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.

Storage Instructions:

Freeze

Stability Requirements:

Temperature

Period

Room temperature

7 days

Refrigerated

7 days

Frozen

19 months

Freeze/thaw cycles

Stable x6

 

 

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