Table 2 Trimester specific reference ranges of thyroid function TSH, FT3, FT4
Trimester | n | Minimum | Maximum | Mean ± SD | Percentiles | ||
|---|---|---|---|---|---|---|---|
2.5th | 50th (Median) | 97.5th | |||||
TSH mIU/mL | |||||||
First | 133 | 0.140 | 4.575 | 1.376 ± 0.982 | 0.168 | 1.229 | 4.294 |
Second | 153 | 0.185 | 4.922 | 1.623 ± 1.041 | 0.258 | 1.322 | 4.584 |
Third | 150 | 0.194 | 5.016 | 1.644 ± 0.994 | 0.341 | 1.433 | 4.625 |
FT3 pmol/L | |||||||
First | 133 | 1.533 | 5.590 | 2.906 ± 0.636 | 1.857 | 2.842 | 4.408 |
Second | 153 | 1.854 | 5.593 | 2.791 ± 0.646 | 1.958 | 2.631 | 4.621 |
Third | 150 | 1.964 | 5.182 | 2.842 ± 0.674 | 2.025 | 2.713 | 4.821 |
FT4 pmol/L | |||||||
First | 133 | 8.137 | 19.349 | 13.152 ± 2.391 | 8.815 | 12.876 | 18.006 |
Second | 153 | 7.417 | 17.561 | 11.703 ± 2.404 | 8.306 | 11.450 | 17.341 |
Third | 150 | 7.057 | 18.201 | 10.365 ± 2.326 | 7.402 | 9.463 | 17.292 |