**NOTE: All laboratory testing requires an authorizing physician in order to complete the laboratory testing.**
TSH (thyroid stimulating hormone) is the most common test used to evaluate thyroid function and symptoms related to a thyroid disorder such as hyperthyroidism, or hypothyroidism. Produced by the pituitary gland, the primary role of TSH in the body is to stabilize amounts of T4 (thyroxine) and T3 (triiodothyronine) in the blood. This process controls how much energy the body burns.
The TSH test is often ordered to:
Symptoms related to hyperthyroidism include anxiety, weight loss, shaking, weakness, sensitivity to light, or eye problems (swollen eyes, irritation/dryness).
Symptoms related to hypothyroidism include swollen skin, tiredness/fatigue, hair loss, weight gain, dry skin, or irregularity with menstruation in women.
Individuals who are being treated for a thyroid disorder often have the TSH test ordered at regular intervals. It is also ordered when an individual has an adjustment in their thyroid medication. The American Thyroid Association recommends that patients wait 6-8 weeks after adjusting medication before they retest thyroid stimulating hormone levels.