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Lab Dept:
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Serology
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Test Name:
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HEPATITIS A IgM ANTIBODY (ANTI-HAV IgM)
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General Information
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Lab Order Codes:
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HAVM
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Synonyms:
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Hepatitis A Virus IgM Antibody
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CPT Codes:
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86709 – Hepatitis A antibody, IgM
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Test Includes:
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Hepatitis A IgM Antibody reported positive or negative.
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Logistics
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Test Indications:
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Useful for diagnosis of a recent acute or subclinical hepatitis A infection. In most cases, antibody against hepatitis A antigen is detectable at the onset of symptoms (usually 15-45 days after exposure). Initial antibody consists almost entirely of the IgM subclass. Anti-HAV, IgM usually falls to undetectable levels 3-6 months after hepatitis A infection. Anti-HAV, IgG levels rise quickly once the virus is cleared and may persist for many years.
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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 Laboratories (Test# 8342)
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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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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1 – 2 days, test performed daily.
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Special Instructions:
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N/A
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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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3.0 mL (Minimum: 1.5 mL) blood
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Processed Volume:
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1.0 mL (Minimum: 0.5 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: Allow specimen to clot, centrifuge within 24 hours of collection, remove serum/plasma aliquot into a screw-capped round bottom plastic vial. Store and ship at frozen temperatures. 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, gross hemolysis, multiple freeze thaw cycles, gross lipemia, mislabeled or unlabeled specimens
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Interpretive
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Reference Range:
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Negative
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Critical Values:
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N/A
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Limitations:
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Positive anti-HAV IgM test results should be reported by the attending physician to the State Department of Health, as required by law in some states. Consider administration of immune globulin to contacts. Not useful for detection of acute hepatitis A following exposure and prior onset of symptoms.
Not useful for detection of acute hepatitis A following exposure and prior onset of symptoms.
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Methodology:
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Enzyme Immunoassay (EIA)
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Contraindications:
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N/A
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References:
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Mayo Medical Laboratories Web Page April 2007
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Updates:
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4/6/2004: Test moved from Memorial Blood Center of Minneapolis to Mayo Medical Laboratories.
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