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Table 2 Thyroid Hormone and Thyroid Antibody Values According to Pregnancy Trimester

From: Thyroid hormones according to gestational age in pregnant Spanish women

  Pregnancy
Thyroid Hormones/Antibodies First Trimester
(<14 weeks)
(n = 481)
Second Trimester
(14 to 28 weeks)
(n = 243)
Third Trimester
(>28 weeks)
(n = 297)
  Mean Median 2.5th %ile 97.5th %ile Mean Median 2.5th
%ile
97.5th
%ile
Mean Median 2.5th
%ile
97.5th
%ile
Thyroid-stimulating hormone
(μUI/mL)
1.08 ± 0.69 0.94 0.41 2.63 1.20 ± 0.62 1.13 0.15 2.59 1.39 ± 0.75 1.29 0.28 3.48
Free triiodothyronine
(pg/mL)
3.41 ± 0.53 3.42 2.33 4.37 3.33 ± 0.45 3.34 2.42 4.20 3.22 ± 0.52 3.24 2.25 4.17
Free thyroxine
(ng/dL)
1.08 ± 0.14 1.08 0.84 1.38 0.94 ± 0.12 0.94 0.70 1.16 0.90 ± 0.13 0.89 0.62 1.17
Thyroid peroxidase antibodies
(UI/mL)
0.15 ± 0.26 0.08 0.00 0.74 0.16 ± 0.25 0.09 0.00 0.89 0.19 ± 0.43 0.09 0.00 1.20
Thyroglobulin antibodies
(UI/mL)
1.05 ± 0.65 0.83 0.40 3.12 0.95 ± 0.62 0.76 0.34 2.65 0.89 ± 0.51 0.76 0.38 2.48