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Test Compendium

7801: TESTOSTERONE, TOTAL AND FREE(FTI)

Test Code

  • 7801

Test Synonym

  • FREE AND TOTAL TESTOSTERONE, TOTAL AND FREE TESTOSTERONE

Volume

  • 1 mL

Minimum Volume

  • 0.5 mL

Specimen Requirements

  • Serum

Container

  • Serum Separator Tube, Plain Red Top Tube, Transfer Tube- Serum

Storage

  • Refrigerated

Turn Around Time

  • 1 day

Special Instructions

  • 1 SST

Additional Information

  • This test includes Total Testosterone and Sex Hormone Binding Globulin (SHBG). The Free Testosterone Index (FTI) or Free Androgen Index is derived from a mathematical calculation using the Testosterone, Total expressed as nmol/L and the Sex Hormone Binding Globulin (SHBG). It is a rough guide to free testosterone levels, this test has limitations as a measurement and may be more useful in women.

Specimen Stability

  • 3 days at 2-8 °C, 1 months at -20 °C. Freeze only once.

Reference Range

  • Fasting Sex Message Lines Ref Ranges Unit of Measure
    F Adult Females < 49 yrs 0.297 - 5.62 Adult Females > 49 yrs 0.187 - 3.63 Index
    M Adult Males < 49 yrs 35.0 - 92.6 Adult Males > 49 yrs 24.3 - 72.1 Index