Thyroid hormones help regulate your metabolism and reproductive function. An underactive or overactive thyroid can disrupt menstrual cycles and ovulation.

Does everyone need testing?
Not necessarily. Discuss testing with your healthcare provider if you have irregular periods, symptoms of thyroid disease, a personal or family thyroid history, difficulty conceiving, or repeated pregnancy losses.

What do the tests measure?
TSH reflects how strongly your brain signals the thyroid to work. Free T4 measures available thyroid hormone. Thyroid antibody testing may be useful in selected cases, but is not routinely needed for everyone.

Does a slightly high TSH mean you need medication?
No. A TSH above 2.5 mIU/L alone does not automatically mean thyroid disease or a need for treatment. Interpretation depends on the laboratory range, Free T4, pregnancy status and medical history. Mild abnormalities may need repeat testing.

What if you already take thyroid medication?
Arrange a review before conception and contact your prescriber promptly after a positive pregnancy test. Your dose and monitoring needs may change.

Thyroid testing is one part of a fertility assessment—not a measure of egg quality or a guarantee of pregnancy.

Longevity Fertility Centre | Calgary & Edmonton