Reference Intervals of Thyroid Hormones and Correlation of BMI with Thyroid Function in Healthy Zhuang Ethnic Pregnant Women

Table 1

The reference ranges for TSH, FT4, and FT3 in three trimesters of Zhuang ethnic pregnant women.

Trimesters	n	TSH(mIU/L)	FT4(pmol/L)	FT3(pmol/L)
1st	819	0.84 (0.02-3.28)	14.67 (10.57-19.76)	4.45 (3.51-5.64)
2nd	1909	1.17 (0.03-3.22)	14.29 (10.05-19.23)	4.33 (3.42-5.42)
3rd	596	1.59 (0.08-3.71)^#	13.31 (8.96-17.75)^#	3.93 (2.93-5.03)^#
Manufacturers		0.55-4.78	11.50-22.70	3.50-6.50

The TSH, FT4, and FT3 levels were expressed as median and reference interval (2.5 and 97.5 percentiles) since they were nonnormal distribution, Kolmogorov-Smirnov test.Compared with 1st trimester, p < 0.05; ^#compared with 2nd trimester, p < 0.05, Mann–Whitney U test.