(208 days)
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No
The summary describes a standard in vitro diagnostic test using a bead-based system for genotyping. There is no mention of AI, ML, or any computational analysis beyond interpreting pre-defined outcome specifications based on the bead signals.
No
This device is an in vitro diagnostic device used to detect and genotype certain point mutations, primarily aiding in the diagnosis of thrombophilia, not directly treating a condition.
Yes
The "Intended Use / Indications for Use" section explicitly states that the device is "an in vitro diagnostic device" and "is indicated for use as an aid to diagnosis in the evaluation of patients with suspected thrombophilia."
No
The device description explicitly lists numerous physical reagents and components (e.g., MTR1, AB1, AOP1, ELM, FSB, UB3 buffer, AE1 reagent, MSS reagent, Fast Start Taq DNA Polymerase, VW2 buffer, VeraCode FV/FII Bead Plate, magnet plate) which are essential for the device's function as an in vitro diagnostic test. While it includes software components (kit manifest file, sample sheet files), it is not solely software.
Yes, this device is an IVD (In Vitro Diagnostic).
Here's why:
- Intended Use/Indications for Use: The very first sentence explicitly states: "The VeraCode Genotyping Test for Factor V and Factor II is an in vitro diagnostic device..." It also describes its use for detecting mutations in DNA obtained from human blood samples, which is a classic characteristic of an in vitro diagnostic test.
- Device Description: The description details reagents and components used to perform a test on biological samples (DNA from blood).
- Summary of Performance Studies: The performance studies involve testing human patient samples and comparing the results to a reference method (bi-directional DNA sequencing), which is typical for validating an IVD.
- Key Metrics: The reported metrics (Percent Agreement, LCB) are standard for evaluating the performance of diagnostic tests.
- Predicate Device(s): The mention of a predicate device (AutoGenomics INFINITI System for Factor II and Factor V) further confirms its classification as a medical device, specifically an IVD, as predicate devices are used for demonstrating substantial equivalence in regulatory submissions for IVDs.
N/A
Intended Use / Indications for Use
The VeraCode Genotyping Test for Factor V and Factor II is an in vitro diagnostic device for the detection and genotyping of Factor V Leiden G1691A and Factor II (Prothrombin) G20210A point mutations in DNA obtained from EDTA-anticoagulated human blood samples. The test is intended for use on the BeadXpress System. The VeraCode Genotyping Test for Factor V and Factor II on the BeadXpress System is indicated for use as an aid to diagnosis in the evaluation of patients with suspected thrombophilia.
Product codes (comma separated list FDA assigned to the subject device)
NPR, NPO
Device Description
The VeraCode Genotyping Test for Factor V and Factor II assay consists of reagents sufficient for 96 tests, consisting of two boxes containing pre-PCR and post-PCR reagents. The pre-PCR box contains the following reagents: MTR1 (1 x 1.2 mL). AB1 (1 x 4 mL), AOP1 (1 x 4.8 mL), ELM (1 x 4.8 mL), FSB (1 x 4.8mL), UB3 buffer (2 x 4.8 mL) and AE1 reagent (2 x 4.8 mL). The post-PCR box contains MSS reagent (1 x 4.8 mL) and Fast Start Taq DNA Polymerase (1 x 60 µL), VW2 buffer (1 x 60 mL), a VeraCode FV/FII Bead Plate with holographically inscribed glass microbeads aliquoted in strip-well plates, a test-specific kit manifest file and sample sheet files (containing test specific outcome specifications and sample plate layout files used to interpret and report genotype results). A magnet plate is also required but sold separately.
Mentions image processing
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Mentions AI, DNN, or ML
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Input Imaging Modality
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Anatomical Site
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Indicated Patient Age Range
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Intended User / Care Setting
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Description of the training set, sample size, data source, and annotation protocol
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Description of the test set, sample size, data source, and annotation protocol
A panel of 15 genomic DNA samples isolated from blood and consisting of 3 independent samples for each of the 5 possible genotypes (including Wild Type), were distributed to each of the three sites. At each site, two operators tested each sample in duplicate once a day for 5 non-consecutive days. Samples yielding invalid results were retested once and no incorrect calls were observed when the results were compared to bi-directional sequencing.
Accuracy was measured as overall percent agreement of the genotyping results produced by the VeraCode Genotyping Test for Factor V and Factor II as compared to those resulting from bi-directional DNA sequencing. Ninety-two patient samples were accrued at each of the three sites, yielding a total of 276 patient samples, from pre-selected or unscreened patients undergoing Factor V testing and each site was provided with two archived DNA samples to serve as positive controls. The samples were then analyzed using the VeraCode and compared to bi-directional sequencing analysis performed at an independent reference laboratory. All genomic DNA samples were extracted from EDTA anti-coagulated whole blood samples.
Summary of Performance Studies (study type, sample size, AUC, MRMC, standalone performance, key results)
Analytical Performance - Precision/Reproducibility: A panel of 15 genomic DNA samples isolated from blood (3 independent samples for each of the 5 possible genotypes, including Wild Type) was tested. Three sites, with two operators each, tested samples in duplicate once a day for 5 non-consecutive days. Results were compared to bi-directional sequencing.
Key results (before repeat testing):
- Factor V:
- Wild Type: 98.3% Agreement, 97.0% 95% LCB (for Site 1), up to 98.3% Agreement overall (before repeat).
- Heterozygous: 98.8% Agreement, 96.8% 95% LCB (for Site 1), up to 98.8% Agreement overall (before repeat).
- Homozygous: 97.8% Agreement, 97.8% 95% LCB (for Site 1), up to 97.8% Agreement overall (before repeat).
- Factor II:
- Wild Type: 98.9% Agreement, 97.8% 95% LCB.
- Heterozygous: 99.4% Agreement, 97.4% 95% LCB.
- Homozygous: 97.2% Agreement, 94.3% 95% LCB.
After repeat testing, many categories reached 100% agreement.
Lot-to-Lot Reproducibility: Three kit lots were tested by running five partial plates on a single BeadXpress Reader by a single operator over the course of five nonconsecutive days. Six gDNA samples (commercially available cultured cells) representing each possible genotype were used. No sample failures were noted for two of the three lots, and one sample of the third lot generated an invalid (no call) result.
Detection limit: Analytical sensitivity was established using Factor V and Factor II wild type, heterozygous and homozygous variant gDNA samples. DNA input ranged from 1 – 1,000 ng per sample. 5 ng, 10 ng, 25 ng, 500 ng, and 1000 ng met preliminary passing criteria (all replicates produced correct results compared to bi-directional sequencing). 25 ng and 500 ng were selected as the preliminary DNA input claim.
Analytical specificity: Heparin concentrations (100 U/dL, 300 U/dL, and 900 U/dL) and endogenous interfering substances (bilirubin at 684 umol/L, cholesterol at 13 mmol/L, hemoglobin at 2 g/L) were spiked into blood samples. No adverse effects on assay performance were observed. The claimed genotypes for these DNA samples were confirmed by bidirectional sequencing.
Comparison Studies - Method comparison with predicate device: Accuracy was compared to bi-directional DNA sequencing. 276 patient samples were analyzed.
Key results (Before Repeat Testing):
- Factor V:
- Wild Type: 213 samples, 100% Agreement, 89.6% 95% LCB.
- Heterozygous: 49 samples, 93.88% Agreement, 84.93% 95% LCB.
- Homozygous: 14 samples, 92.86% Agreement, 70.33% 95% LCB.
- Factor II:
- Wild Type: 245 samples, 99.6% Agreement, 98.08% 95% LCB.
- Heterozygous: 24 samples, 95.83% Agreement, 81.71% 95% LCB.
- Homozygous: 7 samples, 100% Agreement, 65.18% 95% LCB.
After repeat testing, Factor V Heterozygous and Factor II Heterozygous/Homozygous reached 100% agreement. Factor V Homozygous remained at 92.86% agreement.
Key Metrics (Sensitivity, Specificity, PPV, NPV, etc.)
Agreement (against bi-directional sequencing) and 95% Lower Confidence Bound (LCB) are provided.
For Factor V (before repeat testing): Wild Type (100%), Heterozygous (93.88%), Homozygous (92.86%).
For Factor II (before repeat testing): Wild Type (99.6%), Heterozygous (95.83%), Homozygous (100%).
After repeat testing, typically higher agreement rates were achieved due to resolving initial "no calls."
Reproducibility results also include % Agreement, ranging from 97.2% to 100% depending on the genotype and factor.
Predicate Device(s): If the device was cleared using the 510(k) pathway, identify the Predicate Device(s) K/DEN number used to claim substantial equivalence and list them here in a comma separated list exactly as they appear in the text. List the primary predicate first in the list.
Reference Device(s): Identify the Reference Device(s) K/DEN number and list them here in a comma separated list exactly as they appear in the text.
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Predetermined Change Control Plan (PCCP) - All Relevant Information for the subject device only (e.g. presence / absence, what scope was granted / cleared under the PCCP, any restrictions, etc).
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§ 864.7280 Factor V Leiden DNA mutation detection systems.
(a)
Identification. Factor V Leiden deoxyribonucleic acid (DNA) mutation detection systems are devices that consist of different reagents and instruments which include polymerase chain reaction (PCR) primers, hybridization matrices, thermal cyclers, imagers, and software packages. The detection of the Factor V Leiden mutation aids in the diagnosis of patients with suspected thrombophilia.(b)
Classification. Class II (special controls). The special control is FDA's guidance entitled “Class II Special Controls Guidance Document: Factor V Leiden DNA Mutation Detection Systems.” (See § 864.1(d) for the availability of this guidance document.)
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510(k) SUBSTANTIAL EQUIVALENCE DETERMINATION DECISION SUMMARY
A. 510(k) Number: K093129
- B. Purpose for Submission: New Device
- C. Measurand:
Factor II Prothrombin and Factor V Leiden genes in human blood specimens
- D. Type of Test: DNA Genotyping test
E. Applicant:
Illumina, Inc.
F. Proprietary and Established Names: Illumina VeraCode® Genotyping Test for Factor V and Factor II
G. Regulatory Information:
-
- Regulation section:
21 CFR 864.7280; Factor V Leiden DNA mutation detection systems
- Regulation section:
-
Classification: 2.
-
Class II
-
- Product code:
NPR; Test, Factor II G20210A Mutations, Genomic DNA PCR NPO: Test, Factor V Leiden Mutations, Genomic DNA PCR
-
- Panel:
Hematology (81)
- Panel:
H. Intended Use: 1. Intended use(s):
The VeraCode Genotyping Test for Factor V and Factor II is an in vitro diagnostic device for the detection and genotyping of Factor V Leiden G1691A and Factor II (Prothrombin) G20210A point mutations in DNA obtained from EDTA-anticoagulated human blood samples. The test is intended for use on the BeadXpress System. The VeraCode Genotyping Test for Factor V and Factor II on the BeadXpress System is indicated for use as an aid to diagnosis in the evaluation of patients with suspected thrombophilia.
-
- Indication(s) for use: Same as Intended Use.
-
- Special conditions for use statement(s): Prescription use only.
- Special instrument requirements: 4. BeadXpress® System (K093128), VeraScan software v. 2.0.17
I. Device Description:
The VeraCode Genotyping Test for Factor V and Factor II assay consists of reagents sufficient for 96 tests, consisting of two boxes containing pre-PCR and post-PCR reagents. The pre-PCR box contains the following reagents: MTR1 (1 x 1.2 mL). AB1 (1 x 4 mL), AOP1 (1 x 4.8 mL), ELM (1 x 4.8 mL), FSB (1 x 4.8mL), UB3 buffer (2 x 4.8 mL) and AE1 reagent (2 x 4.8 mL). The post-PCR box contains MSS
1
reagent (1 x 4.8 mL) and Fast Start Taq DNA Polymerase (1 x 60 µL), VW2 buffer (1 x 60 mL), a VeraCode FV/FII Bead Plate with holographically inscribed glass microbeads aliquoted in strip-well plates, a test-specific kit manifest file and sample sheet files (containing test specific outcome specifications and sample plate layout files used to interpret and report genotype results). A magnet plate is also required but sold separately.
J. Substantial Equivalence Information:
-
- Predicate device name(s):
- AutoGenomics INFINITI System for Factor II and Factor V
-
- Predicate K number(s): K060564
-
- Comparison with predicate:
| Similarities | ||
|---|---|---|
| Item | Device | Predicate |
| Intended Use/ | ||
| Indications for Use | The VeraCode Genotyping Test for Factor V and Factor II is an in vitro diagnostic for the detection and genotyping of Factor V Leiden G1691A and Factor II (Prothrombin) G20210A point mutations in DNA obtained from EDTA anti-coagulated human blood samples. The test is intended for use on the BeadXpress System. The VeraCode Genotyping Test for Factor V and Factor II on the BeadXpress System is indicated for use as an aid to diagnosis in the evaluation of patients with suspected thrombophilia. | Same |
| Specimen type | Genomic DNA (gDNA) isolated from EDTA human whole blood | Same |
| Sample preparation | DNA extraction and purification performed off-line. | Same |
| Reference method | Bi-directional sequencing | Same |
| No. of mutations/ | ||
| variants detected | 2, Factor II (Prothrombin) G20210A and Factor V Leiden G1691A | Same |
| Assay result output | Assay results interpreted by a software program and assigned a genotype presented to the end user in a report format | Same |
| Illumina VeraCode® Genotyping Test | ||
| for Factor V and Factor II | AutoGenomics | |
| INFINITI System | ||
| for Factor II and | ||
| Factor V |
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| Differences | ||
|---|---|---|
| Item | Device | Predicate |
| Instrumentation | BeadXpress® System and | |
| VeraScan software v. 2.0.17 | INFINITI System | |
| Technology | Microbead array | Biofilm chip microarray |
| Detection Chemistry | Isolation of DNA from human | |
| blood sample, allele-specific | ||
| primer extension and ligation, | ||
| PCR amplification of the | ||
| ligated primers, hybridization | ||
| of the amplified product, and | ||
| signal detection using | ||
| fluorescence | Isolation of DNA from | |
| human blood sample, PCR | ||
| amplification of the | ||
| purified DNA, allele- | ||
| specific primer extension, | ||
| hybridization of the | ||
| extended product, and | ||
| signal detection using | ||
| fluorescence | ||
| Input gDNA amount | 2 µL (25 ng/µL) | 5 µL (5-100 ng/µL) |
K. Standard/Guidance Document Referenced (if applicable):
- CLSI EP5-A2, Evaluation of Precision Performance of Quantitative Measurement Methods; Approved Guideline - Second Edition
- CLSI EP7-A, Interference Testing in Clinical Chemistry; Approved Guideline 2nd Edition
- CLSI EP17-A, Protocols for Determination of Limits of Detection and Limits of Quantitation
- FDA Class II Special Controls Guidance, Factor V Leiden DNA Mutation Detection Systems
L. Test Principle:
The VeraCode Genotyping Test for Factor V and Factor II kit is an in vitro diagnostic device for mutation detection and genotyping of two mutations in two different genes related to increased risk for deep vein thrombosis, Factor V Leiden G1691A and Factor II (Prothrombin) G20210A point mutations in DNA obtained from EDTAanticoagulated human blood. The VeraCode Genotyping Test for Factor V and Factor II utilizes polymerase chain reaction (PCR) primers, hybridization matrices, controls, holographically inscribed glass microbeads (VeraCode Microbead Plates) and assay-specific kit manifest files supplied with the reagent kit. The kit is run with processing reagents, general laboratory instrumentation and the Illumina BeadXpress Svstem.
Genomic DNA is extracted from EDTA-anticoagulated whole blood. The assay uses allele-specific primer extension and ligation to detect sequence variants, followed by PCR amplification with fluorescent primers, hybridization to VeraCode beads, and collection of fluorescence data using the BeadXpress Reader.
The VeraCode Microbead Plates are assay specific, with each distinct holographic digitally coded microbead coated with a capture molecule. The BeadXpress® System is a fluidic microbead reader with VeraScan software for detection and genotyping multiple genes in a purified DNA sample. The BeadXpress includes a dual-color
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laser detection system that enables optical scanning of multiplexed assays developed using the VeraCode digital microbead technology and VeraScan software.
The BeadXpress System includes red and green lasers for detecting and recording information from individual VeraCode assays (VeraCode Microbead Plates) loaded onto the BeadXpress Reader tray. After test samples are captured by the microbeads, fluorescently labeled reporter molecules complete the reaction. The BeadXpress Reader uses fluidics to collect and array the microbeads. The beads are scanned for their code and fluorescent signals, generating data as binary files, which are then used in downstream analysis with the assay-specific kit manifest files. The assay-specific kit manifest contains the parameters and cutoffs used to produce and report a genotype result.
M. Performance Characteristics (if/when applicable):
- Analytical performance: 1.
- a. Precision/Reproducibility:
A panel of 15 genomic DNA samples isolated from blood and consisting of 3 independent samples for each of the 5 possible genotypes (including Wild Type), were distributed to each of the three sites. At each site, two operators tested each sample in duplicate once a day for 5 non-consecutive days. Samples yielding invalid results were retested once and no incorrect calls were observed when the results were compared to bi-directional sequencing. Overall summary data based on the number of calls are shown below in Table 1 and 2. Summary data by operator and by site are shown in Tables 3 and 4.
| No. of sample | No. of FV Calls Before Repeat | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| replicates | Testing | No. of FV Calls After Repeat Testing | |||||||||||||||||
| Correct calls | % | # repeated* | Correct calls | % | |||||||||||||||
| Genotype by | Site Site Site Site # No Agree- 95% Site Site Site Site Site Site Site Site Site Site Site Site Site Site Site Site Site Site | No Agree- | તેરજ | ||||||||||||||||
| sequencing | 1 2 | ന്നും നിന്നും അവലംബം പ്രത്യേക്കുന്നു. അവലംബം അവലംബം അവലംബം അവലംബം അവലംബം അവലംബം അവലംബം അവലംബം അവലംബം | 11 - | റ്റ് 2 പ | 3 Calls* | ment LCB3 | - | 12 " | 3 | - | 2 | 3 | calls ment | LCB | |||||
| Wild Type | 160 160 160 155 160 157 | 8 | 98.3 97.0 | ત્ત્વની સાથે અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને અને | ! () | 0 | 100 | 99.38 | |||||||||||
| Heterozygous | 80 | 80 | 80 | 79 | . 78 | 80 | 3 | 98.8 96.8 | 2 ' | 0 | 80 | 79 | 80 | 99.58 98.04 | |||||
| Homozygous | 60 | (୧୦ | 60 | રેક | 28 | 60 | 4 | 97.8 | 97.8 | 2 | " 2 " | 0 | 60 | 60 | 60 | 0 | 100 | 98.35 |
Table 1. Summary of Reproducibility Study - Factor V
Table 2. Summary of Reproducibility Study - Factor II
| Genotype by
sequencing | No. of sample replicates | | | No. of FII Calls Before Repeat
Testing | | | | | | No. of FII Calls After Repeat Testing | | | | | | | | |
|---------------------------|--------------------------|--------|--------|-------------------------------------------|-----|-----|----------------|----------------|-------------|---------------------------------------|---|---|---------------|-----|-----|-------------|----------------|------------|
| | Site 1 | Site 2 | Site 3 | Correct calls | | | # No
Calls¹ | %
Agreement | 95%
LCB³ | # repeated⁴ | | | Correct calls | | | No
calls | %
Agreement | 95%
LCB |
| Wild Type | 180 | 180 | 180 | 177 | 179 | 178 | 6 | 98.9 | 97.8 | 3 | 1 | 2 | 180 | 180 | 180 | 0 | 100 | 99.45 |
| Heterozygous | 60 | 60 | 60 | 59 | 60 | 60 | 1 | 99.4 | 97.4 | 1 | 0 | 0 | 60 | 60 | 60 | 0 | 100 | 98.35 |
| Homozygous | 60 | 60 | 60 | 57 | 59 | 59 | 5 | 97.2 | 94.3 | 3 | 1 | 1 | 60 | 60 | 60 | 0 | 100 | 98.35 |
1 Sample failures or results generating a "no call" result and require repeating.
2 Missed calls = wrong or incorrect calls
3 One-sided 95% lower confidence bound
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| | Site 1 | | Site 2 | | Site 3 | | %
Agreement |
|-------------------------|-----------------|-----------------|------------------|-----------------|-----------------|-----------------|--------------------|
| | Op 1 | Op 2 | Op 1 | Op 2 | Op 1 | Op 2 | |
| WT | 100%
(80/80) | 100%
(80/80) | 100%
(80/80) | 100%
(80/80) | 100%
(80/80) | 100%
(80/80) | 100%
(480/480) |
| HET | 100%
(40/40) | 100%
(40/40) | 97.5%
(39/40) | 100%
(40/40) | 100%
(40/40) | 100%
(40/40) | 99.6%
(239/240) |
| VAR | 100%
(30/30) | 100%
(30/30) | 100%
(30/30) | 100%
(30/30) | 100%
(30/30) | 100%
(30/30) | 100%
(180/180) |
| No-Call*
(1st pass) | 4 | 4 | 4 | 0 | 2 | 1 | 15 |
| No-Call
after retest | 0 | 0 | 1 | 0 | 0 | 0 | 1 |
Table 3. Summary of Reproducibility Result by Operator - Factor V
- resolved upon retest
Table 4. Summary of Reproducibility Result by Operator - Factor II
| Site 1 | Site 2 | Site 3 | % | |||||
|---|---|---|---|---|---|---|---|---|
| Op 1 | Op 2 | Op 1 | Op 2 | Op 1 | Op 2 | Agreement | ||
| WT | 100% | |||||||
| (90/90) | 100% | |||||||
| (90/90) | 100% | |||||||
| (90/90) | 100% | |||||||
| (90/90) | 100% | |||||||
| (90/90) | 100% | |||||||
| (90/90) | 100% | |||||||
| (540/540) | ||||||||
| HET | 100% | |||||||
| (30/30) | 100% | |||||||
| (30/30) | 100% | |||||||
| (30/30) | 100% | |||||||
| (30/30) | 100% | |||||||
| (30/30) | 100% | |||||||
| (30/30) | 100% | |||||||
| (180/180) | ||||||||
| VAR | 100% | |||||||
| (30/30) | 100% | |||||||
| (30/30) | 100% | |||||||
| (30/30) | 100% | |||||||
| (30/30) | 100% | |||||||
| (30/30) | 100% | |||||||
| (30/30) | 100% | |||||||
| (180/180) | ||||||||
| No-Call* | ||||||||
| (1st pass) | 4 | 3 | 2 | 0 | 2 | 1 | 12 |
- resolved upon retest
Lot-to-Lot Reproducibility:
Three kit lots were tested by running five partial plates on a single BeadXpress Reader by a single operator over the course of five nonconsecutive days. Six gDNA samples from commercially available cultured cells were used to represent each possible genotype, including a compound heterozygous sample and each was represented 5 times (replicates) in each run, at or near 25 ng input. Two no template controls (NTCs) were also represented in each run. Genotypes were determined by the VeraScan software and Factor V & Factor II Kit manifest file. No-template controls (NTCs) were considered valid if signals for all functional loci were below threshold. An invalid NTC counts against Call Rate but not against Correct Call Rate. Call Rate and Correct Call Rate were calculated for each run and for each kit lot by pooling the data from the five runs. No sample failures resulting in an invalid result were noted for two of the three lots and one sample of the third lot generated an invalid (no call) result.
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- b. Linearity/assay reportable range: Not applicable.
- Traceability, Stability, Expected values (controls, calibrators, or methods): C. The reference method is bi-directional sequencing.
Shelf life stability:
Summary stability information for an initial one month shelf life was provided, however real-time stability studies are still on-going.
Shipping stability:
Shipping stability was simulated by exposing three separate lots to cycling temperatures for specified durations from 22°C (4 hr.), 35°C (2 hr.), 30°C (36 hr.), and 35°C (22 hr.) to simulate 48 hour domestic shipping in the summer. Upon completion of temperature cycling, each kit was placed in dry ice and then functionally tested. Kits 1 and 3 each had one sample give an invalid result.
Carryover:
DNA samples were distributed across the reaction plate such that high concentrations of Factor V and Factor II heterozygote or homozygote variant samples were alternated with low concentrations of wild type or negative control samples in a checkerboard pattern. High concentrations of gDNA consisted of 500 ng input and low concentrations consisted of 25 ng input gDNA. All DNA samples genotyped correctly and there was no evidence of carryover from high concentration samples into low concentration samples. Three of the 24 NTC samples gave a signal over the acceptable threshold, however an investigation of the signals for each of the mutations showed that the only potential source for the contamination was several columns away with low concentration and other NTCs in between or were from wells after the affected wells which does not support potential carryover in two of the three cases. Three additional studies were performed but the original observations were not reproduced and the initial failures were not indicative system performance with respect to carryover.
- d. Detection limit:
Analytical sensitivity for this test was defined as the lower limit of DNA input needed to generate a valid genotyping result. To establish a preliminary range of acceptable DNA input, a series of experiments was performed using Factor V and Factor II wild type, heterozygous and homozygous variant gDNA samples obtained from commercially available cell lines. DNA samples were suspended in TE buffer, such that the DNA input ranged from 1 – 1,000 ng per sample. Five replicates of each sample were run per plate and DNA input levels of 5 ng, 10 ng, 25 ng, 500 ng, and 1000 ng met the preliminary passing criteria where all replicates of all genotypes produce the correct result when compared to bi-directional sequencing. Twenty-five (25) and 500 ng were selected as the preliminary DNA input claim based on having a lower (10 ng) and a higher (1000 ng) input, respectively, that passed the preliminary passing criteria. To allow for sample failures unrelated to DNA input, one invalid
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sample per run was allowed and one sample with a failed hybridization control was allowed. A preliminary range for a DNA input claim was established with a "low" and a "high" DNA input. The DNA input limits of 25 ng (5 ng/uL) and 500 ng (100 ng/uL) were tested with another two reagent kit lots and one additional VeraCode Bead Plate Factor V/Factor II lot and all replicates were successfully genotyped.
- e. Analytical specificity:
To determine the potential effect of heparin on test results as interference may be observed from patients on heparin therapy, a concentrated solution of sodium heparin was spiked directly into prospectively drawn blood samples, as recommended in CLSI EP7-A2, at 100 U/dL, 300 U/dL, and 900 U/dL. High levels of heparin added to whole blood did not adversely affect assay performance on the resulting extracted DNA.
To rule out any potential interference by endogenous interfering substances (i.e., bilirubin, hemoglobin, and cholesterol) each was spiked into aliquots from two EDTA-anticoagulated blood samples (1 FV HET and 1 FII HET) to a final concentration, at or above those recommended in Appendix D of CLSI EP7-A2. at 684 umol/L (bilirubin), 13 mmol/L (cholesterol), and 2 g/L (hemoglobin). Each spiked aliquot was tested with the VeraCode Bead Plate Factor V/Factor II and compared to an aliquot spiked with the individual carrier used to dilute the interferent. All samples genotyped equivalently across the entire experiment and no assay failures were observed in the external positive control samples or the samples extracted from blood spiked with potential interfering substances or vehicle only. Therefore elevated levels (as defined by CLSI guideline EP7-A2) of bilirubin, cholesterol, hemoglobin, and heparin in blood do not adversely influence the performance of the VeraCode Genotyping Test for Factor V and Factor II. The claimed genotypes for these DNA samples were confirmed by bidirectional sequencing.
- f. Assay cut-off: Not applicable.
2. Comparison studies:
- a. Method comparison with predicate device:
Accuracy was measured as overall percent agreement of the genotyping results produced by the VeraCode Genotyping Test for Factor V and Factor II as compared to those resulting from bi-directional DNA sequencing. Ninety-two patient samples were accrued at each of the three sites, yielding a total of 276 patient samples, from pre-selected or unscreened patients undergoing Factor V testing and each site was provided with two archived DNA samples to serve as positive controls. The samples were then analyzed using the VeraCode and compared to bi-directional sequencing analysis performed at an independent reference laboratory. All genomic DNA samples were extracted from EDTA anti-coagulated whole blood samples. A summary of the make up of samples by site and summary results are shown in Tables 5-7 below.
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| Site 1 | Site 2 | Site 3 | |
|---|---|---|---|
| WT (for FV) | 72 | 78 | 63 |
| WT (for FII) | 83 | 85 | 77 |
| FVL Heterozygous | 17 | 11 | 21 |
| FVL Homozygous | 3 | 3 | 8 |
| FII Heterozygous | 7 | 5 | 12 |
| FII Homozygous | 2 | 2 | 3 |
Table 5. Summary of samples genotypes by site.
Table 6. Summary Method Comparison – Factor V
| Number of FVL Calls Before Repeat Testing | Number of FVL Calls After Repeat Testing | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Genotype by | ||||||||||||
| sequencing | # | |||||||||||
| samples | Correct | |||||||||||
| calls | # No | |||||||||||
| Calls1 | Missed | |||||||||||
| Calls2 | % | |||||||||||
| Agreement | 95% | |||||||||||
| LCB3 | Correct | |||||||||||
| calls | # No | |||||||||||
| Calls1 | Missed | |||||||||||
| Calls2 | # | |||||||||||
| Repeated | ||||||||||||
| samples4 | % | |||||||||||
| Agreement | 95% | |||||||||||
| LCB3 | ||||||||||||
| Wild Type | 213 | 213 | 0 | 0 | 100 | 89.6 | 213 | 0 | 0 | 0 | 100 | 98.6 |
| Heterozygous | 49 | 46 | 3 | 0 | 93.88 | 84.93 | 49 | 0 | 0 | 3 | 100 | 94.07 |
| Homozygous | 14 | 13 | 1 | 0 | 92.86 | 70.33 | 13 | 1 | 0 | 1 | 92.86 | 70.33 |
Table 7. Summary Method Comparison - Factor II.
| Number of FII Calls Before Repeat Testing | Number of FII Calls After Repeat Testing | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Misse | # | |||||||||||
| Genotype by | # | Correct | # No | Missed | % | વેરી જેવી સવલતો પ્રાપ્ય થયેલી છે. આ ગામનાં લોકોનો મુખ્ય વ્યવસાય ખેતી, ખેતમજૂરી તેમ જ પશુપાલન છે. આ ગામમાં મુખ્યત્વે ખેત-ઉત્પાદની તેમ જ દૂધની ડેરી જેવી સવલતો પ્રાપ્ય થયેલી છે | Correct # No | in de co | Repeated | % | વેરી જેવી સવલતો પ્રાપ્ય થયેલી છે. આ ગામમાં પ્રાથમિક શાળા, પંચાયતઘર, આંગણવાડી તેમ જ દૂધની ડેરી જેવી સવલતો પ્રાપ્ય થયેલી છે. આ ગામમાં પ્રાથમિક શાળા, પંચાયતઘર, આંગણવાડી તેમ જ દ | |
| sequencing | samples | . calls ! ? | Calls | Calls- | Agreement LCB3 | calls | Calls Calls = samples Agreement LCB3 | |||||
| Wild Type | 245 | 244 | 0 | ਰੇਰੇ 'ਤੇਰੇ | 98.08 | 244 | () | તેત્વે તે તે તે તે તે તે તે તે તે તે તે તે તે આ ગામમાં પ્રાથમિક શાળા, પંચાયતઘર, આંગણવાડી તેમ જ દૂધની ડેરી જેવી સવલતો પ્રાપ્ય થયેલી છે. આ ગામનાં પ્રાથમિક શાળા, પંચાયતઘર, આંગણ | 98.08 | |||
| Heterozygous | 24 | 23 | 0 | 95.83 | 81.71 | 24 | 0 | 0 | 100 | 88.27 | ||
| Homozygous | l | 7 | 0 | 0 | 100 | 65.18 | 7 | 0 | 0 | 0 | 100 | 65.18 |
1 Sample failures or results generating a "no call" result and require repeating.
2 Missed calls = wrong or incorrect calls
3 One-sided 95% lower confidence bound
b. Matrix comparison:
Not applicable. Both assays use gDNA purified from EDTA anti-coagulated whole blood
-
- Clinical studies:
- Clinical Sensitivity: a. Not applicable.
- b. Clinical specificity: Not applicable.
- c. Other clinical supportive data (when a. and b. are not applicable): Not applicable.
-
- Clinical cut-off:
Not applicable.
- ನ. Expected values/Reference range: Not applicable. Factor II (G20210A) and Factor V Leiden (G1691A) mutations are present in 2% and 5% of the general population, respectively.
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.