Free T3

243.00

This test is done to check your thyroid function. Thyroid function depends on the action of T3 and other hormones, including thyroid-stimulating hormone (TSH) and T4.

Sometimes it can be useful to measure both T3 and T4 when evaluating thyroid function.

The total T3 test measures the T3 that is both attached to proteins and floating free in the blood.

The free T3 test measures the T3 that is floating free in the blood. The tests for free T3 are generally less accurate than for total T3.

Your provider may recommend this test if you have signs of a thyroid disorder, including:

The pituitary gland does not produce normal amounts of some or all of its hormone (hypopituitarism)
Overactive thyroid gland (hyperthyroidism)
Underactive thyroid gland (hypothyroidism)
Taking medicines for hypothyroidism

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