Bioavailable Testosterone Panel

Test Overview

Test Methodology

Bioavailable Testosterone calculated using the Vermeulen equation.

Reference Range *

Bioavailable Testosterone: Males Ages 20 – 69, 1.1 – 4.0 ng/mL; Female Ages 20 – 80, 0.01 – 0.19 ng/mL. All other non-specified age ranges do not have established reference ranges. Refer to Total Testosterone (male, female or pediatric) and Sex Hormone Binding Globulin Handbook entries for reference ranges.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details

Days Set Up

Male: daily; Female and Pediatric: varies; 2-3 times per week

Analytic Time

1 - 4 days

Soft Order Code

TTBSM (Male)/TTBSP (Pediatric and Female)

MiChart Code

Bioavailable Testosterone, Males; Bioavailable Testosterone, Pediatrics and

Synonyms

TTBS
Free Testosterone
Testosterone Binding Index
FT
Bioavailable Testosterone
BIOTEST
Testosterone, Bioavailable and Total
TTBSM
TTBSP

Laboratory

Chemical Pathology

Section

Automation

Specimen Requirements

Collection Instructions

Refer to Total Testosterone (male, female or pediatric) and Sex Hormone Binding Globulin Handbook entries. There is no additional specimen required for the Bioavailable Testosterone calculation.
Male: Collect blood in an SST tube. Centrifuge, aliquot serum into a plastic vial, and refrigerate.
Female and Pediatric: Collect blood in a red top tube. Centrifuge, aliquot serum into a plastic vial, and refrigerate