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Also reported in: µIU/mL, mU/L
Your TSH (the signal hormone your brain sends to your thyroid) is within the normal reference range. This is a reassuring result for thyroid health.
Your TSH (the signal hormone your brain sends to your thyroid) is very low, indicating significant hyperthyroidism. Hyperthyroidism can impair fertility by disrupting ovulation, increasing miscarriage risk, and causing maternal and fetal complications during pregnancy. Urgent thyroid evaluation is needed.
Seek urgent endocrinology evaluation. Thyroid function tests (free T4 (the main thyroid hormone in your blood), free T3 (the active thyroid hormone your cells actually use)) and assessment for Graves' disease are needed. Hyperthyroidism must be treated before attempting conception.
TSH (the signal hormone your brain sends to your thyroid) very low — hyperthyroidism or thyroid hormone excess; fertility riskYour TSH (the signal hormone your brain sends to your thyroid) is below the fertility-optimal range. Subclinical hyperthyroidism can affect ovulation regularity and is associated with increased miscarriage risk. For conception, TSH ideally should be maintained above 0.5 mIU/L.
Discuss with your doctor. Thyroid function monitoring and possible dose adjustment if on thyroid treatment are recommended before attempting conception.
TSH (the signal hormone your brain sends to your thyroid) below optimal range — possible a mildly overactive thyroid (the early stage); fertility monitoring requiredYour TSH (the signal hormone your brain sends to your thyroid) is at the lower end of the normal range. While not abnormal, TSH below 1.0 mIU/L should be monitored in women planning pregnancy.
Discuss with your doctor or hormone specialist. Thyroid function monitoring is advisable.
TSH (the signal hormone your brain sends to your thyroid): low-normal — borderline for fertility optimizationYour TSH (the signal hormone your brain sends to your thyroid) is within the normal reference range. This is a reassuring result for thyroid health.
No specific action required.
TSH (the signal hormone your brain sends to your thyroid) within normal reference range — acceptable thyroid functionYour TSH (the signal hormone your brain sends to your thyroid) is in the optimal range for fertility and early pregnancy. Guidelines from most reproductive medicine societies recommend TSH below 2.5 mIU/L when trying to conceive, as slightly elevated TSH is associated with increased miscarriage risk.
No action needed. Excellent thyroid status for conception.
TSH (the signal hormone your brain sends to your thyroid) in optimal fertility range (0.5–2.5 mIU/L) — ideal for conception and early pregnancyYour TSH (the signal hormone your brain sends to your thyroid) is in the borderline-high range for fertility. TSH above 2.5 mIU/L in women trying to conceive is associated with modestly increased miscarriage risk and may impair implantation. Most reproductive medicine guidelines recommend treating TSH above 2.5 mIU/L in women with recurrent miscarriage or undergoing IVF.
Discuss with your reproductive hormone specialist or thyroid specialist. Levothyroid hormone therapy to bring TSH (the signal hormone your brain sends to your thyroid) below 2.5 mIU/L is often recommended when trying to conceive, particularly with anti-TPO antibody positivity.
TSH (the signal hormone your brain sends to your thyroid) 2.5–4.0 mIU/L — borderline for fertility; a mildly underactive thyroid (the early stage) may impair conceptionYour TSH (the signal hormone your brain sends to your thyroid) is above the range compatible with optimal fertility. Hypothyroidism impairs ovulation regularity, reduces implantation success, noticeably increases miscarriage risk, and affects fetal neurological development in early pregnancy. Treatment is needed before attempting conception.
Seek prompt endocrinology or primary care evaluation. Levothyroid hormone therapy to normalize TSH (the signal hormone your brain sends to your thyroid) below 2.5 mIU/L should be initiated before attempting conception. Retest TSH 4–6 weeks after starting treatment.
TSH (the signal hormone your brain sends to your thyroid) >4.0 mIU/L — hypothyroidism; fertility impairment and miscarriage risk elevatedYour TSH (the signal hormone your brain sends to your thyroid) is very high, indicating a clearly underactive thyroid. noticeable hypothyroidism profoundly impairs fertility and is associated with anovulation, complete cycle disruption, and very high miscarriage and fetal abnormality risk if pregnancy does occur. Conception should not be attempted until thyroid function is adequately treated.
Seek urgent endocrinology evaluation. Levothyroid hormone therapy must be started immediately and TSH (the signal hormone your brain sends to your thyroid) normalized before any pregnancy attempt. TSH should be maintained below 2.5 mIU/L throughout pregnancy.
TSH (the signal hormone your brain sends to your thyroid) very high (>10 mIU/L) — a clearly underactive thyroid; pregnancy contraindicated until treatedUpload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.