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For hours, walk-ins and appointments.Testosterone, Free, Direct With Total Testosterone, LC/MS-MS
CPT:
84402; 84403
Special Instructions
State patient's age and sex on the test request form.
Expected 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.
Related Documents
For more information, please view the literature below.
Frequently Asked Questions: Testosterone by Mass Spectrometry − New Profiles
Testosterone: Aiding in the Diagnosis of Androgen Dysfunction and Hypogonadism
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
Serum should be transferred from cells within one hour of collection and transferred to a plastic transport tube.
Storage Instructions
Room temperature
Stability Requirements
| Temperature | Period |
|---|---|
| Room temperature | 7 days |
| Refrigerated | 7 days |
| Frozen | 14 days |
| Freeze/thaw cycles | Stable x3 |
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
|
|
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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 |
Test Details
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)
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.
Methodology
Free: Direct analog enzyme immunoassay (EIA); Total: liquid chromatography/tandem mass spectrometry (LC/MS-MS)
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