Sample Requirements:
1 SST tube
Purpose:
Measures total thyroxine (T4) to assess thyroid function.
High Levels:
Indicates hyperthyroidism.
Low Levels:
Indicates hypothyroidism.
Reference Range:
4.5–12.5 µg/dL
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All Lab Tests
T4, Total
Test Code:
PDL0508
Division:
Special Chemistry
CPT Code:
84436
Sample Type:
Serum