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. 2022 Feb 21;13:772801. doi: 10.3389/fendo.2022.772801

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Copyright © 2022 Trouva, Alvarsson, Calissendorff, Åsvold, Vanky and Hirschberg

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Thyroid status of all participants at inclusion in 1st trimester. Continuous lines represent the first trimester reference range recommended by ATA 2017 for TSH and reference limits for non-pregnant individuals for fT4.