Test ID: BHSF Beta-Human Chorionic Gonadotropin, Quantitative, Spinal Fluid
Reporting Name
Chorionic Gonad Beta-Subunit QN,CSFUseful For
Aiding in the diagnosis of brain metastases of testicular cancer or extragonadal intracerebral germ cell tumors
Clinical Information
Human chorionic gonadotropin (hCG) is synthesized during pregnancy by syncytiotrophoblast cells. hCG may also be produced by neoplastic cells of testicular tumors (seminomas or nonseminomas), ovarian germ cell tumors, gestational trophoblastic disease, choriocarcinoma, and various nontrophoblastic tumors including breast, ovarian, pancreatic, cervical, gastric, and hepatic cancers.
Measurement of hCG is used as an adjunct in the diagnosis of germ cell tumors. The presence of hCG in cerebrospinal fluid (CSF) is suggestive of tumor presence. Pure germinomas are associated with low hCG concentrations in both serum and CSF. A subset of nongerminomatous germ cell tumors contain syncytiotrophoblastic giant cells. These tumors are associated with moderately increased hCG concentrations (<1000 IU/L) in the serum and/or CSF, and the survival rate in patients suffering these tumors is worse than that of patients with pure germinomas. In contrast, choriocarcinomas, another subset of nongerminomatous germ cell tumors, are associated with very high hCG concentrations (>1000 IU/L) in both serum and CSF. Quantification of the hCG in CSF can be important in guiding treatment and monitoring response to treatment of these tumors.
The combination of the specific antibodies used in the Roche Beta hCG immunoassay recognize the holo-hormone, "nicked" forms of hCG, the beta-core fragment, and the free beta-subunit.
Interpretation
Elevated levels of human chorionic gonadotropin in spinal fluid indicate the probable presence of central nervous system metastases or recurrence of tumor in patients with germ cell tumors, including patients with testicular cancer or choriocarcinoma.
Report Available
1 to 3 daysDay(s) Performed
Monday through Saturday
Clinical Reference
1. Tian C, Shi Q, Xiao G, et al: CSF and serum hCG in patients without gestational and neoplastic hCG-secretion. Scand J Clin Lab Invest. 2011 Jul;71(4):264-268
2. Tian C, Shi Q, Pu C, et al: Re-evaluation of the significance of cerebrospinal fluid human chorionic gonadotropin in detecting intracranial ectopic germinomas. J Clin Neurosci. 2011 Feb;18(2):223-226
3. Gonzalez-Sanchez V, Moreno-Perez O, Sanchez Pellicer PS, et al: Validation of the human chorionic gonadotropin immunoassay in cerebrospinal fluid for the diagnostic work-up of neurohypophyseal germinomas. Ann Clin Biochem. 2011 Sep;48(Pt 5):433-437
4. Hu Y, Ni J, Zhang H, et al:Â An immunoassay for human Chorionic gonadotropin in cerebrospinal fluid: validation of a modified-approved method for accreditation by the College of American Pathologists. J Lab Physicians. 2021 Sep 8;14(1):11-15. doi: 10.1055/s-0041-1733817.
5. Zhang H, Zhang P, Fan J, et al: Determining an optimal cutoff of serum beta-human chorionic gonadotropin for assisting the diagnosis of intracranial germinomas. PLoS One. 2016 Jan 15;11(1):e0147023. doi: 10.1371/journal.pone.0147023
Method Name
Electrochemiluminescent Immunoassay (ECLIA)
Specimen Type
CSFSpecimen Required
Patient Preparation: For 12 hours before specimen collection, do not take multivitamins or dietary supplements containing biotin (vitamin B7), which is commonly found in hair, skin, and nail supplements and multivitamins.
Container/Tube: Sterile vial
Specimen Volume: 1 mL
Collection Instructions: Submit specimen from collection vial 1.
Specimen Minimum Volume
0.75 mL
Specimen Stability Information
Specimen Type | Temperature | Time | Special Container |
---|---|---|---|
CSF | Refrigerated (preferred) | 28 days | |
Ambient | 14 days | ||
Frozen | 14 days |
Reference Values
<1.0 IU/L
Test Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
84702
LOINC Code Information
Test ID | Test Order Name | Order LOINC Value |
---|---|---|
BHSF | Chorionic Gonad Beta-Subunit QN,CSF | 14041-8 |
Result ID | Test Result Name | Result LOINC Value |
---|---|---|
BHSF | Chorionic Gonad Beta-Subunit QN,CSF | 14041-8 |
Forms
If not ordering electronically, complete, print, and send an Oncology Test Request (T729) with the specimen.
mml-adrenal-gonad-pituitary