Garber JR, Cobin RH, Gharib H, et al. Clinical practice guidelines for hypothyroidism in adults: cosponsored by the American Association of Clinical Endocrinologists and the American Thyroid Association. Endocr Pract. 2012;18(6):988-1028.
Low: <0.27 µlU/mL
Optimal: 0.27-4.20 µlU/mL
High: >4.20 µlU/mL
1.0 mL serum (0.5 mL minimum) collected in serum separator tube (SST/Tiger Top)