T4, FREE (FREE THYROXINE) | |
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Test Code: 151 | Specimen Collection: Serum |
Component: T4, Free | Method: IA |
Collection Notes: Serum is the recommended sample type for this assay. | |
Clinical Utility: Free T4 is measured together with TSH when thyroid function disorders are suspected. The determination of fT4 is also suitable for monitoring thyrosuppressive therapy. | |
CPT Code: 84439 | Testing Location: AML |
SPECIMEN/STABILITY TYPETemperature:Serum (1 mL) Ambient 8 Hours Refrigerated 5 Days Frozen 30 Days EDTA plasma (1 mL) Ambient 8 Hours Refrigerated 5 Days Frozen 30 Days Heparinized plasma (1 mL) Ambient 8 Hours Refrigerated 5 Days Frozen 30 Days |