Sample Requirements:
SST tube. No fasting required.
Purpose:
Measures free thyroxine; used in thyroid disease assessment.
High Levels:
Hyperthyroidism.
Low Levels:
Hypothyroidism.
Reference Range:
0.8–1.8 ng/dL
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All Lab Tests
Free T4
Test Code:
PDL0157
Division:
Chemistry
CPT Code:
84439
Sample Type:
Serum