This test measures both TSH (Thyroid Stimulating Hormone) and unbound or Free T4 (Free Thyroxine). TSH is produced by the pituitary gland and aids the thyroid gland in producing T4. Free T4 is the form of the hormone which is not bound to carrier proteins in the bloodstream. Because protein levels may fluctuate, Free T4 can be more accurate than a regular T4 test in some circumstances. Because the production of TSH and T4 hormones are linked, they are often evaluated together. Healthy thyroid levels play an important part in maintaining the body's systems and metabolism. Abnormal TSH or Free T4 levels can be caused by disorders which affect the thyroid gland.
Common symptoms of thyroid disorders include but are not limited to anxiety, irregular weight gain or loss, insomnia, diarrhea, constipation, irritation or sensitivity in the eyes, increased heart rate, dry skin, hair loss, and menstrual irregularity in women.
The TSH and Free T4 test is one of the most commonly ordered tests to check for healthy thyroid function. People experiencing symptoms associated with thyroid disorders often order these tests to check their hormone levels. TSH and Free T4 are also often ordered by women experiencing fertility issues.
Turnaround time for the TSH and Free T4 test is typically 1 business day.
Note: Result turn around times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.
This TSH and Free T4 test has no fasting requirements. Collection should not occur during or after administration of heparin.
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