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Testosterone, Free

Source Blood
Mnemonic TESTOBIOFR
Specimen Requirements

Free Testosterone is NO CHARGE.
When both Free and Bioavailable Testosterone are ordered together, the patient will pay one fee of $50.00 for Bioavailable Testosterone.

1 x 3.5 mL gold top SST tube

1 mL serum

Recommend collecting blood between 07:00 and 10:00.

Specimen Handling
Additional Information

Free Testosterone and Bioavailable Testosterone will both be reported.

The concentration of Free Testosterone is derived from a mathematical expression based on constants for the binding of Testosterone to Sex Hormone Binding Globulin and Albumin.
Testing Location Immunochemistry
Testing Frequency Weekdays
Alternate Name(s) Free Testosterone
Reference Interval

Adult male

175-700 pmol/L

Adult female

2-30 pmol/L