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Thyroid, Infertility + Miscarriage
1 in 5 women with miscarriage or fertility struggles have subclinical hypothyroidism. Learn why optimal thyroid health matters and how naturopathic care helps.
Written and medically reviewed by Dr. Courtney Ranieri, ND, a licensed naturopathic doctor registered with the College of Naturopaths of Ontario (Reg. #3726). Last reviewed July 2026.
A study has found that 20% of women (1 in 5) with a history of miscarriage or difficulty getting pregnant have subclinical hypothyroidism.
This is the perfect example of why you want your health to be 'optimal', not just 'within the normal range'.
Subclinical hypothyroidism is defined as under-active thyroid function where thyroid hormone values are still within the 'normal range' on lab-work, but not within an 'optimal range'.
Women falling within this 'normal range' would not normally be considered for thyroid hormone treatment
However, both the Endocrine Society and the American Reproductive Society suggest that women who have a TSH greater than 2.5 mIU/L and/or are thyroid antibody positive should be considered for treatment with thyroid medication if there is a history of miscarriage or infertility.
Subclinical hypothyroidism has also been associated with preterm birth and preeclampsia.
How Naturopathic Fertility Support Can Help
I provide Fertility Support to help patients through pre-conception care, pregnancy and beyond. By looking at fertility through a holistic lens, we work towards a comprehensive plan that takes into account all aspects of health and its effect on fertility.
- An Individualized Treatment Plan to address underlying concerns (PCOS, endometriosis, fibroids, thyroid), understand your fertile window, improve egg and sperm health, optimize nutrition, balance hormones, and support integrative fertility methods.
- Preconception Check-Up. We talk about your goals, reproductive and health history, cycles, and conditions that may make it difficult to conceive.
- Comprehensive Lab Testing including Estrogen, LH:FSH ratio, Progesterone, Insulin and/or HbA1C, TSH, and AMH.
- Pelvic Floor Therapy. Pre and post-natal support.
- Integrative Fertility Support alongside IVF, IUI and cycle monitoring.
- Equal Access for All. LGBTQ2S friendly services and equal access for all.
Book your fertility support appointment here.
About the author
Dr. Courtney Ranieri, ND is a board-licensed naturopathic doctor and the founder of Somewhere Health. She earned her Doctor of Naturopathic Medicine at the Canadian College of Naturopathic Medicine in Toronto and holds an Honours Bachelor of Science from the University of Western Ontario. Her clinical focus spans hormonal health, fertility, digestion, and women's health, with advanced training in pelvic floor therapy and integrative fertility care.
