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Testosterone, Total & Free, Females or Children

Mnemonic:    [Test F F/T]
Name:    Testosterone, Total & Free, Females or Children
Specimen:    1 mL serum from a Red SST or Red top tube, or plasma from a Green PST. Recommendation: Collect specimen between 6-10 AM.

EDTA plasma is unacceptable.
Minimum Spec:    0.8 mL
Transport Temp:    Refrigerated
Spec Stability:    Stable 7 days refrigerated.
Ref Lab/Code:    ARUP 0081056
  Method:    HPLC/TMS/EC Immunoassay
Note:    This test is recommended for women and children (<19 years) due to an improved sensitivity of testosterone by LC-MS/MS.

Includes: Free & Total Testosterone as well as Sex Hormone Binding Globulin. The concentration of Free Testosterone is derived from a mathematical expression based on constants for the binding of Testosterone to Sex Hormone Binding Globulin.