Test Details
Methodology
Free: Direct analog enzyme immunoassay (EIA); Total: liquid chromatography/tandem mass spectrometry (LC/MS-MS)
Result Turnaround Time
4 - 6 days
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
Use
Evaluate hirsutism and masculinization in women; evaluate testicular function in clinical states in which testosterone-binding proteins may be altered (obesity, cirrhosis, thyroid disorders)
Special Instructions
State patient's age and sex on the test request form.
Limitations
This test was developed and its performance characteristics determined by Labcorp. It has not been cleared or approved by the Food and Drug Administration.
Specimen Requirements
Specimen
Serum
Volume
2 mL
Minimum Volume
1.3 mL (Note: This volume does not allow for repeat testing.)
Container
Red-top tube or gel-barrier tube
Collection Instructions
Serum should be transferred from cells within one hour of collection and transferred to a plastic transport tube.
Stability Requirements
| Temperature | Period |
|---|---|
| Room temperature | 7 days |
| Refrigerated | 7 days |
| Frozen | 14 days |
| Freeze/thaw cycles | Stable x3 |
Storage Instructions
Room temperature
Causes for Rejection
Gross lipemia (may yield erroneously high free testosterone results); plasma specimen; gross hemolysis and/or gross icterus cause for rejection of direct free testosterone; improper labeling
LOINC® Map
| Order Code | Order Code Name | Order Loinc | Result Code | Result Code Name | UofM | Result LOINC |
|---|---|---|---|---|---|---|
| 070195 | Testosterone, Free+Total LC/MS | 58952-3 | 070036 | Testosterone, Total, LC/MS | ng/dL | 2986-8 |
| 070195 | Testosterone, Free+Total LC/MS | 58952-3 | 144981 | Free Testosterone(Direct) | pg/mL | 2991-8 |
| Order Code | 070195 | |||||
| Order Code Name | Testosterone, Free+Total LC/MS | |||||
| Order Loinc | 58952-3 | |||||
| Result Code | 070036 | |||||
| Result Code Name | Testosterone, Total, LC/MS | |||||
| UofM | ng/dL | |||||
| Result LOINC | 2986-8 | |||||
| Order Code | 070195 | |||||
| Order Code Name | Testosterone, Free+Total LC/MS | |||||
| Order Loinc | 58952-3 | |||||
| Result Code | 144981 | |||||
| Result Code Name | Free Testosterone(Direct) | |||||
| UofM | pg/mL | |||||
| Result LOINC | 2991-8 |