Free and Bioavailable (calculated)

Panels that include this biomarker

• Testosterone, Free, Bioavailable and Total, Males (Adult), Immunoassay 30741

  5 analytes · Serum · Fasting not stated

  Method and collection

  Preparation

  Testosterone, Total, Males (Adult), Immunoassay: Due to changes in testosterone levels throughout the day, two morning (8:00-10:00 a.m.) specimens obtained on different days are recommended by The Endocrine Society for screening.

  Collection

  Dietary supplements containing biotin may interfere in assays and may skew analyte results to be either falsely high or falsely low. For patients receiving the recommended daily doses of biotin, draw samples at least 8 hours following the last biotin supplementation. For patients on mega-doses of biotin supplements, draw samples at least 72 hours following the last biotin supplementation.

  Reference notes

  Testosterone, Total, Males (Adult), Immunoassay Male 250-827 ng/dL Female Not applicable All test requests for Testosterone on female and pediatric (<18 years) patients must use test code 15983 - Testosterone, Total, MS. Albumin 3.6-5.1 g/dL Sex Hormone Binding Globulin Age Male (nmol/L) Female (nmol/L) <3 Years Not established Not established 3-9 Years 32-158 32-158 10-13 Years 20-166 24-120 14-17 Years 20-87 12-150 18-55 Years 10-50 17-124 >55 Years 22-77 14-73 Free Testosterone Age Male (pg/mL) Female 18-69 Years 46.0-224.0 Not applicable >69 Years 6.0-73.0 Not applicable Bioavailable Testosterone Age Male (ng/dL) Female 18-69 Years 110.0-575.0 Not applicable >69 Years 15.0-150.0 Not applicable

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