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Also reported in: uIU/mL
Your TSH (the signal hormone your brain sends to your thyroid) is within the normal range, suggesting your thyroid is receiving and responding to appropriate signals from the brain. Thyroid function is likely adequate.
A very low TSH (the signal hormone your brain sends to your thyroid) means your thyroid is producing far too much hormone with almost no braking signal from the brain. Your body is revved too high — heart racing, bones losing density, and your nervous system overstimulated. This can cause dangerous heart arrhythmias.
Seek urgent medical care. Critically suppressed TSH (the signal hormone your brain sends to your thyroid) requires same-day evaluation, especially if you have palpitations, chest pain, or significant tremor.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — very low (ref: {{low}}–{{high}})A low TSH (the signal hormone your brain sends to your thyroid) means your pituitary gland is sending a reduced signal to the thyroid because the thyroid is already too active. Hyperthyroidism may contribute to symptoms including anxiety, heart palpitations, heat intolerance, weight loss, tremor, and sleep problems.
See your doctor for free T3 (the active thyroid hormone your cells actually use), free T4 (the main thyroid hormone in your blood), and TSH (the signal hormone your brain sends to your thyroid) receptor antibody tests. Hyperthyroidism has effective treatments — medication, radioiodine, or surgery depending on the cause.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — below reference range (ref: {{low}}–{{high}})A borderline low TSH (the signal hormone your brain sends to your thyroid) suggests mild thyroid overactivity or 'a mildly overactive thyroid (the early stage).' Symptoms may be subtle — mild anxiety, slight sleep disruption, or a racing heart occasionally. This is especially worth monitoring in older adults due to atrial fibrillation risk.
Have free T3 (the active thyroid hormone your cells actually use) and T4 measured. Discuss with your doctor — some cases are watched, others treated depending on symptoms and risk.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — borderline lowYour TSH (the signal hormone your brain sends to your thyroid) is within the normal range, suggesting your thyroid is receiving and responding to appropriate signals from the brain. Thyroid function is likely adequate.
No action needed. Recheck every 1–2 years if you have risk factors for thyroid disease.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — within reference rangeTSH (the signal hormone your brain sends to your thyroid) between 1.0 and 2.5 mIU/L is considered optimal by many thyroid specialists. At this level, the pituitary is sending a steady, appropriate signal and the thyroid is responding well.
Excellent result. Continue regular thyroid monitoring if you have a personal or family history of thyroid disease.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — optimal (1.0–2.5 mIU/L)A borderline high TSH (the signal hormone your brain sends to your thyroid) means the brain is signalling harder than usual for the thyroid to produce more hormone — often an early sign of hypothyroidism (underactive thyroid). Subtle symptoms include mild fatigue, constipation, and feeling a little cold.
Have free T4 (the main thyroid hormone in your blood) and TPO antibodies (immune proteins that target your thyroid) checked. 'Early or mild hypothyroidism' at this level is sometimes treated, especially in pregnant women or those with symptoms.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — borderline highA high TSH (the signal hormone your brain sends to your thyroid) means your pituitary is shouting loudly for the thyroid to work harder, but the thyroid isn't keeping up. Hypothyroidism may contribute to fatigue, weight gain, cold sensitivity, brain fog, dry skin, constipation, and depression.
See your doctor for free T4 (the main thyroid hormone in your blood) and TPO antibody tests. Hypothyroidism is very treatable with daily thyroid hormone replacement (levothyroxine). Don't delay — untreated hypothyroidism worsens over time.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — above reference range (ref: {{low}}–{{high}})A very high TSH (the signal hormone your brain sends to your thyroid) indicates noticeable hypothyroidism. The thyroid has essentially shut down. In very large cases, this can lead to myxedema coma — a life-threatening medical emergency with profound low body temperature, reduced consciousness, and cardiovascular collapse.
Seek urgent medical care. This level of thyroid failure requires prompt evaluation and treatment with thyroid hormone replacement.
TSH (the signal hormone your brain sends to your thyroid): {{value}} {{unit}} — very high (ref: {{low}}–{{high}})Upload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.