Dihydrotestosterone

Test ID:

706603

CPT code:

82642

Synonyms:

•Androstaner-3-one
•DHT
•Hydroxy-5α

Clinical Use:

Dihydrotestosterone and dihydrotestosterone/ratio may be used for differential diagnosis of diseases of sexual differentiation (DSD). DHT levels may be inappropriately low compared to testosterone levels in 5a-reductase deficiency. It is recommended by guidelines to measure the ratio of testosterone to DHT.

DHT levels may also be monitored to follow the effectiveness of 5a-reductase inhibitor treatment in female alopecia.

Specimen Type:

Serum (preferred) or plasma, frozen

Requested Volume:

1 mL

Minimum Volume:

0.5 mL

Container Type:

Red-top tube, gel-barrier tube, lavender-top (EDTA) tube, or green-top (heparin) tube

Collection:

Separate serum or plasma from cells within one hour of collection. Send serum or plasma in plastic transport tube. Transfer specimen to a plastic transport tube before freezing. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.