For diagnosis of hypothyroidism and hyperthyroidism. Free thyroxine (free T4) tests are used to help evaluate thyroid function and diagnose thyroid diseases, including hyperthyroidism and hypothyroidism, usually after discovering that the thyroid stimulating hormone (TSH) level is abnormal.
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- Fasting Required: NO
- Preferred Specimen: Serum
- Reference Range(s):
<1 Month Not established 1-23 Months 0.9-1.4 ng/dL 2-12 Years 0.9-1.4 ng/dL 13-20 Years 0.8-1.4 ng/dL >20 Years 0.8-1.8 ng/dL
- Turnaround Time: 3 Days
- Test Code: 866