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Also reported in: nmol/L
Your total T3 is within the reference range, suggesting adequate active thyroid hormone in circulation.
Very low total T3 is seen in noticeable hypothyroidism, serious systemic illness (low T3 syndrome in ICU patients), or profound malnutrition. Active thyroid hormone is nearly absent at the cellular level.
Seek urgent medical evaluation. The underlying cause needs urgent identification and treatment.
Total T3: {{value}} {{unit}} — very low (ref: {{low}}–{{high}})Low total T3 can indicate hypothyroidism or poor T4-to-T3 conversion. Chronic illness, calorie restriction, and selenium deficiency are common causes of impaired T3 production even when T4 looks normal.
Evaluate alongside 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). Selenium intake and chronic illness status should be assessed.
Total T3: {{value}} {{unit}} — below reference range (ref: {{low}}–{{high}})Borderline low total T3 can occur with mild hypothyroidism, suboptimal T4-to-T3 conversion, or simply low binding protein levels. Symptoms may be subtle.
Check free T3 (the active thyroid hormone your cells actually use) and selenium levels. Discuss with your doctor if you have symptoms of hypothyroidism despite normal TSH (the signal hormone your brain sends to your thyroid).
Total T3: {{value}} {{unit}} — borderline lowYour total T3 is within the reference range, suggesting adequate active thyroid hormone in circulation.
No action needed. Evaluate alongside TSH (the signal hormone your brain sends to your thyroid) and free T4 (the main thyroid hormone in your blood) for a complete picture.
Total T3: {{value}} {{unit}} — within reference rangeYour total T3 is in the healthy midrange, indicating good T4-to-T3 conversion and adequate active hormone availability.
No action needed. Excellent result.
Total T3: {{value}} {{unit}} — optimalBorderline high total T3 can indicate early or mild hyperthyroidism, or may reflect elevated binding proteins. Check free T3 (the active thyroid hormone your cells actually use) and TSH (the signal hormone your brain sends to your thyroid) for clarity.
Have TSH (the signal hormone your brain sends to your thyroid) and free T3 (the active thyroid hormone your cells actually use) checked. If symptomatic, see your doctor.
Total T3: {{value}} {{unit}} — borderline highElevated total T3 can indicate hyperthyroidism or a specific condition called T3-toxicosis (where T3 is disproportionately elevated over T4). This may contribute to the classic symptoms of an overactive thyroid.
See your doctor. Free T3, TSH (the signal hormone your brain sends to your thyroid), and thyroid antibodies should be checked to determine the cause.
Total T3: {{value}} {{unit}} — above reference range (ref: {{low}}–{{high}})A very high total T3 in a symptomatic patient is consistent with thyroid storm or noticeable T3-toxicosis — both medical emergencies.
Seek emergency medical care if symptomatic. Urgent anti-thyroid treatment is needed.
Total T3: {{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.