Thyroid Function in Pregnancy Calculator

Interprets TSH and free T4 values during pregnancy using trimester-specific reference ranges.

mIU/L (or µIU/mL)
Thyroid-stimulating hormone.
ng/dL or pmol/L
Optional but recommended for full interpretation.
Reference ranges are trimester-specific.
Positive TPO antibodies increase risk of hypothyroidism.
Target TSH differs if on treatment.

Enter values and click Calculate to see results

References

  1. 2017 Guidelines of the American Thyroid Association for the Diagnosis and Management of Thyroid Disease During Pregnancy. Thyroid Journal (2017). Link
  2. ACOG Guidelines at a Glance: Thyroid Disease in Pregnancy. ACOG / Contemporary OB/GYN (2020). Link