T4, Total Thyroxine normal range — check your value

Roughly 4.5 to 12 mcg/dL.

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Your T4, Total Thyroxine test value

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T4, Total Thyroxine

µg/dL

What T4, Total Thyroxine measures

All thyroxine in blood, including the large share bound to carrier proteins.

T4, Total Thyroxine normal range chart

ResultT4, Total Thyroxine (µg/dL)

Below rangeBelow 4.87

In range4.87 – 11.2

Above range11.2 and above

These bands are for female, 31–45 years. Enter your age and gender above to see the bands for you. The table below shows the range for every age and gender.

T4, Total Thyroxine normal range by age and gender

AgeMaleFemale

0–1 years6 – 15 µg/dL6 – 15 µg/dL

2–6 years4.87 – 11.2 µg/dL4.87 – 11.2 µg/dL

7–11 years4.87 – 11.2 µg/dL4.87 – 11.2 µg/dL

12–17 years4.87 – 11.2 µg/dL4.87 – 11.2 µg/dL

18–30 years4.87 – 11.2 µg/dL4.87 – 11.2 µg/dL

31–45 years4.87 – 11.2 µg/dL4.87 – 11.2 µg/dL

46–60 years4.87 – 11.2 µg/dL4.87 – 11.2 µg/dL

60 years and above4.87 – 11.2 µg/dL4.87 – 11.2 µg/dL

What a high T4, Total Thyroxine means, and common causes

Total T4 is above range. It includes hormone bound to carrier proteins, so it can read high when proteins are high without any thyroid disease.

Common causes: Overactive thyroid, excess thyroid medication, pregnancy and oestrogen or contraceptive pills, which raise carrier proteins.

What a low T4, Total Thyroxine means, and common causes

Total T4 is below range, usually meaning an underactive thyroid when TSH is raised.

Common causes: Hypothyroidism, severe illness, nephrotic syndrome, and medicines that lower carrier proteins.

Frequently asked questions

Roughly 4.5 to 12 mcg/dL.

Free T4 measures only the active fraction, so it is unaffected by pregnancy or contraceptive pills. Total T4 can mislead in those situations.

Total mein protein se jude hormone bhi ginte hain, Free mein sirf kaam karne wala hormone. Isliye Free T4 zyada bharosemand hai.

Please note. This page explains what a number means against reference ranges for your age and gender. It does not diagnose anything, cannot see the rest of your report, and is no substitute for a doctor. If your lab’s printed range differs, your lab’s range applies.