← Product Code [LSR](/submissions/MI/subpart-d%E2%80%94serological-reagents/LSR) · K193051

# LIAISON Lyme Total Antibody Plus, LIAISON Lyme Total Antibody Plus Control Set (K193051)

_DiaSorin, Inc. · LSR · Jan 29, 2020 · Microbiology · SESE_

**Canonical URL:** https://fda.innolitics.com/submissions/MI/subpart-d%E2%80%94serological-reagents/LSR/K193051

## Device Facts

- **Applicant:** DiaSorin, Inc.
- **Product Code:** [LSR](/submissions/MI/subpart-d%E2%80%94serological-reagents/LSR.md)
- **Decision Date:** Jan 29, 2020
- **Decision:** SESE
- **Submission Type:** Traditional
- **Regulation:** 21 CFR 866.3830
- **Device Class:** Class 2
- **Review Panel:** Microbiology

## Indications for Use

LIAISON® Lyme Total Antibody Plus: The LIAISON® Lyme Total Antibody Plus assay uses chemiluminescent immunoassay (CLIA) technology for the qualitative determination of IgG and IgM antibodies to Borrelia burgdorferi in human serum and plasma (K2-EDTA, Li-heparin) samples. This assay is intended for use on samples from patients with signs and symptoms that are consistent with Lyme disease. Positive or equivocal results should be supplemented by testing with a standardized Western blot procedure. Positive supplemental results provide evidence of exposure to B. burgdorferi and can be used to support a clinical diagnosis of Lyme disease. Negative results by LIAISON® Lyme Total Antibody Plus assay should not be used to exclude Lyme disease. The test has to be performed on the LIAISON® XL Analyzer. The LIAISON® Lyme Total Antibody Plus Control Set: The LIAISON® Lyme Total Antibody Plus Control Set is intended for use as assayed quality control samples to monitor the performance of the LIAISON® Lyme Total Antibody Plus assay. The performance characteristics of LIAISON® Lyme Total Antibody Plus Control Set have not been established for any other assays or instrument platforms different from the LIAISON® XL.

## Device Story

Indirect chemiluminescent immunoassay (CLIA) for qualitative detection of IgG/IgM antibodies to Borrelia burgdorferi. Input: human serum or plasma samples. Operation: magnetic particles coated with recombinant B. burgdorferi antigens (VlsE, OspC) capture patient antibodies; mouse monoclonal anti-human IgG/IgM conjugated to isoluminol binds captured antibodies. Analyzer performs all incubation and wash steps; adds starter reagents to induce flash chemiluminescence. Output: relative light units (RLU) measured by photomultiplier, converted to index value. Used in clinical laboratories on LIAISON® XL Analyzer. Results support clinical diagnosis of Lyme disease when combined with patient history, symptoms, and supplemental Western blot testing.

## Clinical Evidence

Prospective study of 1,550 clinical samples compared subject device to predicate. Negative percent agreement was 98.7% (95% CI: 97.9%-99.2%). Second-tier Western blot testing on positive/equivocal samples showed 97.9% PPA (95% CI: 89.1%-99.6%). Additional evaluation of 280 CDC-characterized samples showed high agreement across disease stages (100% for Stage III). Precision and reproducibility studies (CLSI EP05-A3/EP15-A3) demonstrated acceptable performance (total %CV < 14%). Cross-reactivity evaluated against 238 specimens from 24 disease states.

## Technological Characteristics

Indirect CLIA; magnetic particle solid phase coated with recombinant B. burgdorferi antigens (VlsE, OspC); isoluminol-antibody conjugate; flash chemiluminescence detection via photomultiplier; automated on LIAISON® XL Analyzer; sample types: serum, K2-EDTA plasma, lithium heparin plasma; calibration via stored 10-point master curve with two-point verification.

## Regulatory Identification

Treponema pallidum treponemal test reagents are devices that consist of the antigens, antisera and all control reagents (standardized reagents with which test results are compared) which are derived from treponemal sources and that are used in the fluorescent treponemal antibody absorption test (FTA-ABS), the Treponema pallidum immobilization test (T.P.I.), and other treponemal tests used to identify antibodies to Treponema pallidum directly from infecting treponemal organisms in serum. The identification aids in the diagnosis of syphilis caused by bacteria belonging to the genus Treponema and provides epidemiological information on syphilis.

## Predicate Devices

- Zeus ELISA Borrelia Vlse-1/pepc10 IgG/IgM Test System ([K113397](/device/K113397.md))

## Submission Summary (Full Text)

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>
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FDA

U.S. FOOD &amp; DRUG

ADMINISTRATION

# 510(k) SUBSTANTIAL EQUIVALENCE DETERMINATION DECISION SUMMARY

ASSAY AND INSTRUMENT

## I Background Information:

A 510(k) Number

K193051

B Applicant

DiaSorin Inc.

C Proprietary and Established Names

LIAISON Lyme Total Antibody Plus, LIAISON Lyme Total Antibody Plus Control Set

D Regulatory Information

|  Product Code(s) | Classification | Regulation Section | Panel  |
| --- | --- | --- | --- |
|  LSR | Class II | 21 CFR 866.3830 - Treponema Pallidum
Treponemal Test Reagents | MI - Microbiology  |
|  QCH | Class II | 21 CFR 866.3920 - Assayed quality control material for clinical microbiology assays | MI - Microbiology  |

## II Submission/Device Overview:

A Purpose for Submission:

To obtain a substantial equivalence determination and FDA clearance for a new device.

B Measurand:

Anti-Borrelia burgdorferi total antibodies

Food and Drug Administration

10903 New Hampshire Avenue

Silver Spring, MD 20993-0002

www.fda.gov

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C Type of Test:

Chemiluminescent immunoassay (CLIA)

## III Intended Use/Indications for Use:

A Intended Use(s):
See Indications for Use below.

B Indication(s) for Use:
LIAISON Lyme Total Antibody Plus

The LIAISON Lyme Total Antibody Plus assay uses chemiluminescent immunoassay (CLIA) technology for the qualitative determination of IgG and IgM antibodies to *Borrelia burgdorferi* in human serum and plasma (K₂-EDTA, Li-heparin) samples. This assay is intended for use on samples from patients with signs and symptoms that are consistent with Lyme disease. Positive or equivocal results should be supplemented by testing with a standardized Western blot procedure. Positive supplemental results provide evidence of exposure to *B. burgdorferi* and can be used to support a clinical diagnosis of Lyme disease. Negative results by LIAISON Lyme Total Antibody Plus assay should not be used to exclude Lyme disease. The test has to be performed on the LIAISON XL Analyzer.

The LIAISON Lyme Total Antibody Plus Control Set

The LIAISON Lyme Total Antibody Plus Control Set is intended for use as assayed quality control samples to monitor the performance of the LIAISON Lyme Total Antibody Plus assay. The performance characteristics of LIAISON Lyme Total Antibody Plus Control Set have not been established for any other assays or instrument platforms different from the LIAISON XL.

C Special Conditions for Use Statement(s):
Rx - For Prescription Use Only

D Special Instrument Requirements:
LIAISON XL Analyzer

## IV Device/System Characteristics:

A Device Description:

The method for qualitative determination of IgG and IgM antibodies to *B. burgdorferi* is an indirect chemiluminescence immunoassay (CLIA). All assay steps (with the exception of magnetic particle resuspension) and incubations are performed by the Analyzer. The principal components of the test are magnetic particles (solid phase) coated with recombinant Borrelia

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antigens and a conjugate reagent containing two mouse monoclonal antibodies (anti-human IgG and anti- human IgM) linked to an isoluminol derivative (isoluminol-antibody conjugate). During the first incubation, anti-Borrelia burgdorferi antibodies present in calibrators, samples or controls bind to the solid phase. During the second incubation, the antibody conjugates react with anti-Borrelia burgdorferi IgG and IgM antibodies that have bound to the solid phase. After each incubation, unbound material is removed with a wash cycle. Subsequently, the starter reagents are added and a flash chemiluminescence reaction is thus induced. The light signal, and hence the amount of isoluminol-antibody conjugate, is measured by a photomultiplier as relative light units (RLU) and is indicative of the presence of  $B$  . burgdorferi antibodies present in calibrators, samples or controls.

## B Principle of Operation:

Chemiluminescence immunoassay (CLIA)

## C Instrument Description Information:

|  Modes of Operation | Yes | No  |
| --- | --- | --- |
|  Does the applicant’s device contain the ability to transmit data to a computer, webserver, or mobile device? | ☐ | ☑  |
|  Does the applicant’s device transmit data to a computer, webserver, or mobile device using wireless transmission? | ☐ | ☑  |
|  Software  |   |   |
|  FDA has reviewed applicant’s Hazard Analysis and software development processes for this line of product types. | ☑ | ☐  |

1. Instrument Name: LIAISON XL Analyzer
2. Specimen Identification: Specimens are identified by barcode and each test parameter is identified via information encoded in the Reagent Integral Radio Frequency Identification transponder (RFID Tag).

Control identification is detected by the bar code label or may be manually programmed into the instrument. Follow the analyzer operator's manual to start the run. Return controls to the refrigerator immediately after each use.

3. Specimen Sampling and Handling: Either human serum, SST serum,  $\mathrm{K}_2$ -EDTA plasma and Lithium Heparin plasma may be used in this assay. Blood should be collected aseptically by venipuncture. Serum samples should be allowed to clot. Centrifuge samples and separate serum or plasma from the clot as soon as possible. Samples having particulate matter, turbidity, lipemia, or erythrocyte debris may require clarification by filtration or centrifugation before testing. Grossly hemolyzed or lipemic samples as well as samples containing particulate matter or exhibiting obvious microbial contamination should not be tested. Check for and remove air bubbles before assaying. Samples are stable at room temperature for up to 8 hours. If the assay is performed within 7 days of sample collection, the samples should be kept at  $2 - 8^{\circ}\mathrm{C}$ ; otherwise they

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should be stored frozen (-20°C or below). If samples are stored frozen, mix thawed samples well before testing. Samples may be frozen-thawed 5 times. Self-defrosting freezers are not recommended for sample storage.

The minimum specimen volume required for a single determination is 155μL.

4. Calibration:

Individual LIAISON Lyme Total Antibody Plus Reagent Integrals contain specific information for calibration of the particular Reagent Integral lot. Test of assay specific calibrators allows the detected relative light units (RLU) values to adjust the assigned master curve. Each calibration solution allows (5) calibrations to be performed.

Recalibration in triplicate is mandatory whenever at least 1 of the following conditions occurs:

- With each new lot of reagents (Reagent Integral or Starter Reagents).
- The previous calibration was performed more than 8 weeks prior.
- Quality Control results are out of the acceptable range.
- The Analyzer has been serviced.

Refer to the analyzer operator's manual for calibration instructions.

Measuring range: The LIAISON Lyme Total Antibody Plus assay measures between 0.01 and 10 Index units.

The lowest reportable value is 0.01 Index unit. Values below 0.01 Index units should be reported as &lt; 0.01 Index units. The highest reportable value without dilution is 10 Index units.

5. Quality Control:

Quality control is required to be performed once per day of use, or according to the guidelines or requirements of local regulations or accredited organizations. It is recommended that the user refer to CLSI C24-A3 and 42 CFR 493.1256 (c) for guidance on appropriate quality control practices.

LIAISON Lyme Total Antibody Plus controls are intended to monitor for substantial reagent failure. Single replicates of LIAISON controls should be run to monitor the assay performance. If control values lie within the expected ranges provided on the certificate of analysis, the test is valid. If control values lie outside the expected ranges, the test is invalid and patient results cannot be reported. Assay calibration should be performed if a control failure is observed and controls and patient specimens must be repeated.

The performance of other controls should be evaluated for compatibility with this assay before they are used. Appropriate value ranges should be established for all quality control materials used.

The range of concentrations of each control is reported on the certificate of analysis and indicates the limits established by DiaSorin for control values that can be obtained in reliable assay runs.

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V Substantial Equivalence Information:

A Predicate Device Name(s):
Zeus ELISA Borrelia Vlse-1/pepc10 IgG/IgM Test System

B Predicate 510(k) Number(s):
K113397

C Comparison with Predicate(s):

|  Device & Predicate Device(s): | K193051 | K113397  |
| --- | --- | --- |
|  Device Trade Name | LIAISON Lyme Total Antibody Plus | Zeus ELISA Borrelia Vlse-1/pepc10 IgG/IgM Test System  |
|  General Device Characteristic Similarities |  |   |
|  Intended Use/Indications For Use | LIAISON Lyme Total Antibody Plus: The LIAISON Lyme Total Antibody Plus assay uses chemiluminescent immunoassay (CLIA) technology for the qualitative determination of IgG and IgM antibodies of Borrelia burgdorferi in human serum and plasma (EDTA, Li-heparin) samples. This assay is intended for use on samples from patients with signs and symptoms that are consistent with Lyme disease. Positive or equivocal results should be supplemented by testing with a standardized Western blot procedure. Positive supplemental results provide evidence of exposure to B. burgdorferi and can be used to support a clinical diagnosis of Lyme disease. Negative results by LIAISON Lyme Total Antibody Plus assay should not be used to exclude Lyme disease. The test has to be performed on the LIAISON XL Analyzer. | Qualitative detection of IgG and IgM class antibodies to VIsE-1 and pepC10 antigens from Borrelia burgdorferi in human serum. The assay is intended for testing serum samples from symptomatic patients or those with a history of Lyme Borreliosis. All positive and equivocal specimens should be tested with a second-tier test such as Western Blot, which if positive, is supportive evidence of infection with B. burgdorferi. Diagnosis of Lyme Borreliosis should be made based on the presence of B. burgdorferi antibodies, history, symptoms, and other laboratory data. Negative first or second tier results should not be used to exclude Borreliosis. This kit is for in vitro diagnostic use.  |

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VI Standards/Guidance Documents Referenced:

N/A

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VII Performance Characteristics (if/when applicable):

A Analytical Performance:

1. Precision/Reproducibility:

Precision: A 12-day precision/repeatability study was conducted at DiaSorin on the LIAISON Lyme Total Antibody Plus assay. Six serum samples and one lot of LIAISON Lyme Total Antibody Plus Controls were tested for 12 days, 2 runs/day, and 2 replicates per run by multiple technologists for a total of 48 replicates. These test days span 2 calibration cycles. CLSI document EP05-A3 was consulted in the preparation of the testing protocol.

Table 1: Precision Study Results
|  Sample ID | N | Mean (Index) | Within Run |   | Between Run |   | Between Day |   | TOTAL  |   |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|   |   |   |  SD | %CV | SD | %CV | SD | %CV | SD | %CV  |
|  Neg. Control | 48 | 0.09 | 0.01 | 9.4 | 0.01 | 8.0 | 0.00 | 0.0 | 0.01 | 11.3  |
|  Pos. Control | 48 | 1.96 | 0.13 | 6.7 | 0.03 | 1.6 | 0.15 | 7.7 | 0.20 | 10.4  |
|  Sample 1 | 48 | 0.09 | 0.00 | 5.6 | 0.01 | 6.0 | 0.00 | 2.2 | 0.01 | 8.5  |
|  Sample 2 | 48 | 0.84 | 0.04 | 4.5 | 0.02 | 2.8 | 0.05 | 5.6 | 0.07 | 7.7  |
|  Sample 3 | 48 | 1.59 | 0.12 | 7.7 | 0.00 | 0.0 | 0.10 | 6.0 | 0.15 | 9.4  |
|  Sample 4 | 48 | 4.51 | 0.21 | 4.7 | 0.24 | 5.4 | 0.25 | 5.5 | 0.41 | 9.0  |
|  Sample 5 | 48 | 0.82 | 0.06 | 7.3 | 0.07 | 8.4 | 0.06 | 7.0 | 0.11 | 13.2  |
|  Sample 6 | 48 | 1.39 | 0.08 | 6.0 | 0.12 | 8.7 | 0.07 | 5.2 | 0.16 | 11.8  |

Reproducibility: A five-day precision/reproducibility study was performed internally at DiaSorin Inc. and at two external U.S. laboratories with one lot of LIAISON Lyme Total Antibody Plus assay. The study was performed for 5 days, 2 runs/day, and 3 replicates/run. Each day, two operators, at each testing site performed the testing for a total of 30 replicates at each site. CLSI document EP15-A3 was consulted in the preparation of the testing protocol.

Table 2: Reproducibility Study Results
|  Sample ID | n | mean | Within Run |   | Between Day |   | Between Run |   | Between Site |   | TOTAL  |   |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|   |   |   |  SD | %CV | SD | %CV | SD | %CV | SD | %CV | SD | %CV  |
|  Neg. Control | 90 | 0.0509 | 0.002 | 4.7 | 0.002 | 3.4 | 0.002 | 3.4 | 0.002 | 4.7 | 0.004 | 8.2  |
|  Pos. Control | 90 | 1.8 | 0.118 | 6.5 | 0.04 | 2.2 | 0.039 | 2.2 | 0.000 | 0.0 | 0.13 | 7.2  |
|  Sample 1 | 90 | 0.0463 | 0.002 | 4.6 | 0.002 | 4.3 | 0.001 | 3.1 | 0.000 | 0.0 | 0.003 | 7.0  |
|  Sample 2 | 90 | 0.654 | 0.028 | 4.2 | 0.036 | 5.5 | 0.026 | 3.9 | 0.024 | 3.7 | 0.057 | 8.8  |
|  Sample 3 | 90 | 1.55 | 0.07 | 4.5 | 0.055 | 3.6 | 0.046 | 3.0 | 0.077 | 5.0 | 0.126 | 8.2  |
|  Sample 4 | 90 | 4.66 | 0.207 | 4.4 | 0.161 | 3.5 | 0.107 | 2.3 | 0.000 | 0.0 | 0.283 | 6.1  |
|  Sample 5 | 90 | 0.86 | 0.052 | 6.1 | 0.04 | 4.6 | 0.000 | 0.0 | 0.035 | 4.1 | 0.074 | 8.7  |
|  Sample 6 | 90 | 1.42 | 0.065 | 4.6 | 0.075 | 5.3 | 0.041 | 2.9 | 0.064 | 4.5 | 0.125 | 8.8  |

2. Linearity: N/A

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# 3. Analytical Specificity/Interference:

Cross-Reactivity Study: The cross-reactivity study evaluated 238 specimens from twenty-four disease states either known to contain potentially cross-reactive antibodies to  $B$ . burgdorferi or from patients with diagnoses that can exhibit signs and symptoms similar to late manifestations of Lyme disease and cause false positive results.

Table 3: Lyme Total Antibody Plus Cross-Reactivity

|  Organism Infected or Disease State | Samples Tested (n) | Pos. or Eqv.  |
| --- | --- | --- |
|  Tick Borne Diseases |  |   |
|  Babesiosis | 10 | 4  |
|  Tick Borne Relapsing Fever (TBRF) | 8 | 2  |
|  Autoimmune Disorders |  |   |
|  Anti-Nuclear Antibodies (ANA) | 10 | 0  |
|  Multiple Sclerosis | 10 | 0  |
|  Sjogrens Syndrome | 10 | 1  |
|  Viral Diseases |  |   |
|  Cytomegalovirus (CMV) IgM | 10 | 0  |
|  Cytomegalovirus (CMV) IgG | 10 | 0  |
|  Epstein-Barr Virus (EBV) VCA, and/or heterophile Ab IgM | 10 | 0  |
|  Epstein-Barr Virus (EBV) VCA, NA-1 and/or EA-D IgG | 10 | 0  |
|  Epstein-Barr Virus (EBV) EBNA IgG | 10 | 1  |
|  Epstein-Barr Virus (EBV) VCA IgM | 10 | 2  |
|  Epstein-Barr Virus (EBV) VCA IgG | 10 | 0  |
|  Human Immunodeficiency Virus (HIV) | 10 | 0  |
|  Influenza Virus | 10 | 0  |
|  Parvovirus | 10 | 3  |
|  Bacterial Diseases |  |   |
|  E. coli | 10 | 0  |
|  H. pylori | 10 | 0  |
|  Syphilis | 10 | 0  |
|  Rheumatic Diseases |  |   |
|  Fibromyalgia | 10 | 0  |
|  Rheumatoid Arthritis | 10 | 0  |
|  Rheumatoid Factor | 10 | 0  |
|  Systemic Lupus Erythematosus (SLE) | 10 | 0  |
|  Additional Markers |  |   |
|  Chronic Fatigue Syndrome | 10 | 0  |
|  Human Anti-mouse Antibodies (HAMA) | 10 | 0  |
|  Total | 238 | 13  |

Interfering Substances: Controlled studies of potentially interfering substances from endogenous interferents spiked into equivocal  $B$ . burgdorferi serum specimens showed that assay performance was not affected at the concentration for each substance listed below. The testing was based on CLSI-EP7-A3.

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Table 4: Endogenous Interferents Study

|  Substance | Concentration  |
| --- | --- |
|  Hemoglobin | 1000 mg/dL  |
|  Triglycerides | 1500 mg/dL  |
|  Bilirubin | 40 mg/dL  |
|  Total protein | 12 g/dL  |
|  Cholesterol | 500 mg/dL  |
|  Biotin | 3600 ng/mL  |

4. Assay Reportable Range: N/A
5. Traceability, Stability, Expected Values (Controls, Calibrators, or Methods): N/A
6. Detection Limit: N/A
7. Assay Cut-Off:

The cut-off for the LIAISON Lyme Total Antibody Plus assay was determined by evaluating U.S. sourced characterized samples from Lyme disease patients and routine clinical samples sent to the laboratory for Lyme disease serology testing. Based on available clinical and laboratory data and by comparison with other cleared serology assays, the samples were classified as expected positive or negative for B. burgdorferi antibodies and evaluated with the LIAISON Lyme Total Antibody Plus assay. An Index of 1.0 was determined to provide the best balance of sensitivity and specificity for the tested samples. An equivocal zone of 0.90 -1.10 was applied to the assay to account for normal measurement imprecision.

8. Accuracy (Instrument): N/A
9. Carry-Over: N/A

B Comparison Studies:

1. Method Comparison with Predicate Device:

Prospective Study: 1,550 samples collected from subjects sent for Lyme disease testing, were de-identified and tested. The collection consisted of subjects from five geographical regions of the U.S. The samples were tested with the LIAISON Lyme Total Antibody Plus assay on the LIASON XL and performed in three laboratories (two external and one internal at DiaSorin). Results were evaluated for first-tier testing.

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Table 5: First-Tier Percent Agreement with Predicate Device

|   | Predicate Assay (IgG/IgM)  |   |   |   |
| --- | --- | --- | --- | --- |
|  LIAISON Lyme Total Antibody Plus | Positive | Equivocal | Negative | Total  |
|  Positive | 62 | 1 | 9 | 72  |
|  Equivocal | 2 | 0 | 10 | 12  |
|  Negative | 42 | 8 | 1416 | 1466  |
|  Total | 106 | 9 | 1435 | 1550  |

Positive % Agreement*: 56.5% (65/115) 95% CI: 47.4% - 65.2%

Negative % Agreement: 98.7% (1416/1435) 95% CI: 97.9% - 99.2%

*Includes Positive and Equivocal combined

Western blot testing was performed on the samples positive or equivocal by the test device and the predicate. The following results were obtained:

Table 6: Second-Tier Testing

|  Test System | Tier 1+ or Eqv. | Western Blot IgG/IgM + | Western Blot IgG/IgM -  |
| --- | --- | --- | --- |
|  LIAISON Lyme Total Antibody Plus | 84 | 48 | 36  |
|  Predicate Assay | 115 | 48 | 67  |
|  Predicate and LIAISON Lyme Total Antibody Plus | 65 | 47 | 18  |

Agreement results:

2nd-Tier Positive % Agreement: 97.9% (47/48); 95% CI: 89.1%-99.6%

Analytical Specificity: The LIAISON Lyme Total Antibody Plus assay was used to test 300 samples from apparently healthy individuals in the U.S. This population was 55.3% female, 44.7% male with a mean age of 59 years. Fifty percent of the samples were collected in a Lyme disease endemic region and 50% were collected from a Lyme disease non-endemic region.

Table 7: Analytical Specificity Study

|  Population | N | % Positivity  |
| --- | --- | --- |
|  Endemic | 150 | 2  |
|  Non-Endemic | 150 | 19.3*  |
|  All Specimens | 300 | 10.7  |

*27/29 were confirmed positive by Western blot testing and 28/29 with the predicate first-tier assay.

Characterized Lyme Panel Testing: Two hundred eighty samples were acquired from the CDC and evaluated internally at the manufacturer's site. The results of the testing are presented here as a means of conveying further information on the performance of the

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LIAISON Lyme Total Antibody Plus assay with a characterized serum panel. This does not imply an endorsement of the assay by the CDC.

Table 8: Testing of CDC Lyme Reference Sera

|  Sample Category (CDC Reference Classification) |  |   |   |   |   |   | N | LIAISON Lyme Total Antibody Plus % Agreement/ 95% Wilson CI | Predicate % Agreement/ 95% Wilson CI  |   |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|   |   |  Candidate |   |   | Predicate  |   |   |   |   |   |
|   |   |  Pos. | Neg. | Eqv. | Pos. | Neg. |   |   |   | Eqv.  |
|  Stage I | Acute | 27 | 9 | 3 | 30 | 9 | 0 | 39 | 76.9% (30/39) 61.7% - 87.4% | 76.9% (30/39) 61.7% - 87.4%  |
|  Stage II | Convalescent | 29 | 2 | 0 | 29 | 2 | 0 | 31 | 93.5% (29/31) 79.3% - 98.2% | 93.5% (29/31) 79.3% - 98.2%  |
|  Stage III | Late | 20 | 0 | 0 | 20 | 0 | 0 | 20 | 100.0% (20/20) 83.9% - 100.0% | 100.0% (20/20) 83.9% - 100.0%  |
|  Look-alike Diseases |   | 2 | 86 | 2 | 4 | 85 | 1 | 90 | 95.6% (86/90) 89.1% - 98.3% | 94.4% (85/90) 87.6% - 97.6%  |
|  Healthy Controls |   | 2 | 98 | 0 | 3 | 95 | 2 | 100 | 98.0% (98/100) 93.0% - 99.4% | 95.0% (95/100) 88.8% - 97.8%  |

2. Matrix Comparison:

Matrix Equivalence Study: Thirty-two matched patient sets of serum, SST serum, K₂-EDTA plasma and lithium heparin plasma samples were tested to determine if these sample types provide equivalent results. Sample regression analysis was done by Passing and Bablok method. All sample types met acceptance criteria for use in the LIAISON Lyme Total Antibody Plus assay. A summary of the results is shown in the following table.

Table 9: Sample Equivalence Results

|  Comparison to Serum | Bias | CI: 95%  |
| --- | --- | --- |
|  SST Serum Constant | 0.00 | 0.01 0.01  |
|  SST Serum Proportional | 0.99 | 0.97 1.01  |
|  K₂-EDTA Constant | -0.01 | 0.03 0.01  |
|  K₂-EDTA Proportional | 0.99 | 0.95 1.01  |
|  Lithium Heparin Constant | 0.01 | 0.02 0.01  |
|  Lithium Heparin Proportional | 0.95 | 0.92 0.97  |

C Clinical Studies:

1. Clinical Sensitivity: N/A
2. Clinical Specificity: N/A

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3. Other Clinical Supportive Data (When 1. and 2. Are Not Applicable): N/A

D Clinical Cut-Off: N/A

E Expected Values/Reference Range:

Internal and external investigators assessed the device's performance with 1550 masked specimens prospectively collected from patients between the ages of 4 and 103 that were submitted for Borrelia antibody testing. Specimens were acquired from five distinct geographical regions within the U.S. The specimens were randomly distributed among three testing sites, one of which was the manufacturer's research facility for testing. The device's performance was also assessed at the manufacturer's research facility with specimens from an asymptomatic population obtained from both endemic and non-endemic regions. Available subject demographics, quantity of specimens tested and number of specimens which tested positive or equivocal for each population are summarized in Table 10.

Table 10: LIAISON XL Lyme Total Antibody Plus Testing Results

|  Populations | Number Tested | Gender |   | Age Range | Positive/Tested  |
| --- | --- | --- | --- | --- | --- |
|   |   |  Male | Female  |   |   |
|  Prospective | 1550 | 641 | 909 | 4 - 103 | 84/1550  |
|  Endemic | 150 | 49 | 101 | 18 - 87 | 3/150  |
|  Non-Endemic | 150 | 85 | 65 | 16 - 99 | 29/150*  |

*27/29 were confirmed positive by Western blot testing and 28/29 with the predicate first-tier assay.

F Other Supportive Instrument Performance Characteristics Data: N/A

VIII Proposed Labeling:

The labeling supports the finding of substantial equivalence for this device.

IX Conclusion:

The submitted information in this premarket notification is complete and supports a substantial equivalence decision.

K193051 - Page 12 of 12

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**Source:** [https://fda.innolitics.com/submissions/MI/subpart-d%E2%80%94serological-reagents/LSR/K193051](https://fda.innolitics.com/submissions/MI/subpart-d%E2%80%94serological-reagents/LSR/K193051)

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