T4, Free and Total

Test Code

18612

CPT Codes
84436, 84439

Preferred Specimen

2 mL serum collected in a serum separator tube (SST®)

Minimum Volume

1 mL

Transport Container

Plastic screw-cap vial

Transport Temperature

Refrigerated (cold packs)

Specimen Stability

Room temperature: 7 days
Refrigerated: 7 days
Frozen: 30 days

Methodology
Enzyme Immunoassay (EIA)

Setup Schedule

Set up: Daily (all shifts); Report available: Same day

Reference Range

See Laboratory Report

Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.