← Product Code [LSR](/productcode/LSR) · K062473

# LIAISON BORRELIA IGG/IGM ASSAY, MODEL 310870; SERUM CONTROLS, MODEL 310871 (K062473)

_DiaSorin, Inc. · LSR · Apr 12, 2007 · Microbiology · SESE_

**Canonical URL:** https://fda-staging.innolitics.com/device/K062473

## Device Facts

- **Applicant:** DiaSorin, Inc.
- **Product Code:** [LSR](/productcode/LSR.md)
- **Decision Date:** Apr 12, 2007
- **Decision:** SESE
- **Submission Type:** Traditional
- **Regulation:** 21 CFR 866.3830
- **Device Class:** Class 2
- **Review Panel:** Microbiology
- **Attributes:** Real-World Evidence

## Real-World Evidence

| Submission | Device | Sponsor | RWD Sources | RWE Use Summary | Key Tags |
| --- | --- | --- | --- | --- | --- |
| K062473 · Apr 12, 2007 | LIAISON BORRELIA IGG/IGM ASSAY, MODEL 310870; SERUM CONTROLS, MODEL 310871 | DiaSorin, Inc. | CDC-provided retrospective clinical serum samples; Retrospective serum samples from LYMErix vaccine recipients | Retrospective clinical samples were used to supplement prospective clinical trial data to demonstrate the assay's performance characteristics across characterized Lyme disease cases and vaccinated individuals. | Retrospective samples; CDC serum panel; Vaccine recipient samples |

### Clinical Evidence

| Study Design | Population | Comparator | Key Endpoints |
| --- | --- | --- | --- |
| Retrospective analysis | Patients with characterized Lyme disease; Sample Size: 60 | Not applicable for this study | Percent agreement (Positive/Negative) |
| Retrospective analysis | LYMErix vaccine recipients; Sample Size: 11 | Immunetics® C6 Lyme ELISA | Agreement with comparator |

## Indications for Use

The LIAISON® Borrelia burgdorferi assay uses chemiluminescent immunoassay (CLIA) technology on the LIAISON® Analyzer (Model 15970) for the qualitative presumptive detection of IgG and IgM antibodies to VlsE (variable major protein-like sequence, expressed) protein antigen of Borrelia burgdorferi in human serum. This assay should be used only 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 Borrelia burgdorferi and can be used to support a clinical diagnosis of Lyme disease. Negative results by LIAISON® Borrelia burgdorferi Assay should not be used to exclude Lyme disease.

## Device Story

Device is an indirect chemiluminescent immunoassay (CLIA) for qualitative detection of IgG/IgM antibodies to Borrelia burgdorferi VlsE antigen in human serum. Input: patient serum samples. Operation: LIAISON® Analyzer performs automated incubation and wash cycles; magnetic particles coated with recombinant VlsE antigens capture anti-Borrelia antibodies; isoluminol-antibody conjugate binds to captured antibodies; starter reagents induce flash chemiluminescence. Output: relative light units (RLU) measured by photomultiplier, indicating antibody presence. Used in clinical laboratory settings by trained personnel. Results are presumptive; positive/equivocal findings require supplemental Western blot testing to support clinical diagnosis of Lyme disease. Benefits include automated processing and standardized detection of exposure to B. burgdorferi.

## Clinical Evidence

Clinical trials included 1038 prospective samples (70% positive agreement, 99.1% negative agreement), 60 CDC-characterized retrospective samples (90% overall agreement), and 11 vaccine recipient samples. Reproducibility studies (CLSI EP15-A2 and EP5-A2) conducted across 3 sites and multiple instruments showed overall %CV ranging from 8.06% to 17.57% for Index values. No clinical data beyond comparative performance testing provided.

## Technological Characteristics

Indirect chemiluminescent immunoassay (CLIA). Solid phase: magnetic particles coated with recombinant Borrelia VlsE antigens. Conjugate: mouse monoclonal anti-human IgG/IgM linked to isoluminol derivative. Automated instrumentation (LIAISON® Analyzer). Qualitative detection based on RLU measurement. Prescription use only.

## 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

- Immunetics® C6 B. burgdorferi (Lyme) ELISA™ Kit ([K003754](/device/K003754.md))

## Submission Summary (Full Text)

> This content was OCRed from public FDA records by [Innolitics](https://innolitics.com). If you use, quote, summarize, crawl, or train on this content, cite Innolitics at https://innolitics.com.
>
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# 510(k) SUBSTANTIAL EQUIVALENCE DETERMINATION DECISION SUMMARY

A. 510(k) Number:
K062473

B. Purpose for Submission:
New device

C. Measurand:
Borrelia burgdorferi IgG/IgM antibodies

D. Type of Test:
Chemiluminescent immunoassay

E. Applicant:
DiaSorin, Inc.

F. Proprietary and Established Names:
DiaSorin LIAISON® Borrelia burgdorferi
DiaSorin LIAISON® Borrelia burgdorferi Serum Controls

G. Regulatory Information:
1. Regulation section: 21CFR 866.3830; Treponema pallidum treponemal test reagents
2. Classification: Class: II
3. Product code: LSR; Reagent, Borrelia Serological Reagent
4. Panel: 83 Microbiology

H. Intended Use:
The LIAISON® Borrelia burgdorferi assay uses chemiluminescent immunoassay (CLIA) technology on the LIAISON® Analyzer (Model 15970) for the qualitative presumptive detection of IgG and IgM antibodies to VlsE (variable major protein-like sequence, expressed) protein antigen of Borrelia burgdorferi in human serum. This assay should be used only on samples from patients with signs and

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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 Borrelia burgdorferi and can be used to support a clinical diagnosis of Lyme disease. Negative results by LIAISON® Borrelia burgdorferi Assay should not be used to exclude Lyme disease.

## Controls

The LIAISON® Borrelia burgdorferi Serum Controls (negative, positive) are used to monitor the performance of the LIAISON® Borrelia burgdorferi chemiluminescent immunoassay (CLIA) for the qualitative determination of IgG/IgM antibodies to B. burgdorferi in human serum. The performance of the LIAISON® Borrelia burgdorferi Serum Controls has not been established with any other Lyme disease assay.

2. Indication(s) for use:

The LIAISON® Borrelia burgdorferi assay uses chemiluminescent immunoassay (CLIA) technology on the LIAISON® Analyzer for the qualitative presumptive detection of IgG and IgM antibodies to VlsE (variable major protein-like sequence, expressed) protein antigen of Borrelia burgdorferi in human serum. This assay should be used only 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 Borrelia burgdorferi and can be used to support a clinical diagnosis of Lyme disease. Negative results by LIAISON® Borrelia burgdorferi should not be used to exclude Lyme disease.

## Controls

The LIAISON® Borrelia burgdorferi Serum Controls contains two assayed quality control sera (negative and positive) that are used to monitor the performance of the LIAISON® Borrelia burgdorferi assay.

3. Special conditions for use statement(s):

For prescription use

4. Special instrument requirements:

None

I. Device Description:

The method for qualitative determination of IgG and IgM to Borrelia burgdorferi is an indirect chemiluminescence immunoassay (CLIA). All assay steps (with the

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exception of magnetic particle resuspension) and incubations are performed by the LIAISON® Analyzer. The principal components of the test are magnetic particles (solid phase) coated with recombinant Borrelia VlsE 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 antibodies present in calibrators, samples or controls bind to the solid phase. During the second incubation, the antibody conjugates react with anti-Borrelia 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 Borrelia burgdorferi antibodies present in calibrators, samples or controls.

## Controls Description:

Positive and negative serum controls are made from defibrinated human plasma.

## J. Substantial Equivalence Information:

1. Predicate device name(s): Immunetics® C6 B. burgdorferi (Lyme) ELISA™ Kit
2. Predicate 510(k) number(s): K003754
3. Comparison with predicate:

|  Similarities  |   |   |
| --- | --- | --- |
|  Item | Device | Predicate  |
|  Specimen Type | Human serum | Human serum  |
|  Method and type | Qualitative | Qualitative  |
|  Differences  |   |   |
|  Item | Device | Predicate  |
|  Method and Type | Chemiluminescent | ELISA  |
|  Instrumentation | Immunoassay | Manual  |
|  Antigens | Automated | Proteins from B. burgdorferi and B. garinii  |
|   | Proteins from B. burgdorferi and B. garinii | B. burgdorferi  |

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K. Standard/Guidance Document Referenced (if applicable):

Not applicable

L. Test Principle:

Chemiluminescent immunoassay

M. Performance Characteristics (if/when applicable):

1. Analytical performance:

a. Precision/Reproducibility:

Study 1: Assay precision performance was established at DiaSorin following a protocol outlined in CLSI document, EP5-A2. Six (6) serum samples and one lot of LIAISON® Borrelia Serum Controls (2) were tested in four replicates per day over 20 working days on two LIAISON® instruments. The panel members were selected to represent negative to high-positive analyte levels. The results indicated a %CV of 8 to 14 for positive samples.

Study 2: An assay reproducibility study was conducted at two external US laboratories and at DiaSorin using the same serum samples described above in a five-day protocol outlined in CLSI document, EP15-A2. The samples were tested at all three sites, in four replicates per day for five days. Each site used a different LIAISON® Borrelia burgdorferi IgG/IgM Assay lot. The results indicated a %CV of 8 to 11 for positive samples.

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:

The LIAISON® Borrelia burgdorferi assay was used to test samples from apparently healthy adult blood donors collected in a region in which Lyme disease is endemic (Pennsylvania) and in a region in which Lyme disease is rare (Arizona).

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|   | N | Negative | Equivocal | Positive | % positive  |
| --- | --- | --- | --- | --- | --- |
|  Endemic | 300 | 297 | 1 | 2 | 0.7%  |
|  Non-endemic | 300 | 299 | 0 | 1 | 0.3%  |

Cross-reactivity: The cross-reactivity studies for the LIAISON® Borrelia burgdorferi IgG/IgM Assay were done by testing closely related members of the spirochete genera (T. pallidum), tick-borne diseases (Babesiosis, HGE, TBRF and RMSF), organisms that may cause infectious disease, (CMV, EBV, HIV), H.pylori, and other conditions that may result from atypical immune system activity such as RF, RA, Autoimmune diseases, SLE, MS as well as HAMA and anti-E.Coli. Eleven specimens out of 300 total specimens tested from the cross-reaction panel were positive. Potential assay interference due to circulating antibodies against Human Ehrlichiosis (HGE) and Tick Borne Relapsing Fever (TBRF) has been detected.

f. Assay cut-off:

Not applicable

2. Comparison studies:

a. Method comparison with predicate device:

Sixty (60) samples from an archived collection consisted of clinically-defined (culture confirmed) Lyme disease patients were tested with the LIAISON® Borrelia IgG/IgM Assay. These samples consisted of early, convalescent, and neurologic stages.

Sensitivity: 73.3% (44/60)

Percent Agreement with predicate ELISA device

|  Positive | 93.2% | (41/44)  |
| --- | --- | --- |
|  Negative | 81.3% | (13/16)  |
|  Overall | 90.0% | (54/60)  |

Vaccine Recipients: Eleven (11) frozen banked samples were tested from adults treated with a licensed recombinant OspA vaccine (LYMErix™, manufactured by GlaxoSmithKline Biologics). All samples were negative by the test indicating no cross reactivity with the vaccine antigens.

CDC Serum Panel: A serum panel was obtained from the Centers for Disease Control and Prevention and tested by the LIAISON® Borrelia burgdorferi IgG/IgM Assay. The panel consists of 5 normal sera and 37 sera with confirmed Lyme disease and obtained at different times from onset of disease. It was assayed using the test kit and the positive agreement was found to be 73% (27/37) and the negative agreement to be 100% (5/5).

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Prospective Samples: A total of 1038 which were prospectively collected and tested. LIAISON® Borrelia burgdorferi IgG/IgM Assay showed 41 samples as positive and 4 as equivocals.

Agreement with predicate ELISA

|  Positive | 70.0% | (35/50)  |
| --- | --- | --- |
|  Negative | 99.1% | (973/982)  |
|  Overall | 97.1% | (1008/1038)  |

The samples that were found to be positive or equivocal in the ELISA are tested on a second step Western blot.

|   | Result | n | Western Blot  |   |
| --- | --- | --- | --- | --- |
|   |  |  | + | -  |
|  LIAISON | + | 41 | 22 | 19  |
|   | ± | 4 | 0 | 4  |
|  Predicate | + | 50 | 23 | 27  |
|   | ± | 6 | 0 | 6  |

b. Matrix comparison:

Not applicable

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

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4. Clinical cut-off:
Not applicable

5. Expected values/Reference range:
Not applicable

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.

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**Source:** [https://fda-staging.innolitics.com/device/K062473](https://fda-staging.innolitics.com/device/K062473)

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