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Free tetraiodothyronine (fT4)

Why is the thyroxine level measured?

Along with triiodothyronine, thyroxine is one of two important thyroid hormones. It is also known as free tetraiodothyronine or free T4. The thyroid gland produces around 90 to 95% thyroxine and only a small amount of triiodothyronine.

Thyroxine, like tetraiodothyronine, is determined if there is a suspicion of over- or underactive thyroid gland (hyper- or hypothyroidism).

 

What thyroxine level should men have?

Lower limit: 8 nanograms per liter (ng / l)
Upper limit: 18 nanograms per liter (ng / l)

or.

Lower limit: 10 picomoles per liter (pmol / l)
Upper limit: 23 picomoles per liter (pmol / l)

 

What thyroxine level should women have?

Lower limit: 8 nanograms per liter (ng / l)
Upper limit: 18 nanograms per liter (ng / l)

or.

Lower limit: 10 picomoles per liter (pmol / l)
Upper limit: 23 picomoles per liter (pmol / l)

 

What do low values ​​mean?

The thyroxine values ​​are generally low in severe illnesses. In most cases, however, they indicate an underactive thyroid. The values ​​can also be increased during treatment for an overactive thyroid.

 

What do high values ​​mean?

Thyroxine levels that are too high can indicate an overactive thyroid (hyperthyroidism), thyroid cancer (autonomous adenoma) or Graves' disease.