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. 2021 Jul 16;12:705567. doi: 10.3389/fendo.2021.705567

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Copyright © 2021 Lamine, Camponovo, Baud, Werner, Marino and Sykiotis

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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Time course of serum levels of hCG (□), TSH (▲), fT4 (●) and fT3 (○). FLC performed in the setting of TTTS led to resolution of hyperthyroidism within 1 week along with a rapid decrease in hCG levels. Hormones were measured by ECLIA (electrochemiluminescence immunoassay) on cobas e602 (Roche Diagnostics, Rotkreuz, Switzerland). Reference ranges (not trimester-specific): TSH, 0.270-4.20 mUI/l; fT4, 12-22 pmol/l; fT3, 3.1-6.8 pmol/l.