Clinics and Departments

Laboratory Services

Lab Dept:

Other Fluids

Test Name:

HCG BETA SUBUNIT, CSF

General Information

Lab Order Codes:

BHCC

Synonyms:

Chorionic Gonadotropin, Beta-Subunit (Quantitative), CSF

CPT Codes:

84702 – Gonadotropin, chorionic; quantitative

Test Includes:

HCG Beta subunit, CSF concentration reported in IU/L.

Logistics

Test Indications:

Measurement of human chorionic gonadotropin (hCG) in spinal fluid facilitates diagnosis of brain metastases of testicular cancer or extragonadal intracererbral germ cell tumors.

Lab Testing Sections:

Chemistry - Sendouts

Referred to:

Mayo Medical Laboratories (Test: BHSF/8877)

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

Monday – Saturday, 1 - 3 days

Special Instructions:

N/A

Specimen

Specimen Type:

CSF

Container:

Screw capped, sterile vial

Draw Volume:

0.5 mL (Minimum: 0.1 mL) spinal fluid

Processed Volume:

Same as Draw Volume

Collection:

Routine spinal fluid collection

Special Processing:

Lab Staff: Refrigerate CSF aliquot. Send specimen refrigerated. Forward promptly.

Patient Preparation:

None

Sample Rejection:

Mislabeled or unlabeled specimens

Interpretive

Reference Range:

≤1.5 IU/L

Note: Tumor markers are not specific for malignancy, and values may vary by method.

Critical Values:

N/A

Limitations:

Slight elevations of hCG in spinal may occur in non-neoplastic diseases.

Methodology:

Immunoenzymatic Assay

References:

Mayo Medical Laboratories March 2013



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