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.
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
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