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Also reported in: pmol/L
Your reverse T3 level is within normal limits. Reverse T3 is an inactive form of thyroid hormone that competes with active T3 at cell receptors. Normal levels mean this competition is not excessive.
Very low reverse T3 is rare and of uncertain clinical significance. It may reflect very high active T3 relative to reverse T3 production.
Discuss with your doctor in context of all thyroid markers. Not typically clinically significant in isolation.
Reverse T3: {{value}} {{unit}} — very low (ref: {{low}}–{{high}})Low reverse T3 means your body is converting more T4 into active T3 rather than the inactive reverse T3. This is generally considered favorable for metabolic health.
Generally a good sign. No action needed.
Reverse T3: {{value}} {{unit}} — below reference range (ref: {{low}}–{{high}})Low-normal reverse T3 indicates a healthy T4-to-active-T3 conversion pathway. This is generally favorable.
No action needed.
Reverse T3: {{value}} {{unit}} — borderline lowYour reverse T3 level is within normal limits. Reverse T3 is an inactive form of thyroid hormone that competes with active T3 at cell receptors. Normal levels mean this competition is not excessive.
No action needed. Evaluate alongside free T3 (the active thyroid hormone your cells actually use) ratio for a complete picture.
Reverse T3: {{value}} {{unit}} — within reference rangeYour reverse T3 is in the lower-optimal range, meaning minimal inactive thyroid hormone is blocking your cell receptors. Your active T3 can work effectively.
Good result. No action needed.
Reverse T3: {{value}} {{unit}} — optimalBorderline high reverse T3 can occur with stress, illness, calorie restriction, or high cortisol — the body shifts T4 conversion away from active T3 and toward the inactive reverse form as a protective mechanism during stress.
Evaluate in context of your lifestyle — chronic stress, poor sleep, low-calorie diets, and illness all raise reverse T3. Addressing these may help normalize levels.
Reverse T3: {{value}} {{unit}} — borderline highHigh reverse T3 can block thyroid hormone receptors, causing hypothyroid-like symptoms even when T4 and TSH (the signal hormone your brain sends to your thyroid) look normal. Chronic stress, high cortisol, inflammation, calorie restriction, and heavy metal toxicity are common may contribute to. This is sometimes called 'thyroid resistance' or 'reverse T3 dominance.'
Discuss with a thyroid-aware doctor. Addressing the root cause (stress, inflammation, diet) is the primary approach. Some patients with noticeable symptoms benefit from T3-only or T4/T3 combination therapy.
Reverse T3: {{value}} {{unit}} — above reference range (ref: {{low}}–{{high}})A very high reverse T3 indicates profound impairment of thyroid hormone action at the cellular level — likely from very large physiological stress, noticeable illness, or advanced chronic disease. Active T3 cannot function effectively.
Seek medical evaluation urgently. The underlying cause — whether noticeable illness, very large stress, or metabolic disease — needs to be addressed. Specialist thyroid consultation may be warranted.
Reverse 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.