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Table 1 Reference values of TSH and T4 in each trimester of pregnancy according to laboratory criteria

From: Adherence to treatment for hypothyroidism in pregnancy and relationship with thyrotropin control: a retrospective observational cohort study

Trimester

TSH (nmol/L)

T4l (nmol/L)

First

0.50–3.70

6.70–16.30

Second

0.31–4.35

5.80–13.90

Third

0.41–5.18

6.10–15.80

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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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