For diagnosis of hypothyroidism and hyperthyroidism. T4 is a hormone that plays a role in several body functions, including growth and metabolism.
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- Fasting Required: NO
- Preferred Specimen: Serum
- Limitations: Nonthyroidal chronic diseases, nicotinic acid and nutrition may decrease results. Thyrotoxicosis may not always cause abnormal results. Binding protein variations may cause variations in results. Increases may be associated with pregnancy or oral contraceptive use.
- Reference Range(s):
T4 (Thyroxine), Total 4.5-12.0 mcg/dL Free T4 Index (T7) 1.4-3.8
- Turnaround Time: 3 Days
- Test Code: 867