Test Name: TESTOSTERONE FREE PANEL
EPIC Search Term: LABFTESI
Synonyms: Sex Hormone Binding Globulin, Testosterone, Free Testosterone Index, FTESC, FTESI
Panel Composition: Sex Hormone Binding Globulin
Testosterone
Free Testosterone Index
Preferred Container: 1 x 3 mL Red/Black Serum Separator (SST) Vacutainer
Alternate Container: 1 x 3 mL Red No Additive Tube
Sample Type: Blood: Serum
Draw Volume: 3 mL
Minimum Volume: 3 mL
Testing Frequency: Monday to Friday with 12:30pm cut-off time
Expected Turn Around Time: Weekday: 48 hours, weekend and holiday: next business day
Clinical Application: This test is the alternative, second-level test for suspected increases or decreases in physiologically active testosterone. Free testosterone is not directly measured by equilibrium dialysis but derived from a calculation from the measured total testosterone and SHBG concentrations.
Methodology: Chemiluminescent Microparticle Immunoassay (CMIA)
Reference Ranges: Free Testosterone Index:

Female:
0-8 yrs: 0.0-1.3
9-13 yrs: 0.1-2.6
14-18 yrs: 0.6-6.5
>/= 19 yrs: 0.7-13.5

Male:
0-12 mos: 0.0-32.7
1-8 yrs: 0.0-0.6
9-13 yrs: 0.2-34.7
14-18 yrs: 3.6-83.3
>/=19 yrs: No reference range available
Test Performed By: Texas Children's Hospital Pathology Services

Available at TCH Main Campus: 832-824-5152
6621 Fannin, MC 1-2261
Houston, TX 77030-2399
Lab Section: Chemistry