Table 3.

Trimester-specific TSH reference ranges in different populations.

Population	TSH reference range (mIU/l)
	1st trimester	2nd trimester	3rd trimester
USA	0.1–2.5	0.2–3.0	0.3–3.0
Chinese	0.03–4.51	0.05–4.50	0.47–4.54
Indian	0.6–5.0	0.44–5.78	0.74–5.7
Mixed (Dutch, Turkish, Moroccan, Surinamese)	0.06–4.51	Not mentioned	Not mentioned

Adapted from: De Groot et al. [2012]; Korevaar et al. [2013]; Li et al. [2014]; Marwaha et al. [2008]; Negro and Stagnaro-Green [2014]; Stagnaro-Green et al. [2011]; Yan et al. [2011].

mIU, milli-international unit; TSH, thyroid stimulating hormone.