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Test Directory

Test Directory Dihydrotestosterone

Dihydrotestosterone

Test Summary

DHT is a potent androgen derived from testosterone via 5-Alpha-Reductase activity. 5-Alpha-Reductase deficiency results in incompletely virilized males (phenotypic females). This diagnosis is supported by an elevated ratio of testosterone to DHT.

Aliases

Specimen Collection

Special Instructions

N/A

Preferred Specimen

1 mL serum collected in a red-top tube (no gel)

Minimum Volume

0.6 mL

Instructions

N/A

Patient Preparation

N/A

Storage

N/A

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 7 days
Refrigerated: 14 days
Frozen: 6 months

Limitations

N/A

Other Acceptable Specimens

N/A

Unacceptable Specimens

Moderate to gross hemolysis • Grossly icteric • Serum separator tube (SST) • Plasma

Order Code

DTEST

EPIC (Premier) Code

LAB5143

Includes

N/A

CPT Code

82642

Billing Code

670262

CPT Statement

Methodology

Chromatography/Mass Spectrometry

FDA Status

This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by the U.S. Food and Drug Administration. The FDA has determined that such clearance or approval is not necessary. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Physician Attestation of Informed Consent

N/A

Testing Laboratory

Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano CA, 92675

Department

Reference Testing

Reference Range

Female	≤20 ng/dL
Male	12-65 ng/dL

Setup Schedule / Expected Turnaround Time

Sunday - Friday; Report available: 2 - 5 days