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Lab Dept:
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Serology
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Test Name:
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HEPATITIS B QUANTITATIVE (HBV-DNA) PCR
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General Information
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Lab Order Codes:
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HBDQN
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Synonyms:
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HBV DNA Quantitative; HBV DNA Quantitation; HBV Viral Load; Hepatitis B Viral Load; HBV PCR
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CPT Codes:
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87517 – Hepatitis B virus, quantification
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Test Includes:
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Quantitation of HBV virus measured in IU/mL.
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Logistics
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Test Indications:
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Confirmation of chronic hepatitis B virus (HBV) infection. Quantification of HBV DNA in serum of patients with chronic HBV infection (previously hepatitis B surface antigen-positive). Monitoring disease progression in chronic HBV infection and /or response to anti-HBV therapy.
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Lab Testing Sections:
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Serology - Sendouts
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Referred to:
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Mayo Medical Labortories (Test: HBVQU)
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Phone Numbers:
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MIN Lab: 612-813-6280
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STP Lab: 651-220-6550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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2 – 4 days, test performed Monday - Friday.
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Special Instructions:
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For optimal monitoring of viral response, serial specimens should be of the same type.
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Specimen
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Specimen Type:
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Blood
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Container:
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Red top tube
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Draw Volume:
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4.5 mL (Minimum: 2.5 mL) blood
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Processed Volume:
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1.5 mL (Minimum: 0.8 mL) serum
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Collection:
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Routine venipuncture
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Special Processing:
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Lab Staff: Aseptically centrifuge specimen and separate serum from the clot within 6 hours. Serum aliquot should be placed in a screw-capped, round bottom plastic vial. Store and ship at frozen temperatures. Maintain sterility and forward promptly.
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Patient Preparation:
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None
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Sample Rejection:
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Specimens other than serum; warm specimens; lipemic specimens; icteric specimens; mislabeled or unlabeled specimens
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Interpretive
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Reference Range:
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Undetected
Interpretation:
The quantification rand of this assay is 20 to 170,000,000 IU/mL (1.30-8.23 log IU/mL). An “Undetected” result indicates that hepatitis B virus (HBV) DNA was not detected in the specimen.
A “Detected” result with the comment, “HBV DNA level is <20 IU/mL (<1.30 log IU/mL). This assay cannot accurately quantify HBV DNA below this level” indicates that the HBV DNA level is below the lower limit of quantification for this assay. When clinically indicated, follow-up testing with this assay is recommended in 1 to 2 months.
A quantitative result expressed in IU/mL and log IU/mL indicates the degree of active HBV viral replication in the patient. Monitoring HBV DNA levels over time is important for assessing disease progression or monitoring a patient’s response to anti-HBV therapy.
A ”Detected” result with the comment, “HBV DNA level is >170,000,000 IU/mL (>8.23 log IU/mL). This assay cannot accurately quantify HBV DNA above this level” indicates that the HBV DNA level is above the upper limit of quantification for this assay.
An indeterminate result with the comment “Inconclusive Result: Submit a new specimen for testing if clinically indicated” indicates that inhibitory substances may be present in the specimen. When clinically indicated, collection and testing of a new specimen is recommended.
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Critical Values:
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N/A
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Limitations:
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This test is not licensed by the FDA as a screening test for hepatitis B virus (HBV) infections or a diagnostic test to confirm the presence of HBV infection.
Laboratory evaluation of HBV infection status should begin with HBV serologic testing, including testing for the presence of hepatitis B surface antigen. A diagnosis of chronic HBV infection should not be based solely on the presence of detectable or quantifiable HBV DNA in a single serum specimen.
An “Undetected” HBV DNA test result in conjunction with a positive anti-HBV status does not exclude the possibility of a resolved HBV infection. When clinically indicated, patients should be retested for HBV DNA in 1 to 2 months, to distinguish between past/resolved HBV infection and chronic HBV infection with episodic viral replication.
Quantitative HBV DNA results generated by this assay may be more than 0.5 log IU/mL lower than those of the VERSANT HBV DNA 3.0 Assay (bDNA) among some clinical serum specimens.
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Methodology:
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Real-Time Polymerase Chain Reaction (PCR)
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References:
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Mayo Medical Laboratories Web Page April 2013
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Updated:
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4/29/2013: Method change, previously listed as bDNA, reference range change.
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