Item Value
Test name Thyroid Stimulating Hormone
Available Stat? No
Turn around times 0 -2 days
In House Availability Test performed Monday-Saturday (day shift)
Performed by Chemistry China Basin
Normal range
Age Reference range (mIU/L)
<2 months 1.12-6.31
2 months to <6 months 0.73-4.77
6 months to <14 years 0.70-4.17
14 years to <18 years 0.47-3.41
18 years and above 0.45-4.12


Reference ranges apply to non-pregnant individuals. In pregnant subjects, TSH levels decline in the first trimester and then rise after 10 -12 weeks gestation. The upper reference limit is 2.5 mIU/L in the first trimester, 3.0 in the second trimester, and 3.5 mIU/L in the third trimester. The lower reference limit for TSH in pregnancy is 0.1 – 0.2 mIU/L lower than the range limit in non-pregnant subjects (Garber JR et al. Clinical Practice Guidelines for Hypothyroidism in Adults: American Association of Clinical Endocrinologists and the American Thyroid Association, Thyroid 12:1200-1235, 2012).

Pediatric reference ranges adopted from Pediatric Reference Intervals seventh edition (Soldin, Steven J. et al) and the Canadian Laboratory Initiative on Reference Interval Database (CALIPER) study, Clinical Chemistry September 2013 vol. 59 no. 9 1393-1405.

Neonatal and cord blood levels are 2-4x higher than levels at ≥ 2 weeks of age through adult life. Neonatal levels are also screened by the State program.

Adult reference ranges were adopted from NHANES III and verified in 63 adult blood donors (Hollowell JG et al. Serum TSH, T4, and thyroid antibodies in the United States population ,1988 to 1994: National Health and Nutrition Examination Survey , NHANES III. J Clin Endocrinol Metab 87:489–499, 2002. Garber JR et al. Clinical Practice Guidelines for Hypothyroidism in Adults: American Association of Clinical Endocrinologists and the American Thyroid Association, Thyroid 12:1200-1235, 2012).
Container type Gold top or Light Green top
Amount to Collect 1.6 mL blood
Sample type Serum or heparinized plasma

If you have additional questions regarding this test, please call: 415-353-1667