The #1 Hormone Women Aren’t Testing – The Best Way to Protect Fertility & Pregnancy

7 Aug 2025 · 13 min
13:12

McCall McPherson explains why thyroid testing matters for fertility and pregnancy. Subclinical hypothyroidism and autoimmune thyroid disease raise miscarriage risk and hurt embryo quality. TSH alone misses the problem; you need free thyroid hormones and antibodies tested, plus progesterone monitoring at 100–200 mg vaginally, and levothyroxine doses increased about 30% during pregnancy.

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