SPECTROLYSE PAI-1, MODEL 101201
Device Facts
| Record ID | K063323 |
|---|---|
| Device Name | SPECTROLYSE PAI-1, MODEL 101201 |
| Applicant | American Diagnostica, Inc. |
| Product Code | GGP · Hematology |
| Decision Date | Aug 15, 2007 |
| Decision | SESE |
| Submission Type | Traditional |
| Regulation | 21 CFR 864.7290 |
| Device Class | Class 2 |
Indications for Use
The quantitative determination of Plasminogen Activator Inhibitor Type-1 (PAI-1) activity in human plasma. The test is for in vitro diagnostic use and is not intended for internal use in humans and animals.
Device Story
Spectrolyse® PAI-1 is an indirect chromogenic assay for measuring PAI-1 activity in citrated human plasma. The assay utilizes a microwell plate format; reagents include tPA, tPA/PAI-1 depleted plasma, stop reagent, and buffers. Principle: patient plasma incubated with tPA; acetate buffer destroys interfering alpha-2-antiplasmin; residual tPA activity catalyzes conversion of plasminogen to plasmin; plasmin hydrolyzes chromogenic substrate. Color development is inversely proportional to PAI-1 activity. Used in clinical laboratory settings by trained personnel. Results assist in assessing PAI-1 activity levels in patient plasma samples.
Clinical Evidence
Bench testing only. Two method comparison studies (N=34 each) compared Spectrolyse PAI-1 to the predicate device, showing positive correlation (R=0.953 and 0.955). Precision studies evaluated intra-assay and inter-assay variability across two lots using three control samples; intra-assay CV% ranged from 2.0% to 14.4%, and inter-assay CV% ranged from 3.9% to 12.9%.
Technological Characteristics
Two-stage colorimetric assay; utilizes tPA, plasminogen, and SPECTROZYME PL chromogenic substrate. Quantitative measurement based on residual tPA activity. In vitro diagnostic reagent kit.
Indications for Use
Indicated for the quantitative determination of PAI-1 activity in human plasma for clinical laboratory use.
Predicate Devices
- Spectrolyse/pL PAI (K922782)
Related Devices
- K971519 — ASSERACHROM TPA TEST KIT · American Bioproducts Co. · Aug 19, 1997
- K013168 — IMUBIND PLASMA PAI-1 ELISA,MODEL 822 · American Diagnostica, Inc. · Mar 7, 2002
- K981696 — IL TEST PLASMIN INHIBITOR · Instrumentation Laboratory CO · Aug 27, 1998
- K981200 — IL TEST PLASMINOGEN · Instrumentation Laboratory CO · May 26, 1998
Submission Summary (Full Text)
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510(k) SUBSTANTIAL EQUIVALENCE DETERMINATION
DECISION SUMMARY
DEVICE ONLY TEMPLATE
A. 510(k) Number:
K063323
B. Purpose for Submission:
Clearance of a new device
C. Analyte:
Plasminogen Activator Inhibitor Type-1 (PAI-1)
D. Type of Test:
Indirect chromogenic assay
E. Applicant:
American Diagnostica
F. Proprietary and Established Names:
Spectrolyse® PAI-1
G. Regulatory Information:
1. Regulation section:
21 CFR 864.7290, Factor Deficiency Test
2. Classification:
Class II
3. Product Code:
GGP
4. Panel:
81 Hematology
H. Intended Use:
1. Intended use(s):
The quantitative determination of Plasminogen Activator Inhibitor Type-1 (PAI-1) activity in human plasma. The test is for in vitro diagnostic use and is not intended for internal use in humans and animals.
2. Indication(s) for use:
3. Special condition for use statement(s):
4. Special instrument Requirements:
I. Device Description:
The American Diagnostica Plasminogen Activator Inhibitor Type-1 (PAI-1) kit consists of Plasminogen Activator Reagent (PAR), tPA, tPA/PAI-1 depleted plasma, a stop reagent, and buffers. The kit contains enough reagents for 60 assays using a microwell plate (not provided).
J. Substantial Equivalence Information:
1. Predicate device name(s):
BioPool Spectrolyse®/pL PAI
2. Predicate K number(s):
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K922782
3. Comparison with predicate:
| Similarities | | |
| --- | --- | --- |
| Item | Device | Predicate |
| Intended Use | For the quantitative determination of plasminogen activator inhibitor Type-1 (PAI-1) | Same |
| Sample Requirements | Citrated plasma | Same |
| Differences | | |
| Item | Device | Predicate |
K. Standard/Guidance Document Referenced (if applicable):
NCCLS/CLSI Guideline C28-A, How to define and Determine Reference Intervals in the Clinical Laboratory
NCCLS/CLSI EP5-A2, Evaluation of Precision Performance of Quantitative Measurement Methods, Approved Guideline- Second Edition
NCCLS/CLSI Guideline EP6-A, Evaluation of the Linearity of Quantitative Measurement Procedures
NCCLS/CLSI EP17-A, Protocols for Determination of Limits of Detection and Limits of Quantitation
L. Test Principle:
Patient plasma samples are diluted and incubated with tPA solution to allow for the tPA and PAI-1 in the sample to react. Acetate buffer is added to the sample to destroy $\alpha$-2-antiplasmin which would interfere with the assay. Next, the samples are incubated with a chromogenic substrate for plasmin (PAR), so that residual tPA activity in the sample catalyzes the conversion of plasminogen to plasmin, which in turn hydrolyzes the chromogenic substrate. The amount of color developed in inversely proportional to the amount of PAI-1 activity in the sample.
M. Performance Characteristics (if/when applicable):
1. Analytical performance:
a. Precision/Reproducibility:
Intra and inter-assay variability with 3 control samples. In Study 1, three PAI-1 controls were assayed 4 times per run for 20 total runs. In study 2, 3 PAI-1 levels were assayed 4 times per run for 5 total runs. Two lots were tested.
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Study 1 – Lot #050727 Control set 1613027
| PAI (u/mL) | N | Intra - (% CV) | Inter- (% CV) |
| --- | --- | --- | --- |
| 10.4 | 40 | 3.6 | 12.9 |
| 13.8 | 40 | 3.4 | 7.5 |
| 22.2 | 40 | 2.4 | 3.9 |
Study 2 – Lot #060720 Control Set 161030
| PAI (u/mL) | N | Intra - (% CV) | Inter- (% CV) |
| --- | --- | --- | --- |
| 6.7 | 40 | 14.4 | 10.2 |
| 14.4 | 40 | 3.5 | 5.7 |
| 26.0 | 40 | 2.0 | 4.1 |
b. Linearity/assay reportable range:
Five samples of known PAI concentrations were prepared from samples of known PAI concentrations. Low (0 U/ml), mid low (10, U/ml), mid high (30 U/ml), and high (40 U/ml) samples were run using the Spectrolyse® PAI-1 assay in replicates of four. A least squares regression line was fit to the PAI-1 U/mL (Y) vs theoretical concentrations of PAI-1 samples (X) data. $y = 0.998x + 1.1$ , $r = 0.998$ .
c. Traceability (controls, calibrators, or method): The PAI 0 standard is calibrated against a Primary Standard according to SOP CHRO21 A, Determining the Activity of tPA Standard.
d. Detection limit: The 0 Standard and a patient sample known to have a result between 0 and 10 PAI, was assayed 20 times. Results U/mL. were analyzed according to the recommendations in NCCLS guideline EP17-A, and the LoB was calculated to be $2.6\mathrm{U / mL}$ , and the LoD was calculated to be 4.6
e. Analytical specificity:
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Seven patient samples (untreated with antibody) were assayed in duplicated using ADI Spectrolyse® PAI-1 assay. Each patient sample was mixed with an anti-PAI antibody or with an anti-FVIII antibody negative control antibody. Results demonstrated that PAI-1 levels were essentially the same in untreated samples and samples treated with control antibody. Samples treated with anti-PAI-1 antibody had significantly reduced PAI-1 levels.
f. Assay cut-off:
2. Comparison studies:
a. A. Method comparison with predicate device:
Spectrolyse® PAI-1 method comparison studies were performed at American Diagnostica, Inc. in Stamford, CT (study1) and at Loyola University Medical Center, Chicago, IL (Study 2). Patient samples were tested using two lots of Spectrolyse® PAI-1 assay.
| | N | Regression Equation | R | Syx (ng/ml) | Sample Range |
| --- | --- | --- | --- | --- | --- |
| Site 1 | 34 | y=1.0787x - 4.76 | 0.953 | 3.31 | 5.3-37.8 |
| Site 2 | 34 | y = 1.0179x + 3.75 | 0.955 | 2.65 | 5.0-42.3 |
b. Matrix comparison:
3. Clinical studies:
a. Clinical sensitivity:
b. Clinical specificity:
c. Other clinical supportive data (when a and b are not applicable):
4. Clinical cut-off:
5. Expected values/Reference range:
104 Plasma samples (n=57, n=47) were assayed and analyzed according to the recommendations in NCCLS guideline C28-A.
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| Number of Donors | Median U/ml PAI | Mean U/ml | SD | PAI reference interval (95 percentile) |
| --- | --- | --- | --- | --- |
| Total (104) | 7 | 9.7 | 9.0 | <26.7 |
| Male (57) | 9.7 | 11.9 | 9.3 | <26.8 |
| Female (47) | 7.1 | 4.4 | 7.9 | <26.2 |
# N. Conclusion:
The submitted information in this premarket notification is complete and supports a substantial equivalence decision.
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