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HelpTest Code BHSF Beta-Human Chorionic Gonadotropin, Quantitative, Spinal Fluid
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Reporting Name
Chorionic Gonad Beta-Subunit QN,CSFSpecimen Type
CSFSpecimen Required
Patient Preparation: For 12 hours before specimen collection, patient should not take multivitamins or dietary supplements (eg, hair, skin, and nail supplements) containing biotin (vitamin B7).
Container/Tube: Sterile vial
Specimen Volume: 1 mL
Collection Instructions: Submit specimen from collection vial number 1.
Reject Due To
| Hemolysis | Reject |
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| CSF | Refrigerated (preferred) | 28 days |
| Ambient | 14 days | |
| Frozen | 14 days |
Specimen Minimum Volume
0.75 mL
Day(s) Performed
Monday through Saturday
Specimen Retention Time
14 daysReport Available
1 to 3 daysReference Values
<1.0 IU/L
Useful For
Aiding in the diagnosis of brain metastases of testicular cancer or extragonadal intracerebral germ cell tumors
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 |
Method Description
The Roche human chorionic gonadotropin (hCG) assay is a 2-site immunometric sandwich assay using electrochemiluminescence detection. Patient specimen, biotinylated monoclonal hCG-specific antibody, and monoclonal hCG-specific antibody labeled with a ruthenium react to form a complex. Streptavidin-coated microparticles act as the solid phase to which the complex becomes bound. Voltage is applied to the electrode inducing a chemiluminescent emission from the ruthenium, which is then measured against a calibration curve to determine the amount of hCG in the patient specimen.(Package insert: Elecsys HCG+B. Roche Diagnostics; V1.0. 05/2024)
Forms
If not ordering electronically, complete, print, and send an Oncology Test Request (T729) with the specimen.