Initializing Vogelview...
Performing medical cross-referencing...
Initializing Vogelview...
Performing medical cross-referencing...
Loading...
Also reported in: pmol/L
Your free T3 (the active thyroid hormone your cells actually use) is within the normal range, indicating adequate delivery of active thyroid hormone to your cells.
Free T3 is the most metabolically active thyroid hormone — it's what your cells actually use. Very low T3 means your body is profoundly hypothyroid at the cellular level, even if other markers look borderline.
Seek urgent medical care. This level of T3 deficiency affects every organ system and requires prompt thyroid hormone evaluation and treatment.
Free T3: {{value}} {{unit}} — very low (ref: {{low}}–{{high}})Low free T3 (the active thyroid hormone your cells actually use) means your cells aren't receiving adequate active thyroid hormone, even if free T4 (the main thyroid hormone in your blood) and TSH (the signal hormone your brain sends to your thyroid) appear normal. This is known as 'low T3 syndrome' or 'poor T4-to-T3 conversion' and can cause all the classic hypothyroid symptoms despite seemingly normal standard tests.
Discuss with a thyroid-aware doctor. Some patients benefit from T3 supplementation (liothyronine) or combined T4/T3 therapy. Selenium supports T4-to-T3 conversion.
Free T3: {{value}} {{unit}} — below reference range (ref: {{low}}–{{high}})A borderline low free T3 (the active thyroid hormone your cells actually use) can cause subtle hypothyroid-like symptoms — fatigue, mild brain fog, cold hands — even when TSH (the signal hormone your brain sends to your thyroid) is normal. Poor T4-to-T3 conversion, chronic illness, or nutritional deficiencies (selenium, iodine, zinc) can contribute.
Discuss with your doctor. Selenium supplementation (200 mcg/day) may improve T4-to-T3 conversion. Address any nutritional deficiencies.
Free T3: {{value}} {{unit}} — borderline lowYour free T3 (the active thyroid hormone your cells actually use) is within the normal range, indicating adequate delivery of active thyroid hormone to your cells.
No action needed.
Free T3: {{value}} {{unit}} — within reference rangeYour free T3 (the active thyroid hormone your cells actually use) sits in the upper-middle of the healthy range, suggesting excellent T4-to-T3 conversion and active thyroid hormone availability for your cells.
Excellent result. No action needed.
Free T3: {{value}} {{unit}} — optimalA borderline high free T3 (the active thyroid hormone your cells actually use) can cause mild hyperthyroid symptoms — slight anxiety, occasional palpitations, or mild heat intolerance. This should be evaluated alongside TSH (the signal hormone your brain sends to your thyroid) and free T4 (the main thyroid hormone in your blood).
Have your TSH (the signal hormone your brain sends to your thyroid) and free T4 (the main thyroid hormone in your blood) checked. If on thyroid medication, dose review may be needed.
Free T3: {{value}} {{unit}} — borderline highElevated free T3 (the active thyroid hormone your cells actually use) is a strong marker of hyperthyroidism. At this level, virtually every organ system is overstimulated — the heart runs fast, bones lose density, weight drops, and anxiety and sleep disruption are common.
See your doctor urgently. Further evaluation and treatment of hyperthyroidism are needed to prevent serious cardiac and bone complications.
Free T3: {{value}} {{unit}} — above reference range (ref: {{low}}–{{high}})Very high free T3 (the active thyroid hormone your cells actually use) is a medical emergency — it may indicate an imminent or active thyroid storm, with risk of very fast heart rate, hyperthermia, and life-threatening cardiovascular collapse.
Seek emergency medical care immediately. Thyroid storm can be serious and requires urgent hospital management.
Free 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.