Laboratory Testing

TSH, Free T3, Free T4, Reverse T3, Thyroid Peroxidase Antibodies (Anti-TPO), Thyroglobulin Antibody

CBC, CMP-14, Lipid Panel, Testosterone Free Equilibrium Ultrafiltration With Total Testosterone, Estradiol extraction (ULTRASENSITIVE), DHEA-Sulfate, TSH, PSA, LH, Sex Hormone Binding Globulin, IGF-1 LC/MS

LabCorp Test #: 141325, CPT: 83951

LabCorp Test #: 086264, CPT: 85240

LabCorp Test #: 086314, CPT: 85270

LabCorp Test #: 336624, CPT: 85384; 85385; 85635; 85670

LabCorp Test #: 144600, CPT: 83088

LabCorp Test #: 144618, CPT: 83088

Genova Diagnostics Test Code: 3200

LabCorp Test #: 503380, CPT: 82397

LabCorp Test #: 140731; CPT: 84153

LabCorp Test #: 500016, CPT: 83520

LabCorp Test #: 143305, CPT: 84238

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