Laboratory Testing
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TSH, Free T3, Free T4, Reverse T3, Thyroid Peroxidase Antibodies (Anti-TPO), Thyroglobulin Antibody
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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
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LabCorp Test #: 141325, CPT: 83951
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LabCorp Test #: 336624, CPT: 85384; 85385; 85635; 85670
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Genova Diagnostics Test Code: 3200
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LabCorp Test #: 503380, CPT: 82397
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LabCorp Test #: 140731; CPT: 84153
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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
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