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Also reported in: nmol/L
Your total T4 is within the reference range. Note that this test measures both bound and free T4 (the main thyroid hormone in your blood) — free T4 is a more specific indicator of active thyroid hormone.
Very low total T4 indicates profound hypothyroidism. The thyroid gland has nearly stopped producing hormone. This needs urgent medical attention, especially in newborns (cretinism) and elderly patients (myxedema coma risk).
Seek urgent medical care. Thyroid hormone replacement is urgently needed.
Total T4: {{value}} {{unit}} — very low (ref: {{low}}–{{high}})Low total T4 is consistent with reduced thyroid hormone production. Note that binding protein abnormalities can affect total T4 without actually changing available free T4 (the main thyroid hormone in your blood), so free T4 provides more reliable information about true thyroid status.
Your doctor should interpret this alongside free T4 (the main thyroid hormone in your blood) and TSH (the signal hormone your brain sends to your thyroid) for a complete picture. Treatment depends on whether free T4 is also low.
Total T4: {{value}} {{unit}} — below reference range (ref: {{low}}–{{high}})Borderline low total T4 is often due to low protein levels (which carry T4 in the blood) rather than true thyroid disease. Free T4 is a more reliable indicator of actual thyroid hormone availability.
Have free T4 (the main thyroid hormone in your blood) and TSH (the signal hormone your brain sends to your thyroid) checked for a more accurate assessment.
Total T4: {{value}} {{unit}} — borderline lowYour total T4 is within the reference range. Note that this test measures both bound and free T4 (the main thyroid hormone in your blood) — free T4 is a more specific indicator of active thyroid hormone.
No action needed when TSH (the signal hormone your brain sends to your thyroid) and free T4 (the main thyroid hormone in your blood) are also normal.
Total T4: {{value}} {{unit}} — within reference rangeYour total thyroid hormone sits in the healthy midrange, supporting normal thyroid function alongside normal TSH (the signal hormone your brain sends to your thyroid) and free T4 (the main thyroid hormone in your blood) levels.
No action needed.
Total T4: {{value}} {{unit}} — optimalBorderline high total T4 can result from elevated binding proteins (common in pregnancy or with oral contraceptives) or mild hyperthyroidism. Free T4 provides clearer interpretation.
Check free T4 (the main thyroid hormone in your blood) and TSH (the signal hormone your brain sends to your thyroid) to clarify whether this reflects true hyperthyroidism or protein binding changes.
Total T4: {{value}} {{unit}} — borderline highHigh total T4 may indicate hyperthyroidism, or may be due to elevated thyroid binding globulin (TBG) from pregnancy, oral contraceptives, or certain medications. Free T4 clarifies the picture.
Your doctor should check free T4 (the main thyroid hormone in your blood), TSH (the signal hormone your brain sends to your thyroid), and TBG to determine whether this is true hyperthyroidism.
Total T4: {{value}} {{unit}} — above reference range (ref: {{low}}–{{high}})Very high total T4 in the context of symptoms indicates noticeable hyperthyroidism or thyroid storm. This needs urgent medical attention.
Seek emergency care immediately if symptomatic (palpitations, fever, confusion). This requires urgent medical management.
Total 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.