Testost., % Free+Weakly Bound

Understand what Testost., % Free+Weakly Bound signals

Primary unit: %
LOINC codes: 58716-2
Commercial laboratory assays: 2

We have not added a physiological summary for this biomarker yet. Compare the commercial laboratory assays and population reference ranges below.

Compare commercial laboratory assays for Testost., % Free+Weakly Bound

Check orderable catalog codes, specimen types, fasting requirements, and demographic reference ranges across laboratories.

Testosterone, Free and Weakly Bound

Laboratory: Labcorp
Test code: 143255
Specimen: Serum
Fasting: Not stated
LOINC: 58716-2
Turnaround: 1 - 6 days

Laboratory assay overview

Free and weakly bound testosterone (FWBT), also referred to as bioavailable testosterone, is thought to reflect an individual's biologically active, circulating testosterone. FWBT includes free testosterone and testosterone that is bound to albumin. FWBT does not include sex hormone binding globulin-bound testosterone. The SHBG-bound fraction is biologically inactive because of the high binding affinity of SHBG for testosterone. The rapid dissociation of “weakly bound” testosterone from albumin results in the availability of essentially all albumin-bound testosterone for steroid-receptor interaction.1

View complete laboratory reference notes

• % free and weakly bound: male: 9.0% to 46.0%, female: 3.0% to 18.0% • Free and weakly bound: male: 40.0−250.0 ng/dL, female: 0.0−9.5 ng/dL

Labcorp test directory, test code 143255

Testosterone, Free and Weakly Bound, With Total Testosterone, LC/MS-MS

Laboratory: Labcorp
Test code: 070282
Specimen: Serum
Fasting: Not stated
LOINC: 58716-2
Turnaround: 4 - 6 days

Laboratory assay overview

Free and weakly bound testosterone (FWBT), also referred to as bioavailable testosterone, is thought to reflect an individual's biologically active, circulating testosterone. FWBT includes free testosterone and testosterone that is bound to albumin. FWBT does not include sex hormone-binding globulin-bound testosterone. The SHBG-bound fraction is biologically inactive because of the high binding affinity of SHBG for testosterone. The rapid dissociation of "weakly bound" testosterone from albumin results in the availability of essentially all albumin-bound testosterone for steroid-receptor interaction.1

Labcorp test directory, test code 070282

Verify these ranges and sources

We compile every detail above directly from named laboratory directories and published clinical studies. Laboratories calculate standard reference intervals from the statistical distribution of tested populations for a specific assay method and demographic group, rather than setting universal optimal targets.

Always review your personal lab results with a licensed clinician, or track your lab history and health goals in Aumnivida.

Spotted an error? Email hello@biomarkerlens.com with the page URL and the primary source that corrects the entry.