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Test Code T4 T4 (Thyroxine), Total

Methodology

Electrochemiluminescence

Performing Laboratory

St. Clair Hospital Laboratory

Specimen Requirements

Serum:  standard sampling tubes or tubes containing separating gel.

Plasma: Li-, Na-heparin and K3-EDTA.

Sample Stability:    8 days at 2 – 8 ºC

12 months at -20 ºC (±5) (Freeze ONLY once)

Reference Values

4.5-12.0 µg/dL

Day(s) Test Set Up

Monday through Sunday