guidance Document referenced (if applicable):
CLSI EP5: Evaluation of Precision Performance of Clinical Chemistry Devices-Second Edition, Villanova PA
CLSI EP7-A2: Interference Testing in Clinical Chemistry; Approved Guideline, 2nd Ed. (2005).
L. Test Principle:
The BioPlex 2200 HSV-1 & HSV-2 IgG kit is an automated system, it uses the following procedure.
The kit contains two different populations of dyed beads are each coated with HSV 1 &2 gG1 and gG2 antigens. The BioPlex 2200 System combines an aliquot of patient sample, sample diluent, and bead set reagent into a reaction vessel. The mixture is incubated at 37°C. After a wash cycle, anti-human IgG antibody, conjugated to phycoerythrin (PE), is added to the dyed beads and this mixture is incubated at 37°C. The excess conjugate is removed in another wash cycle, and the beads are resuspended in wash buffer. The bead mixture then passes through the detector. The identity of the dyed beads is determined by the fluorescence of the dyes, and the amount of antibody captured by the antigen is determined by the fluorescence of the attached PE. Raw data is calculated in relative fluorescence intensity (RFI).
Three additional dyed beads, an Internal Standard Bead (ISB), a Serum Verification Bead (SVB) and a Reagent Blank Bead (RBB) are present in each reaction mixture to verify detector response, the addition of serum to the reaction vessel and the absence of significant non-specific binding in serum.
The instrument is calibrated using a set of 4 distinct calibrator vials, supplied separately by Bio-Rad Laboratories. The 4 vials representing 4 different antibody concentrations are used for calibration. The result for each of these antibodies is expressed as an antibody index (AI).
M. Performance Characteristics (if/when applicable):
1. Analytical performance:
a. Precision/Reproducibility:
A Precision panel, consisting of 8 panel members was prepared by Bio-Rad Laboratories. For each analyte, 2 of the 8 panel members had high positive levels of the antibodies, 2 had low positive levels of the antibodies, and 2 had antibody levels near the cutoff; additionally there were 2 high negative panel members.
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Precision testing was performed at Bio-Rad Laboratories on one lot of the HSV-1 & HSV-2 IgG Reagent Pack, one lot of the HSV-1 & HSV-2 IgG Calibrator Set and one lot of the HSV-1 & HSV-2 IgG Control Set. Each of the 8 panel members was tested in duplicate (x2) on 2 runs per day for 20 days (2 times x 2 runs x 20 days = 80 replicates per panel member). The data were analyzed for intra-assay and inter-assay precision according to the principles described in the Clinical Laboratory Standards Institute guidance EP5-A2, revised November 2004. The standard deviation (SD) and percent coefficient of variation (%CV) were calculated. Results are shown below.
Precision: BioPlex 2200 HSV-1 IgG Serum
| HSV-1 IgG Panel Members | BioPlex 2200 HSV-1 IgG | | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | Sample N | Mean AI | Within Run | | Between | | Between | | Total | |
| | | | SD | %CV | SD | %CV | SD | %CV | SD | %CV |
| High Positive | 80 | 3.2 | 0.14 | 4.4% | 0.16 | 5.0% | 0.00 | 0.0% | 0.21 | 6.6% |
| High Positive | 80 | 3.6 | 0.16 | 4.3% | 0.08 | 2.2% | 0.10 | 2.7% | 0.20 | 5.5% |
| Low Positive | 80 | 1.3 | 0.05 | 3.7% | 0.02 | 1.5% | 0.03 | 2.5% | 0.06 | 4.7% |
| Low Positive | 80 | 1.7 | 0.08 | 4.9% | 0.09 | 5.5% | 0.03 | 1.7% | 0.13 | 7.6% |
| Near Cutoff | 80 | 1.0 | 0.03 | 2.7% | 0.03 | 3.4% | 0.03 | 2.9% | 0.05 | 5.2% |
| Near Cutoff | 80 | 1.1 | 0.04 | 3.9% | 0.03 | 2.7% | 0.02 | 2.2% | 0.06 | 5.2% |
| High Negative | 80 | 0.7 | 0.04 | 5.8% | 0.00 | 0.0% | 0.01 | 2.0% | 0.04 | 6.1% |
| High Negative | 80 | 0.5 | 0.02 | 4.5% | 0.02 | 3.2% | 0.01 | 2.6% | 0.03 | 6.1% |
Precision: BioPlex 2200 HSV-2 IgG Serum
| HSV-2 IgG Panel Members | BioPlex 2200 HSV-2 IgG | | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | Sample N | Mean AI | Within Run | | Between | | Between | | Total | |
| | | | SD | %CV | SD | %CV | SD | %CV | SD | %CV |
| High Positive | 80 | 5.5 | 0.17 | 3.0% | 0.20 | 3.6% | 0.03 | 0.5% | 0.26 | 4.8% |
| High Positive | 80 | 4.4 | 0.17 | 3.8% | 0.07 | 1.5% | 0.11 | 2.4% | 0.21 | 4.8% |
| Low Positive | 80 | 1.8 | 0.09 | 5.2% | 0.02 | 1.2% | 0.05 | 2.9% | 0.11 | 6.1% |
| Low Positive | 80 | 2.4 | 0.09 | 3.8% | 0.09 | 3.6% | 0.09 | 3.6% | 0.15 | 6.3% |
| Near Cutoff | 80 | 1.3 | 0.05 | 3.8% | 0.04 | 2.7% | 0.02 | 1.4% | 0.06 | 4.9% |
| Near Cutoff | 80 | 1.1 | 0.06 | 5.2% | 0.04 | 3.2% | 0.02 | 2.1% | 0.07 | 6.5% |
| High Negative | 80 | 0.8 | 0.05 | 5.8% | 0.03 | 3.4% | 0.01 | 1.3% | 0.05 | 6.8% |
| High Negative | 80 | 0.6 | 0.03 | 4.6% | 0.00 | 0.0% | 0.02 | 2.9% | 0.03 | 5.4% |
The assays reproducibility was assessed at three sites using serum, EDTA and heparinized plasma samples. A reproducibility panel was prepared at Bio-Rad Laboratories and consisted of 8 panel members and the HSV-1 & HSV-2 IgG positive control. Reproducibility testing was performed using 3 lots of the HSV-1 & HSV-2 IgG Reagent Pack, 3 lots of the HSV-1 & HSV-2 IgG Calibrator set and 3 lots of the HSV-1 & HSV-2 IgG Control set (one lot at each site). Each of the reproducibility panel members were tested in duplicate on two runs per day, for 5 days, on 3 lots (2 replicates x 2 runs x 5 days x 3 lots = 60 replicates per panel member). The data were analyzed for intra-assay
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and inter-assay reproducibility according to the principles described in the Clinical Laboratory Standards Institute (CLSI) guidance EP15-A2 (Vol. 25, No. 17). The standard deviation (SD) and prevent coefficient of variation (% CV) were calculated. Results for the serum reproducibility study are shown below.
| HSV-1 IgG Panel Members | BioPlex 2200 HSV-1 IgG | | | | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | Sample N | Mean AI | Within-Run | | Between- | | Between- | | Between- | | Total | |
| | | | SD | %CV | SD | %CV | SD | %CV | SD | %CV | SD | %CV |
| High Positive | 60 | 3.6 | 0.159 | 4.4% | 0.000 | 0.0% | 0.178 | 4.9% | 0.081 | 2.2% | 0.252 | 6.9% |
| High Positive | 60 | 3.8 | 0.132 | 3.5% | 0.095 | 2.5% | 0.125 | 3.3% | 0.413 | 10.9% | 0.461 | 12.2% |
| Low Positive | 60 | 1.5 | 0.090 | 6.2% | 0.000 | 0.0% | 0.073 | 5.0% | 0.167 | 11.4% | 0.203 | 13.9% |
| Low Positive | 60 | 1.3 | 0.058 | 4.5% | 0.034 | 2.7% | 0.058 | 4.5% | 0.113 | 8.9% | 0.144 | 11.3% |
| Near Cutoff | 60 | 1.0 | 0.050 | 5.2% | 0.018 | 1.9% | 0.047 | 4.9% | 0.128 | 13.4% | 0.146 | 15.3% |
| Near Cutoff | 60 | 0.9 | 0.047 | 5.1% | 0.052 | 5.6% | 0.030 | 3.2% | 0.099 | 10.7% | 0.124 | 13.5% |
| High Negative | 59** | 0.6 | 0.013 | 2.3% | 0.000 | 0.0% | 0.018 | 3.2% | 0.053 | 9.5% | 0.058 | 10.3% |
| High Negative | 60 | 0.6 | 0.034 | 5.9% | 0.000 | 0.0% | 0.023 | 3.9% | 0.024 | 4.2% | 0.048 | 8.3% |
| Positive Control | 60 | 3.0 | 0.127 | 4.2% | 0.092 | 3.0% | 0.108 | 3.5% | 0.137 | 4.5% | 0.235 | 7.7% |
* Between-site variance includes between lot variance.
** One replicate lost due to laboratory error.
| HSV-2 IgG Panel Members | BioPlex 2200 HSV-2 IgG | | | | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | Sample N | Mean AI | Within-Run | | Between- | | Between- | | Between- | | Total | |
| | | | SD | %CV | SD | %CV | SD | %CV | SD | %CV | SD | %CV |
| High Positive | 59** | 3.0 | 0.149 | 5.0% | 0.124 | 4.1% | 0.000 | 0.0% | 0.155 | 5.2% | 0.249 | 8.2% |
| High Positive | 60 | 3.5 | 0.121 | 3.4% | 0.135 | 3.8% | 0.093 | 2.6% | 0.226 | 6.4% | 0.304 | 8.6% |
| Low Positive | 60 | 1.8 | 0.111 | 6.1% | 0.000 | 0.0% | 0.074 | 4.1% | 0.145 | 7.9% | 0.197 | 10.7% |
| Low Positive | 60 | 1.5 | 0.061 | 4.0% | 0.047 | 3.1% | 0.059 | 3.9% | 0.117 | 7.8% | 0.151 | 10.1% |
| Near Cutoff | 60 | 1.2 | 0.052 | 4.3% | 0.034 | 2.9% | 0.059 | 4.9% | 0.063 | 5.3% | 0.106 | 8.9% |
| Near Cutoff | 60 | 1.2 | 0.034 | 2.9% | 0.072 | 6.0% | 0.040 | 3.4% | 0.069 | 5.8% | 0.113 | 9.4% |
| High Negative | 60 | 0.7 | 0.039 | 5.2% | 0.000 | 0.0% | 0.037 | 5.1% | 0.058 | 7.9% | 0.079 | 10.7% |
| High Negative | 60 | 0.6 | 0.037 | 6.3% | 0.000 | 0.0% | 0.029 | 5.0% | 0.027 | 4.7% | 0.054 | 9.3% |
| Positive Control | 60 | 2.8 | 0.097 | 3.4% | 0.092 | 3.3% | 0.088 | 3.1% | 0.056 | 2.0% | 0.170 | 6.0% |
* Between-site variance includes between lot variance.
** One replicate lost due to laboratory error.
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b. Linearity/assay reportable range:
Not Applicable
c. Traceability, Stability, Expected values (controls, calibrators, or methods):
Not Applicable
d. Detection limit:
Not Applicable
e. Analytical specificity:
Potential cross-reactivity was evaluated as follows: Samples known to be positive for one of the twenty potential cross-reactants, as determined by FDA cleared devices, listed in the table below were evaluated with the BioPlex 2200 HSV-1 & HSV-2 IgG assays. All samples were pre-tested by a commercially available HSV-1 and HSV-2 IgG immunoblot assay and only those that tested negative by the immunoblot assay were further tested by the BioPlex 2200 HSV-1 & HSV-2 IgG kit. The results demonstrate that the various disease state samples evaluated do not cross-react with the 2 antigens in the BioPlex 2200 HSV-1 & HSV-2 IgG kit.
Cross-Reactivity
| Potential Cross-Reactant | HSV-1 IgG | | HSV-2 IgG | |
| --- | --- | --- | --- | --- |
| | N | BioPlex 2200 Negative Agreement | N | BioPlex 2200 Negative Agreement |
| ANA IgG | 5 | 5/5 | 10 | 10/10 |
| Candida albicans | 8 | 8/8 | 9 | 9/9 |
| CMV IgG | 8 | 8/8 | 8 | 8/8 |
| E. coli | 2 | 2/2 | 8 | 8/8 |
| Toxoplasma gondii IgG | 8 | 8/8 | 8 | 8/8 |
| HCV IgG | 7 | 7/7 | 10 | 9/10* |
| VZV IgG | 10 | 10/10 | 10 | 10/10 |
| Rubella IgG | 6 | 6/6 | 7 | 7/7 |
| HBs Antibody | 8 | 8/8 | 9 | 9/9 |
| EBV-VCA IgG | 7 | 7/7 | 7 | 7/7 |
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| Syphilis IgG | 4 | 4/4 | 7 | 7/7 |
| --- | --- | --- | --- | --- |
| N. gonorrhea | 4 | 4/4 | 10 | 10/10 |
| HPV IgG | 10 | 10/10 | 10 | 10/10 |
| C. trachomatis | 5 | 5/5 | 9 | 9/9 |
| HIV | 10 | 10/10 | 5 | 5/5 |
| Rheumatoid Factor | 7 | 7/7 | 9 | 9/9 |
| Bacterial Vaginosis | | | | |
| - Bacteroides sp. | N/A | N/A | 6 | 4/6** |
| - Trichonomis | 10 | 10/10 | 10 | 10/10 |
| - Mobiluncus sp. | 1 | 1/1 | 4 | 4/4 |
| - Gardenella vaginalis | 10 | 10/10 | 10 | 10/10 |
* One HCV sample was identified as low positive for HSV-2 by the BioPlex 2200 HSV-2 IgG assay with an AI value of 1.3.
** Two Bacteroides sp. samples were identified HSV-2 equivocal and low positive with AI values of 1.0 and 1.1, respectively, by the BioPlex 2200 HSV-2 IgG assay.
N/A = Not available
Testing for interfering substances was conducted according to CLSI Protocol EP7-A2 (Vol. 25, No. 27). Samples were pre-pared by blending a pool of negative human serum with samples positive for HSV-1 and HSV-2 IgG to achieve values of 3.0 to 5.0 AI. Interferent or solvent (negative control) was added exogenously at levels indicated in the Table below. Test and control samples were evaluated in replicates of ten. Changes in signal ranged from -8.3 to 10.3%. No significant interference was observed in any of the substances tested.
Interfering Substances
| Substance | Concentration |
| --- | --- |
| Hemoglobin | 500 mg/dL |
| Bilirubin (unconjugated) | 20 mg/dL |
| Bilirubin (conjugated) | 30 mg/dL |
| Cholesterol | 500 mg/dL |
| Red Blood Cells | 0.4% (v/v) |
| Gamma Globulin | 6 g/dL |
| Triglyceride | 3300 mg/dL |
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| Beta Carotene | 0.6 mg/dL |
| --- | --- |
| Total Protein (albumin) | 12 g/dL |
| Ascorbic Acid | 3 mg/dL |
| Heparin Lithium | 8000 units/dL |
| Heparin Sodium | 8000 units/dL |
| EDTA | 800 mg/dL |
| Sodium Citrate | 1000 mg/dL |
f. Assay cut-off:
The cut-off value and assignment of the calibrators were determined by performing concordance and Receiver Operator Characteristic (ROC) analysis, using predicate results as the standard. Analyze-it software is used for the ROC analysis.
Based on the results, calibrator values are adjusted such that the cut-off value at time of market is equal to 1.0 AI for HSV-1 and HSV-2 IgG assay. Samples with AI values $<0.9$ are considered negative, samples with AI values $>1.1$ AI are considered positive while samples with an AI value between $>0.9$ and $<1.1$ are considered equivocal. Testing was conducted internally at Bio-Rad Laboratories.
A total of 662 samples were evaluated to confirm cut-off values established in early development. All samples were confirmed positive, negative or equivocal by the Focus HerpeSelect®1 and HerpeSelect®2 ELISA IgG predicate kits. ROC Analysis was performed for each analyte using this population of samples.
BioPlex 2200 HSV-1 and HSV-2 IgG assays met or exceeded the concordance requirements of $\geq 96\%$ and $\geq 94\%$ positive agreement as well as $\geq 95$ and $\geq 97\%$ negative agreement respectively. The results of concordance testing and ROC analysis validate the cut-off that was established for each of the analytes in the BioPlex HSV-1 and HSV-2 IgG assays.
2. Comparison studies:
a. Method comparison with reference method:
Performance of the BioPlex 2200 HSV-1 & HSV-2 IgG kit in the intended use populations was tested against a commercially available immunoblot test in a prospective study conducted at a total of 3 U.S. clinical sites. For purposes of sensitivity and specificity calculations, the BioPlex 2200 equivocal results were
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assigned to the opposite clinical interpretation than that of the corresponding immunoblot result. Likewise, immunoblot equivocal results were assigned to the opposite clinical interpretation than that of the BioPlex 2200 result.
## Performance in Sexually Active Individuals
The sensitivity and specificity of the HSV-1 & HSV-2 IgG kit was assessed using leftover serum samples from sexually active individuals where an HSV-1 test was ordered (N=289) and sexually active individuals where an HSV-2 test was ordered (N=286). Samples were tested at 3 U.S. clinical sites. Combined results from all sites are shown in the Tables below.
Sexually Active Individuals with an HSV-1 Test Ordered: BioPlex 2200 HSV-1 IgG vs. Immunoblot (N = 289)
| | BioPlex 2200 HSV-1 IgG | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | | Positive | Equivocal | Negative | Total | % Sensitivity | 95% Confidence Interval | % Specificity | 95% Confidence Interval |
| Commercially Available HSV-1 IgG Immunoblot | Positive | 202 | 1 | 1 | 204 | 97.6% (202/207) | (94.5 - 99.0%) | 90.1% (73/81) | (81.7 - 94.9%) |
| | Equivocal | 1 | 1 | 3 | 5 | | | | |
| | Negative | 4 | 3 | 73 | 80 | | | | |
| | Total | 207 | 5 | 77 | 289 | | | | |
Sexually Active Individuals with an HSV-2 Test Ordered: BioPlex 2200 HSV-2 IgG vs. Immunoblot (N = 286)
| | BioPlex 2200 HSV-2 IgG | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | | Positive | Equivocal | Negative | Total | % Sensitivity | 95% Confidence Interval | % Specificity | 95% Confidence Interval |
| Commercially Available HSV-2 IgG Immunoblot | Positive | 106 | 1 | 10 | 117 | 90.6% (106/117) | (83.9 - 94.7%) | 98.2% (166/169) | (94.9 - 99.4%) |
| | Equivocal | 0 | 0 | 0 | 0 | | | | |
| | Negative | 3 | 0 | 166 | 169 | | | | |
| | Total | 109 | 1 | 176 | 286 | | | | |
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# Performance in Expectant Mothers
The sensitivity and specificity of the HSV-1 & HSV-2 IgG kit was assessed using leftover serum samples from expectant mothers $(N = 399)$ . Results are shown in the Tables below.
Expectant Mothers: BioPlex HSV-1 IgG vs. Immunoblot $(N = 399)$
| | BioPlex 2200 HSV-1 IgG | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | | Positive | Equivocal | Negative | Total | % Sensitivity | 95% Confidence Interval | % Specificity | 95% Confidence Interval |
| Commercially Available HSV-1IgG Immunoblot | Positive | 287 | 2 | 8 | 297 | 96.3% (287/298) | (93.5 - 97.9%) | 99.0% (100/101) | (94.6 - 99.8%) |
| | Equivocal | 0 | 0 | 1 | 1 | | | | |
| | Negative | 1 | 0 | 100 | 101 | | | | |
| | Total | 288 | 2 | 109 | 399 | | | | |
Expectant Mothers: BioPlex HSV-2 IgG vs. Immunoblot $(N = 399)$
| | BioPlex 2200 HSV-2 IgG | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | | Positive | Equivocal | Negative | Total | % Sensitivity | 95% Confidence Interval | % Specificity | 95% Confidence Interval |
| Commercially Available HSV-2 IgG Immunoblot | Positive | 157 | 0 | 4 | 161 | 96.9% (157/162) | (93.0 - 98.7%) | 100% (237/237) | (98.4 - 100%) |
| | Equivocal | 0 | 0 | 1 | 1 | | | | |
| | Negative | 0 | 0 | 237 | 237 | | | | |
| | Total | 157 | 0 | 242 | 399 | | | | |
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# Agreement with CDC Panel
The performance of the BioPlex 2200 HSV-1 & HSV-2 IgG kit was assessed using a masked, well characterized HSV serum panel from the CDC. The panel consists of $24\%$ HSV-1 and HSV-2 dual-positive samples, $50\%$ HSV-1 positive and $50\%$ HSV-1 negative samples and $48\%$ HSV-2 positive and $52\%$ HSV-2 negative samples. The results are presented to convey further information on the performance of the test kit and do not imply endorsement of the assay by the CDC. Results are shown below.
BioPlex 2200 HSV-1 IgG vs. CDC HSV Panel (N = 100)
| | BioPlex 2200 HSV-1 IgG | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | | Positive | Equivocal | Negative | Total | Positive (+) %Agreement | 95% Confidence Interval | Negative (-) %Agreement | 95% Confidence Interval |
| CDC HSV-1 Result | Positive | 50 | 0 | 0 | 50 | 100% (50/50) | (92.8 - 100%) | 96.0% (48/50) | (86.5 - 98.9%) |
| | Equivocal | 0 | 0 | 0 | 0 | | | | |
| | Negative | 0 | 2 | 48 | 50 | | | | |
| | Total | 50 | 2 | 48 | 100 | | | | |
BioPlex 2200 HSV-2 IgG vs. CDC HSV Panel (N = 50)
| | BioPlex 2200 HSV-2 IgG | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | | Positive | Equivocal | Negative | Total | Positive (+) %Agreement | 95% Confidence Interval | Negative (-) %Agreement | 95% Confidence Interval |
| CDC HSV-2 Result | Positive | 50 | 0 | 0 | 50 | 100% (50/50) | (92.8 - 100%) | 100% (50/50) | (92.8 - 100%) |
| | Equivocal | 0 | 0 | 0 | 0 | | | | |
| | Negative | 0 | 0 | 50 | 50 | | | | |
| | Total | 50 | 0 | 50 | 100 | | | | |
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# Performance in a Low Prevalence Population
The sensitivity and specificity of the HSV-1 & HSV-2 IgG kit was assessed using leftover serum samples from a low-prevalence population, collected in a non-STD setting, in people age 16-19 (N=200). Samples were tested at 2 U.S. clinical testing sites. Results are shown in the following tables.
Low-Prevalence Population, Non-STD Setting: BioPlex 2200 HSV-1 IgG vs. Immunoblot (N = 200)
| | BioPlex 2200 HSV-1 IgG | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | | Positive | Equivocal | Negative | Total | % Sensitivity | 95% Confidence Interval | % Specificity | 95% Confidence Interval |
| Commercially Available HSV-1 IgG Immunoblot | Positive | 97 | 1 | 4 | 102 | 93.3% (97/104) | (86.7-96.7%) | 97.9% (94/96) | (92.7 - 99.4%) |
| | Equivocal | 0 | 0 | 2 | 2 | | | | |
| | Negative | 2 | 0 | 94 | 96 | | | | |
| | Total | 99 | 1 | 100 | 200 | | | | |
Low-Prevalence Population, Non-STD Setting: BioPlex 2200 HSV-2 IgG vs. Immunoblot (N = 200)
| | BioPlex 2200 HSV-2 IgG | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | | Positive | Equivocal | Negative | Total | % Sensitivity | 95% Confidence Interval | % Specificity | 95% Confidence Interval |
| Commercially Available HSV-2 IgG Immunoblot | Positive | 11 | 0 | 2 | 13 | 73.3% (11/15) | NA* | 97.8% (181/185) | (94.6 - 99.2%) |
| | Equivocal | 0 | 0 | 2 | 2 | | | | |
| | Negative | 3 | 1 | 181 | 185 | | | | |
| | Total | 14 | 1 | 185 | 200 | | | | |
N/A = Not applicable. There are insufficient positive samples to calculate a statistically meaningful % sensitivity for the low-prevalence population
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b. Matrix comparison:
Matched serum and plasma (EDTA and heparin) samples drawn from 87 individual donors were acquired from commercial sources. All samples were evaluated in replicates of two. Plasma AI values were compared to matched serum AI values. All samples correlated well, the corresponding slopes of regression and square of correlation (R²) was 0.99.
3. Clinical studies:
a. Clinical Sensitivity:
Not Applicable
b. Clinical specificity:
Not Applicable
c. Other clinical supportive data (when a. and b. are not applicable):
Not Applicable
4. Clinical cut-off:
See 1 f
5. Expected values/Reference range:
The observed prevalence and expected values for the BioPlex 2200 HSV-1 & HSV-2 IgG kit are presented by age and gender for serum samples from sexually active individuals where an HSV-1 test was ordered (N=289); sexually active individuals where an HSV-2 test was ordered (N=286); and for expectant mothers (N=399). The observed and the hypothetical positive and negative predicted values were also calculated for HSV1 &2 in both of the study populations.
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Sexually Active Individuals With an HSV-1 Test Ordered: BioPlex 2200 HSV-1 IgG (N = 289)
| Age in Years | Gender | BioPlex 2200 HSV-1 IgG | | | | | | Total |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | | Positive | | Equivocal | | Negative | | |
| | | N | % | N | % | N | % | N |
| 18-20 | F | 6 | 85.7% | 0 | 0.0% | 1 | 14.3% | 7 |
| | M | 8 | 66.7% | 0 | 0.0% | 4 | 33.3% | 12 |
| 21-30 | F | 15 | 62.5% | 0 | 0.0% | 9 | 37.5% | 24 |
| | M | 21 | 58.3% | 0 | 0.0% | 15 | 41.7% | 36 |
| 31-40 | F | 19 | 86.4% | 1 | 4.5% | 2 | 9.1% | 22 |
| | M | 23 | 71.9% | 1 | 3.1% | 8 | 25.0% | 32 |
| 41-50 | F | 17 | 81.0% | 0 | 0.0% | 4 | 19.0% | 21 |
| | M | 38 | 74.5% | 1 | 2.0% | 12 | 23.5% | 51 |
| 51-60 | F | 8 | 61.5% | 0 | 0.0% | 5 | 38.5% | 13 |
| | M | 23 | 74.2% | 2 | 6.5% | 6 | 19.4% | 31 |
| 61-70 | F | 11 | 68.8% | 0 | 0.0% | 5 | 31.3% | 16 |
| | M | 15 | 75.0% | 0 | 0.0% | 5 | 25.0% | 20 |
| 71-80 | F | 1 | 50.0% | 0 | 0.0% | 1 | 50.0% | 2 |
| | M | 2 | 100% | 0 | 0.0% | 0 | 0.0% | 2 |
| 81-89 | F | 0 | 0.0% | 0 | 0.0% | 0 | 0.0% | 0 |
| | M | 0 | 0.0% | 0 | 0.0% | 0 | 0.0% | 0 |
| Total | | 207 | 71.6% | 5 | 1.7% | 77 | 26.6% | 289 |
Note: Due to rounding numbers across columns may not total 100%.
Sexually Active Individuals With an HSV-2 Test Ordered: BioPlex 2200 HSV-2 IgG (N = 286)
| Age in Years | Gender | BioPlex 2200 HSV-2 IgG | | | | | | Total |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| | | Positive | | Equivocal | | Negative | | |
| | | N | % | N | % | N | % | N |
| 18-20 | F | 2 | 50.0% | 0 | 0.0% | 2 | 50.0% | 4 |
| | M | 2 | 22.2% | 0 | 0.0% | 7 | 77.8% | 9 |
| 21-30 | F | 10 | 38.5% | 0 | 0.0% | 16 | 61.5% | 26 |
| | M | 15 | 36.6% | 0 | 0.0% | 26 | 63.4% | 41 |
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16
| | | | | | | | | |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 31-40 | F | 9 | 69.2% | 0 | 0.0% | 4 | 30.8% | 13 |
| | M | 16 | 32.0% | 1 | 2.0% | 33 | 66.0% | 50 |
| 41-50 | F | 9 | 52.9% | 0 | 0.0% | 8 | 47.1% | 17 |
| | M | 21 | 40.4% | 0 | 0.0% | 31 | 59.6% | 52 |
| 51-60 | F | 7 | 46.7% | 0 | 0.0% | 8 | 53.3% | 15 |
| | M | 10 | 37.0% | 0 | 0.0% | 17 | 63.0% | 27 |
| 61-70 | F | 4 | 50.0% | 0 | 0.0% | 4 | 50.0% | 8 |
| | M | 4 | 20.0% | 0 | 0.0% | 16 | 80.0% | 20 |
| 71-80 | F | 0 | 0.0% | 0 | 0.0% | 0 | 0.0% | 0 |
| | M | 0 | 0.0% | 0 | 0.0% | 3 | 100% | 3 |
| 81-89 | F | 0 | 0.0% | 0 | 0.0% | 1 | 100% | 1 |
| | M | 0 | 0.0% | 0 | 0.0% | 0 | 0.0% | 0 |
| Total | | 109 | 38.1% | 1 | 0.4% | 176 | 61.5% | 286 |
## Expectant Mothers: BioPlex 2200 HSV-1 IgG (N = 399)
| Age in Years | BioPlex 2200 HSV-1 IgG | | | | | | Total |
| --- | --- | --- | --- | --- | --- | --- | --- |
| | Positive | | Equivocal | | Negative | | |
| | N | % | N | % | N | % | N |
| 14-20 | 35 | 58.3% | 0 | 0.0% | 25 | 41.7% | 60 |
| 21-30 | 133 | 70.7% | 2 | 1.1% | 53 | 28.2% | 188 |
| 31-40 | 98 | 76.0% | 0 | 0.0% | 31 | 24.0% | 129 |
| 41-50 | 21 | 100% | 0 | 0.0% | 0 | 0.0% | 21 |
| Unknown | 1 | 100% | 0 | 0.0% | 0 | 0.0% | 1 |
| Total | 288 | 72.2% | 2 | 0.5% | 109 | 27.3% | 399 |
## Expectant Mothers: BioPlex 2200 HSV-2 IgG (N = 399)
| Age in Years | BioPlex 2200 HSV-2 IgG | | | | | | Total |
| --- | --- | --- | --- | --- | --- | --- | --- |
| | Positive | | Equivocal | | Negative | | |
| | N | % | N | % | N | % | N |
| 14-20 | 12 | 20.0% | 0 | 0.0% | 48 | 80.0% | 60 |
| 21-30 | 66 | 35.1% | 0 | 0.0% | 122 | 64.9% | 188 |
| 31-40 | 68 | 52.7% | 0 | 0.0% | 61 | 47.3% | 129 |
| 41-50 | 11 | 52.4% | 0 | 0.0% | 10 | 47.6% | 21 |
| Unknown | 0 | 0.0% | 0 | 0.0% | 1 | 100% | 1 |
| Total | 157 | 39.3% | 0 | 0.0% | 242 | 60.7% | 399 |
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Summary of Observed Prevalence, Positive Predictive Value (PPV), Negative Predictive Value (NPV)
| Population | N | BioPlex 2200 HSV-1 IgG | | | BioPlex 2200 HSV-2 IgG | | |
| --- | --- | --- | --- | --- | --- | --- | --- |
| | | Prevalence | PPV | NPV | Prevalence | PPV | NPV |
| Sexually Active Individuals with an HSV-1 Test ordered | 289 | 71.6% | 96.2% | 93.6% | N/A | N/A | N/A |
| Sexually Active Individuals with an HSV-2 Test ordered | 286 | N/A | N/A | N/A | 38.1% | 97.3% | 93.8% |
| Expectant Mothers | 399 | 72.2% | 99.7% | 90.1% | 39.3% | 100% | 97.9% |
N/A = Not applicable
HSV-1 Hypothetical Predictive Values by Prevalence
| Prevalence | Sexually Active Individuals | | Expectant Mothers | |
| --- | --- | --- | --- | --- |
| | PPV | NPV | PPV | NPV |
| 80% | 97.5% | 90.4% | 99.7% | 87.0% |
| 70% | 95.8% | 94.1% | 99.6% | 92.0% |
| 60% | 93.7% | 96.2% | 99.3% | 94.7% |
| 50% | 90.8% | 97.4% | 99.0% | 96.4% |
| 40% | 86.8% | 98.3% | 98.5% | 97.6% |
| 30% | 80.9% | 98.9% | 97.6% | 98.4% |
| 25% | 76.7% | 99.1% | 97.0% | 98.8% |
| 20% | 71.1% | 99.3% | 96.0% | 99.1% |
| 15% | 63.5% | 99.5% | 94.4% | 99.3% |
| 10% | 52.3% | 99.7% | 91.5% | 99.6% |
| 5% | 34.2% | 99.9% | 83.5% | 99.8% |
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HSV-2 Hypothetical Predictive Values by Prevalence
| Prevalence | Sexually Active Individuals | | Expectant Mothers | |
| --- | --- | --- | --- | --- |
| | PPV | NPV | PPV | NPV |
| 80% | 99.5% | 72.3% | 100% | 89.0% |
| 70% | 99.2% | 81.7% | 100% | 93.3% |
| 60% | 98.7% | 87.4% | 100% | 95.6% |
| 50% | 98.1% | 91.3% | 100% | 97.0% |
| 40% | 97.1% | 94.0% | 100% | 98.0% |
| 30% | 95.6% | 96.1% | 100% | 98.7% |
| 25% | 94.4% | 96.9% | 100% | 99.0% |
| 20% | 92.6% | 97.7% | 100% | 99.2% |
| 15% | 89.9% | 98.3% | 100% | 99.5% |
| 10% | 84.8% | 98.9% | 100% | 99.7% |
| 5% | 72.6% | 99.5% | 100% | 99.8% |
N. Proposed Labeling:
The labeling is sufficient and it satisfies the requirements of 21 CFR Part 809.10.
O. Conclusion:
The submitted information in this premarket notification is complete and supports a substantial equivalence decision.
