A physical exam may show signs of hypothyroidism, such as dry skin, a slow pulse, or slowed reflexes. Your health history may show symptoms of weight gain, tiredness, and constipation.
The best screening tool is a blood test that measures thyroid-stimulating hormone (TSH). A high level of TSH points to hypothyroidism. If this is high, then your doctor may order a free thyroxine (FT4).
Jonklaas J, Bianco AC, Bauer AJ, et al. Guidelines for the treatment of hypothyroidism. Thyroid. 2014 Dec;24(12):1670-751.
Hypothyroidism (underactive thyroid). National Institute of Diabetes and Digestive and Kidney Diseases website. Available at: https://www.niddk.nih.gov/health-information/endocrine-diseases/hypothyroidism. Updated August 2016. Accessed May 20, 2019.
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