The free thyroxine test (FT4), often called a free T4 test, measures the quantity of free thyroxine in your blood. T4 circulates within the blood in two forms: free morpheme (FT4) and bound morpheme. Thyroxine (T4) is a hormone secreted by the thyroid and is important for growth and metabolism. The FT4 test helps to diagnose any suspected thyroid disease (hypothyroidism or hyperthyroidism) and check the treatment efficacy in people diagnosed with a thyroid condition.
It is recommended: To diagnose any of the suspected thyroid diseases (hypothyroidism or hyperthyroidism). To check treatment in patients with thyroid diseases. If a patient has symptoms of a thyroid disease like weight loss, a rapid pulse, and sweating related to hyperthyroidism (i.e., when your thyroid produces too many hormones).
The free T4 test measures: Free T4 is often measured as the active form which enters the body tissues where it's needed. Free thyroxine (FT4) constitutes only 0.3% of the entire T3 hormone. Hence, the T4 hormone is often measured as free T4 or total T4. Total T4 includes both the bound and, therefore, the free forms circulating within the bloodstream and may be suffering from the quantity of protein available within the blood to bind to them. Therefore, the thyroxine (T4) free test may be a useful indicator of the T4 levels within the blood when binding proteins are increased or decreased. Thyroid hormones are essential for growth and metabolism. If the thyroid produces very high amounts of T3 and T4 hormones, you'll experience symptoms like weight loss, rapid heartbeat, tremors, sweating, anxiety, increased sensitivity to heat, etc., This is known as hyperthyroidism. This test is employed to measure the amount of free thyroxine (FT4) within the blood. The thyroid produces hormones referred to as triiodothyronine (T3) and thyroxine (T4). These hormones help to regulate the speed at which energy is employed in almost every tissue within the body.
You will get the reports within 6 hours after the collection of the blood sample.
The free T4 test is prescribed by your doctor after a complete assessment of your symptoms and conditions.
0.78–2.19 ng/dl.
We require a blood sample for this test.
The test can be taken at any time during the day.
No, fasting is not required for the T4 test.
There are no specific precautions for this test.
Copyright © 2024 Medtotes Pvt Ltd, All Right Reserved.
