1 - 4 days
Testosterone Binding Index
Testosterone, Bioavailable and Total
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Bioavailable Testosterone calculated using the Vermeulen equation.
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.
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