Initializing Vogelview...
Performing medical cross-referencing...
Initializing Vogelview...
Performing medical cross-referencing...
Loading...
Also reported in: pmol/L
Your free T4 (the main thyroid hormone in your blood) level is normal, indicating your thyroid is producing adequate hormone for normal metabolic function.
Free T4 is the storage form of thyroid hormone circulating in your blood. A very low level means your thyroid is barely producing hormone, and your entire metabolism is shutting down. Without treatment, this can become very serious.
Seek urgent medical care. Thyroid hormone replacement therapy is urgently needed.
Free T4: {{value}} {{unit}} — very low (ref: {{low}}–{{high}})A low free T4 (the main thyroid hormone in your blood) is consistent with hypothyroidism — your thyroid is not producing enough hormone to maintain normal metabolism. Every body system slows down: heart rate, digestion, thinking speed, and energy production.
See your doctor to start thyroid hormone replacement (levothyroxine). This is a highly effective, once-daily treatment that restores normal thyroid function.
Free T4: {{value}} {{unit}} — below reference range (ref: {{low}}–{{high}})A borderline low free T4 (the main thyroid hormone in your blood) suggests mild thyroid underproduction. Some people are symptomatic (fatigue, brain fog, weight gain) at this level, while others feel fine.
Discuss with your doctor whether treatment or monitoring is appropriate, taking symptoms into account alongside TSH (the signal hormone your brain sends to your thyroid) levels.
Free T4: {{value}} {{unit}} — borderline lowYour free T4 (the main thyroid hormone in your blood) level is normal, indicating your thyroid is producing adequate hormone for normal metabolic function.
No action needed. Recheck annually if you have thyroid disease risk factors.
Free T4: {{value}} {{unit}} — within reference rangeYour free T4 (the main thyroid hormone in your blood) is in the middle of the healthy range, providing your tissues with a steady, optimal supply of thyroid hormone.
Excellent result. No action needed.
Free T4: {{value}} {{unit}} — optimalA borderline high free T4 (the main thyroid hormone in your blood) suggests mild thyroid overactivity. Symptoms may include mild anxiety, subtle palpitations, or slight weight loss.
Have TSH (the signal hormone your brain sends to your thyroid) and free T3 (the active thyroid hormone your cells actually use) checked alongside this. If on thyroid medication, the dose may need adjustment.
Free T4: {{value}} {{unit}} — borderline highElevated free T4 (the main thyroid hormone in your blood) is consistent with hyperthyroidism — too much thyroid hormone is revving your metabolism. This may contribute to anxiety, heart palpitations, weight loss, heat intolerance, and sleep disruption.
See your doctor for TSH (the signal hormone your brain sends to your thyroid) receptor antibody and imaging tests. Treatment options (anti-thyroid medications, radioiodine, surgery) are effective and depend on the cause.
Free T4: {{value}} {{unit}} — above reference range (ref: {{low}}–{{high}})Very high free T4 (the main thyroid hormone in your blood) can signal a thyroid storm — a life-threatening emergency where the body is overwhelmed by excess thyroid hormone, causing very rapid heart rate, high fever, and altered consciousness.
Seek emergency medical care immediately. This is a potential thyroid storm that requires urgent hospital treatment.
Free T4: {{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.