T4 (Thyroxine), Total

Additional Information:

EPIC Test Name: T4 (THYROID HORMONE)

CPT Code(s):

84436

Collection Procedure:

Collect specimen in SST tube. Allow to clot. Centrifuge and store refrigerated. Transport to lab.

Specimen Requirements:

Type: Serum (preferred) or Plasma
Container/Tube: SST or Lithium Heparin (Green top)
Sample Volume: 1 mL
Minimum Volume: 0.2 mL (Repeat testing is not possible with this specimen volume.)
Storage: Refrigerate
Stability (collection to time of analysis/testing):

  • Refrigerated: 7 days
  • Frozen: 2 months

Methodology:

Solid-phase, competative chemiluminescent enzyme immunoassay

Reported:

1-3 days

Reference Values:

4.5 - 12.5 μg/dL

Performed:

Monday - Friday