. 2017 Sep 28;7(5):455–459. doi: 10.3892/br.2017.992

Table II.

Mean values of thyroid hormone in normal pregnant women.

Gestational weeks	n	FT3 (ng/l)	FT4 (ng/dl)	TSH (µIU/ml)
8–14	849	2.93±0.40^a	0.82±0.14^a	1.51±1.16^a
15–20	1,655	2.74±0.33^a	0.71±0.10^a	1.86±1.04^a
21–36	1,247	2.63±0.30^a	0.61±0.10^b	2.10±1.11^a
≥37	1,152	2.27±0.30^a	0.61±0.10^b	2.48±1.40^a
Total	4,903	2.63±0.39	0.68±0.13	2.00±1.21

P<0.05 vs. values denoted with.

From the 8–14 to the ≥37 group, the concentrations of maternal serum FT3 and FT4 reduced, whereas TSH levels were increased in normal pregnant women, except for the FT4 levels in the 21–36 week group were equivalent to that of the ≥37 weeks. Data are presented as mean ± standard deviation. FT3, free triiodothyronine; FT4, free thyroxine; TSH, thyroid stimulating hormone.