Thyroid Conditions and Fertility: When Assessment May Be Helpful
The delicate interplay between thyroid hormones, menstrual regularity, ovulation, and early embryonic development.
Reviewed by Dr. Sushmitha, MBBS, MS (OBG)
October 2026 · Evidence-Based Healthcare
Thyroid hormones regulate the metabolic rate of almost every cell in the body, including the ovaries and endometrium.
Hypothyroidism (underactive thyroid) is particularly common in women and can elevate prolactin levels, disrupting the pulsatile secretion of GnRH and leading to irregular ovulation or luteal phase deficiency.
In reproductive medicine, clinical targets for Thyroid-Stimulating Hormone (TSH) are stricter than general population labs. For women actively trying to conceive or undergoing IVF, guidelines recommend maintaining TSH below 2.5 mIU/L.
Testing for thyroid peroxidase antibodies (anti-TPO) helps identify autoimmune thyroiditis (Hashimoto's), which may require close monitoring and levothyroxine supplementation during early pregnancy.
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Frequently Asked Questions
Yes. Levothyroxine is identical to the natural hormone produced by the body and is completely safe and essential for fetal brain development during pregnancy.