T4 (THYROXINE)

Code
600.3550
Name
T4 (THYROXINE)
Category
None
Department
Chemistry
Start Date
Expiration Date
Synonyms
Total Thyroxine
CPT Codes
84436
Site
Main Lab
Reference Test
ATLAS Test Code

Specimen Information

Type

Gold, SST

Volume

1.0 ml

Transport Info

Refrigerated
7 day stability

Frozen (Freeze Only once)
1 month stability

Fasting Required?
False
Patient Instructions

Reference Range

See Report

Methodology

Chemiluminescence

Clinical Significance

Used in the diagnosis and treatment of thyroid disorders.

Thyroxine (T4) is the most abundant iodothyronine in thyroglobulin. The majority of circulating triiodothyronine (T3) is formed following mono-deiodination of T4 in the peripheral tissues. In serum, T4 is bound to thyroxine-binding globulin (TBG), thyroxine-binding prealbumin (TBPA), and albumin. The serum free T4 concentration is less than 0.1% of the total T4 concentration.

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