FREE TESTOSTERONE INDEX

Test Code

TFRI

CPT Codes
84270, 84403

Includes

Includes: Total Testosterone, Calculated Free Testosterone Index, and Sex Hormone-binding Globulin

Preferred Specimen

1 Gold tube (gel separator)

Minimum Volume

0.5 mL

Other Acceptable Specimens

or 1 Green tube (Lithium Heparin)

Instructions

Centrifuge for complete separation of plasma/serum and red cells. See Specimen Container for appropriate sample type. Separate and refrigerate until tested.

Specimen Stability

2-8°C up to 3 days; -20°C up to 1 month

Methodology
ECLIA (EIA by Chemiluninescence)

Setup Schedule

M, T, W, Th, F, Sa, Sun

Reference Range

Sex Hormone Binding Globulin

Male 20-50 years: 13.3 - 89.5 nmol/L

Male >50 years: 16.8 - 125.0 nmol/L

Female 20-46 years: 18.2 - 135.5 nmol/L

Female >46 years: 16.8 - 125.2

Testosterone, Total

Male: 175.0 - 781.0 ng/dL

Female: 10.0 - 75.0 ng/dL

Free Testosterone Index

Male 20-49 years: 35.0 - 92.6

Male >50 years: 24.3 - 72.1

Female 21-49 years: 0.30 - 5.62

Female >50 years: 0.19 - 3.63

Performed By
Alverno Laboratories

Performing Laboratory
Alverno Central Lab
NCHB2 (Chemistry, Beckman DxI)

Last Updated: April 25, 2023

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.