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T4 (Thyroxine), Total, Plasma or Serum*

Important Note

*This test is orderable in Cerner

Performing Laboratory

Rutland Regional Medical Center Laboratory

Specimen Requirements

Specimen Type: Blood
Container/Tube:

Preferred: Light-green top (lithium heparin gel)

Acceptable: Gold top, serum gel

Specimen Volume: Full tube

Specimen Minimum Volume: 2 mL

Collection Instructions:

1. Send specimen in original tube.

2. If there is a delay in transport of >1 hour, centrifuge tube.

Reference Values

4.5-13.9 µg/dL

Days Performed

Daily

Analytical Time:

1 day

Available Stat

Methodology

Enzyme Immunoassay (EIA)

Test Classification and CPT Coding

84436

Specimen Transport Temperature

Refrigerated