Lyme Disease (Borrelia burgdorferi), Molecular Detection, PCR, Blood
NY State Approved Indicates the status of NY State approval and if the test is orderable for NY State clients.
Confirmation of active Lyme disease
Monitoring Lyme disease treatment
PCR testing should be limited to patients with a positive, or at least an equivocal, serologic test for antibody to Borrelia burgdorferi.
Real-Time Polymerase Chain Reaction (PCR)/DNA Probe Hybridization
(PCR is utilized pursuant to a license agreement with Roche Molecular Systems, Inc.)
Reporting Name A shorter/abbreviated version of the Published Name for a test; an abbreviated test name
Lyme Disease PCR, B
Borrelia burgdorferi by PCR
Lyme Disease (PCR)
Lyme Disease (PCR)
Specimen Type Describes the specimen type needed for testing
Whole Blood EDTA
Specimen Required Defines the optimal specimen. This field describes the type of specimen required to perform the test and the preferred volume to complete testing. The volume allows automated processing, fastest throughput and, when indicated, repeat or reflex testing.
Container/Tube: Lavender top (EDTA)
Specimen Volume: 1 mL
Forms: If not ordering electronically, submit a Microbiology Request Form (Supply T244) with the specimen.
Specimen Minimum Volume Defines the amount of specimen required to perform an assay once, including instrument and container dead space. Submitting the minimum specimen volume makes it impossible to repeat the test or perform confirmatory or perform reflex testing. In some situations, a minimum specimen volume may result in a QNS (quantity not sufficient) result, requiring a second specimen to be collected.
Mild OK; Gross OK
Anticoagulants other than EDTA
Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the laboratory. Alternate acceptable temperature(s) are also included.
|Whole Blood EDTA||Refrigerated (preferred)||7 days|
Clinical Information Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test
Lyme disease is a multisystem and multistage infection caused by 3 species of tick-borne spirochetes in the Borrelia burgdorferi sensu lato genogroup. These spirochetes include Borrelia burgdorferi sensu stricto (North America and Western Europe), Borrelia afzelii (Central and Western Europe and Russia), and Borrelia garinii (Europe, Russia, and northern Asia). Endemic areas for Lyme disease in the United States correspond with the distribution of 2 tick species, Ixodes dammini (Northeastern and Upper Midwestern US) and Ixodes pacificus (West Coast US). In Europe, Ixodes ricinus transmits the spirochete.
Lyme disease exhibits a variety of symptoms that may be confused with immune and inflammatory disorders. Inflammation around the tick bite causes skin lesions. Erythema chronicum migrans (ECM), a unique expanding skin lesion with central clearing resulting in a ring-like appearance, is the first stage of the disease. Any of the following clinical manifestations may be present in patients with Lyme disease: arthritis, neurological disease, cardiac disease, or skin lesions. Neurologic and cardiac symptoms may appear with stage 2 and arthritic symptoms with stage 3 of Lyme disease. In some cases, a definitive distinction between stages is not always seen. Further, secondary symptoms may occur even though the patient does not recall a tick bite or a rash.
Early antibiotic treatment of Lyme disease can resolve clinical symptoms and prevent progression of the disease to later stages. Treatment with penicillin, tetracycline, erythromycin, chloramphenicol, or ceftriaxone is considered appropriate therapy.
Serology is currently the diagnostic method of choice for Lyme disease. The Second National Conference on the Serologic Diagnosis of Lyme Disease (1994) recommended that laboratories use a 2-test approach for the serologic diagnosis of Lyme disease. Accordingly, specimens are first tested by the more sensitive EIA or enzyme-linked immunosorbent assay (ELISA). A Western blot (WB) assay is used to confirm positive Lyme EIA or ELISA results due to the presence of IgG- or IgM-class antibodies. WB identifies the specific proteins to which the patient's antibodies bind. Although there are no proteins that specifically diagnose Borrelia burgdorferi infection, the number of proteins recognized in the WB assay is correlated with diagnosis.
Since serology may not be positive until 2 to 4 weeks after onset of ECM, direct detection of Borrelia burgdorferi-specific target DNA sequences using PCR is a promising adjunct to existing diagnostic tests. PCR has shown utility for detection of Borrelia burgdorferi DNA from skin biopsies of ECM lesions, and from synovial and cerebrospinal fluid in late-stage disease. Borrelia burgdorferi DNA can also, rarely, be detected from blood, but is not the test of choice from this source.
Reference Values Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.
A positive result indicates the presence of DNA from Borrelia burgdorferi, the agent of Lyme disease.
A negative result indicates the absence of detectable DNA from Borrelia burgdorferi in the specimen. Due to the diagnostic sensitivity limitations of the PCR assay, a negative result does not preclude the presence of the organism or active Lyme disease.
Cautions Discusses conditions that may cause diagnostic confusion, including improper specimen collection and handling, inappropriate test selection, and interfering substances
Serologic tests are recommended for diagnosis of Lyme disease. PCR may play an adjunctive role, but may not detect Borrelia burgdorferi DNA from blood in cases of active or chronic disease. A negative result does not rule-out Lyme disease, since inhibitory substances may be present in the specimen and the assay has limited diagnostic sensitivity when testing certain types of specimens. If clinical features of illness are highly indicative of Lyme neuroborreliosis, serologic testing on cerebrospinal fluid is warranted. Patients with active infection due to Borrelia afzelii or Borrelia garinii may have positive results from this PCR test, which will be reported as atypical gene sequence and prompt additional testing. PCR test results should be used as an aid in diagnosis and not considered diagnostic by themselves. These results should be correlated with serologic and epidemiologic data and clinical presentation of the patient. Concurrent infections with multiple tick-borne pathogens, including Ehrlichia chaffeensis/Anaplasma phagocytophilum and Babesia microti have been reported in United States.
The following validation data supports the use of this assay for clinical testing.
Accuracy/Diagnostic Sensitivity and Specificity:
Results from this real-time PCR assay on the LightCycler (LC PCR) directed to the plasminogen-binding protein (pbp) were compared to those generated using conventional PCR (target ospA gene) for synovial fluid (82), whole blood (22), and cerebrospinal fluid (CSF) (85). Using the conventional PCR as the gold standard, the diagnostic sensitivity and specificity for detection of Borrelia burgdorferi was as follows: synovial fluid (98.1%; 100%), whole blood (100%; 100%), and CSF (80%; 100%).
In the original spiking studies, fresh and paraffin tissue, synovial fluid, CSF, and whole blood were spiked with Borrelia plasmid at an approximate concentration of 100 targets/mcL. At 100 targets/mcL, 100% of fresh and paraffin tissue, synovial fluid, and CSF were positive and 92% of whole blood samples were positive. In additional spiking studies, CSF (40), fresh tissue (60), and whole blood (40) negative samples were tested by spiking half with positive-control plasmid at the limit of detection (25-50 targets/mcL). The samples were extracted and tested in a blinded fashion; 97% of spiked CSF, 100% of spiked tissue, and 91% of spiked whole blood were positive and 100% of the nonspiked specimens were negative.
Analytical Sensitivity/Limit of Detection (LoD):
The lower limit of detection (LoD) is approximately 1,000 genomic targets/mcL whole blood.
No PCR signal was obtained from the extracts of 22 bacterial, viral, parasitic, and fungal isolates that can cause symptoms similar to Lyme disease including; Rickettsia rickettsii, Rickettsia typhi, Ehrlichia canis, Babesia microti, Plasmodium falciparum, Plasmodium vivax, Bartonella henselae, Bartonella quintana, Herpes simplex virus, and Toxoplasma gondii.
Interassay precision was 100% and intra-assay precision was 100%.
Although the reference range is "Negative" for this assay, it may detect low-grade asymptomatic bacteremia from individuals exposed to Lyme-endemic areas. However, this assay is only to be used for patients with a clinical history and symptoms consistent with Lyme, and must be interpreted in the context of serologic tests, which are the gold standard for diagnosis of Lyme disease. This test is not used to screen asymptomatic patients.
This is a qualitative assay, and the results are reported as negative or positive for targeted Borrelia burgdorferi.
Clinical Reference Provides recommendations for further in-depth reading of a clinical nature
1. Keller TL, Halperin JJ, Whitman M: PCR detection of Borrelia burgdorferi DNA in cerebrospinal fluid of Lyme neuroborreliosis patients. Neurology 1992;42:32-42
2. Nocton JJ, Bloom BJ, Rutledge BJ, et al: Detection of Borrelia burgdorferi DNA by polymerase chain reaction in cerebrospinal fluid with Lyme neuroborreliosis. J Infect Dis 1996;174:623-627
3. Nocton JJ, Dressler F, Rutledge BJ, et al: Detection of Borrelia burgdorferi DNA by polymerase chain reaction in synovial fluid from patients with Lyme arthritis. N Engl J Med 1994;330:229-234
4. Reed KD: Laboratory testing for Lyme disease: possibilities and practicalities. J Clin Microbiol 2002;40:319-324
5. CDC: Recommendation for test performance and interpretation from second national conference on serological diagnosis of lyme disease. MMWR Morb Mortal Wkly Rep 1996;45:481-484
6. Babady NE, Sloan LM, Vetter EA, et al: Percent positive rate of Lyme real-time polymerase chain reaction in blood, cerebrospinal fluid, synovial fluid, and tissue. Diagn Microbiol Infect Dis 2008;62(4):464-466
Method Description Describes how the test is performed and provides a method-specific reference
Nucleic acid is extracted from blood using the automated MagNA Pure LC instrument system. The extract is then transferred to individual self-contained capillary cuvettes for amplification. The LightCycler is an automated instrument that amplifies and monitors the development of target nucleic acid (amplicon) after each cycle of PCR. The DNA target for PCR assay is the 283-bp plasminogen-binding protein gene (pbp), which is present at a frequency of 1 copy per organism in all 3 pathogenic species of the Borrelia burgdorferi sensu lato genogroup (Borrelia burgdorferi sensu stricto, Borrelia afzelii, and Borrelia garinii). A specific base pair DNA target sequence is amplified by PCR. The detection of amplicon is based on fluorescence resonance energy transfer (FRET), which utilizes 1 hybridization probe with a donor fluorophore, fluorescein, at the 3' end, and a second hybridization probe with an acceptor fluorophore, LC-Red 640, at the 5' end. When the target amplicon is present, the LC-Red 640 emits a measurable and quantifiable light signal at a specific wavelength. Presence of the specific organism nucleic acid may be confirmed by performing a melting curve analysis of the amplicon. Using features of the melting curve analysis, the assay primers and specific hybridization probes are able to detect and differentiate Borrelia burgdorferi sensu stricto from Borrelia afzelii, and Borrelia garinii. The melting curve analysis of this assay cannot differentiate between Borrelia afzelii and Borrelia garinii. Each assay run can be completed within 60 minutes.(Cockerill FR, Uhl FR: Applications and challenges of real-time PCR for the clinical microbiology laboratory. In Rapid Cycle Real-Time PCR. Edited by U Reischl, C Wittwer, F Cockerill. Springer, NY 2002)
Day(s) and Time(s) Test Performed Outlines the days and times the test is performed. This field reflects the day and time the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time required before the test is performed. Some tests are listed as continuously performed, which means assays are performed several times during the day.
Monday through Saturday; (June through November)
Monday through Friday; (December through May)
Analytic Time Defines the amount of time it takes the laboratory to setup and perform the test. This is defined in number of days. The shortest interval of time expressed is "same day/1 day," which means the results may be available the same day that the sample is received in the testing laboratory. One day means results are available 1 day after the sample is received in the laboratory.
Maximum Laboratory Time Defines the maximum time from specimen receipt at Mayo Medical Laboratories until the release of the test result
Specimen Retention Time Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded
Performing Laboratory Location The location of the laboratory that performs the test
Test Classification Provides information regarding the medical device classification for laboratory test kits and reagents. Tests may be classified as cleared or approved by the US Food and Drug Administration (FDA) and used per manufacturer's instructions, or as products that do not undergo full FDA review and approval, and are then labeled as an Analyte Specific Reagent (ASR), Investigation Use Only (IUO) product, or a Research Use Only (RUO) product.
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.
CPT Code Information Provides guidance in determining the appropriate Current Procedural Terminology (CPT) code(s) information for each test or profile. The listed CPT codes reflect Mayo Medical Laboratories interpretation of CPT coding requirements. It is the responsibility of each laboratory to determine correct CPT codes to use for billing.
LOINC® Code Information Provides guidance in determining the Logical Observation Identifiers Names and Codes (LOINC) values for the result codes returned for this test or profile.
|Result ID||Reporting Name||LOINC Code|
|56080||Lyme Disease PCR, B||32667-8|