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Test Code T4 T4 (Thyroxine)

Specimen Requirements

Container/Tube: GRN/SST
Preferred: Plasma
Acceptable: Serum
Specimen Volume: 1.0 mL

SPECIMEN PROCESSING and HANDLING

Complete clot formation should take place before centrifugation. Serum or plasma should be physically separated from cells as soon as possible. A maximum limit of two hours from the time of collection is recommended.

TRANSPORT TEMPERATURE

Serum and plasma samples may be stored for up to 5 days at 2–8 °C (36–46 °F) or 4 weeks at -20 °C (-4 °F).

PERFORMING LAB

WKMC, WKB, WKP, WKS