Free 5-α-dihydrotestoterone
19 days
Equilibrium dialysis, high-performance liquid chromatography/tandem mass spectrometry (HPLC/MS-MS)
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Free DHT measured by mass spectrometry. Useful in detailed androgen evaluations.
Serum (preferred) or Plasma
3 mL
Red-top tube, gel-barrier tube, or green-top (heparin) tube
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
This test does not require any special collection or pre-analytical handling. Follow routine specimen collection protocols.
| Temperature | Period |
|---|---|
| Room temperature | 14 days |
| Refrigerated | 14 days |
| Frozen | 14 days |
| Freeze/thaw cycles | stable x6 |