Thyroid I Profile (TU, T4, T7)

Test Code: TD_117

CPT Code(s): 84479, 84436

$20

Test Details

Alternative Name(s)

Test Includes

T- Uptake
T4 (Thyroxine)
Corrected T4

Methodology

Roche COBAS electrochemiluminescent immunoassay (ECLIA)

Rejection Criteria

Allow only one freeze/thaw cycle

Reference Range(s)

Specimen Requirements

Preferred Specimen

Serum separator tube (SST)

Minimum Volume

2 mL for each sample collected

Sample Stability

1 day room temperature
1 week refrigerated
1 month frozen

Transport Temperature

Refrigerated

Collection Instructions

2 mL serum. Allow SST to clot in an upright position for
at least 30 minutes, then centrifuge sample within 2 hours
of collection. Refrigerate.
Do not collect samples from patients receiving therapy
with high biotin doses (>5 mg/day) until at least 8 hours
following the last biotin administration.

Alternative Specimen

N/A