Thyroid Function in Pregnancy Calculator
Assess TSH levels by trimester.
Thyroid Function in Pregnancy Form
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Understanding Your Results
TSH reference ranges vary by trimester. First trimester TSH is typically 0.1–2.5 mU/L, while second and third trimesters allow up to 3.0 mU/L.
Frequently Asked Questions
Why does thyroid function change in pregnancy?
Pregnancy increases thyroid hormone production and alters binding proteins. Trimester-specific reference ranges are needed.
What are normal TSH levels in pregnancy?
First-trimester TSH is typically lower, often with an upper limit around 2.5–3.0 mIU/L. Ranges vary by trimester and laboratory.
Can hypothyroidism affect my baby?
Untreated hypothyroidism is associated with adverse outcomes including preterm birth, preeclampsia, and neurodevelopmental impairment.
How often should thyroid be checked during pregnancy?
TSH is usually checked at the first prenatal visit and every 4–6 weeks during the first half of pregnancy, or as clinically indicated.
Book a telemedicine consultation or lab review with Dr. Taimoor Asghar.