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Table 2 Comparison of Thyroid function parameters in different gestation

From: Evaluation of median urinary iodine concentration cut-off for defining iodine deficiency in pregnant women after a long term USI in China

Gestation N FT3 (pmol/L) FT4 (pmol/L) TSH (mIU/L) SI (μg/L) TG (μg/L)
6th 79 4.74 ± 0.52 16.01 ± 2.00 1.48 ± 0.65
12th 79 4.44 ± 0.56a 15.38 ± 1.97a 1.08 ± 0.70a 80.11 ± 15.72 8.91(6.83~15.22)
24th 78 3.90 ± 0.36ab 12.59 ± 1.51ab 1.58 ± 0.63b 68.99 ± 13.39b 7.74(5.03~12.98)b
32th 78 3.94 ± 0.78ab 12.62 ± 1.84ab 1.74 ± 0.73abc 69.14 ± 15.75b 9.92(6.19~16.33)c
F   50.36 132.61 32.61 38.39 14.24
P value   < 0.0001 < 0.0001 < 0.0001 < 0.0001 < 0.0001
  1. FT3 Free Triiodothyronine, FT4 Free Thyroxine, TSH Thyroid Stimulating Hormone, SI serum iodine, TG thyroid globulin. ap < 0.05 between each trimesters with the 6th weeks; bp < 0.05 between each trimesters with the 12th weeks; cp < 0.05 between each trimesters with the 24th weeks