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Lab Dept:
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Other Fluids
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Test Name:
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HCG BETA SUBUNIT, CSF
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General Information
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Lab Order Codes:
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BHCC
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Synonyms:
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Chorionic Gonadotropin, Beta-Subunit (Quantitative), CSF
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CPT Codes:
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84702 – Gonadotropin, chorionic; quantitative
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Test Includes:
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HCG Beta subunit, CSF concentration reported in IU/L.
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Logistics
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Test Indications:
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Measurement of human chorionic gonadotropin (hCG) in spinal fluid facilitates diagnosis of brain metastases of testicular cancer or extragonadal intracererbral germ cell tumors.
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Lab Testing Sections:
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Chemistry - Sendouts
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Referred to:
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Mayo Medical Laboratories (Test: BHSF/8877)
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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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Monday – Saturday, 1 - 3 days
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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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CSF
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Container:
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Screw capped, sterile vial
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Draw Volume:
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0.5 mL (Minimum: 0.1 mL) spinal fluid
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Processed Volume:
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Same as Draw Volume
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Collection:
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Routine spinal fluid collection
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Special Processing:
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Lab Staff: Refrigerate CSF aliquot. Send specimen refrigerated. Forward promptly.
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Patient Preparation:
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None
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Sample Rejection:
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Mislabeled or unlabeled specimens
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Interpretive
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Reference Range:
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≤1.5 IU/L
Note: Tumor markers are not specific for malignancy, and values may vary by method.
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Critical Values:
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N/A
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Limitations:
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Slight elevations of hCG in spinal may occur in non-neoplastic diseases.
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Methodology:
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Immunoenzymatic Assay
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References:
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Mayo Medical Laboratories March 2013
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