FT4 and FT3 are also two of the most important tests. Knowingly, T3 only represents just 5% of normal thyroid hormone. Measurement of free triiodothyronine is the prime reason why this test is run. Decreasing amount of FT4 may cause hypothyroidism, which may cause several types of disorders. FT4 is known for comprising a little fraction of total thyroxine that remains available to the body tissues. Free T3 and T4 blood tests are included in all kinds of FT4 tests. You must inform your doctor before the test if you are already on medication or having any kind of allergies. No other specific preparations are needed for these tests. However, 10-12 hours of complete fasting is necessary before appearing for the test. The test results may vary depending upon gender and age or the health condition of the patient.
Sample Type: Blood
10-12 hours fasting is required. Water is allowed.
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What is the free thyroxine test?
As there are two types of thyroxine test, one is the free thyroxine test and other one is total thyroxine test. The most preferred test is the free thyroxine (FT4) test. This test helps to measure the free thyroxine hormone in the blood and gives the accurate result.
When to get tested?
When your doctor suspects that you may have hypothyroidism or hyperthyroidism, and if they want to analyse the function of your thyroid gland, in both cases you can be recommended to take this test.
Sample requirements
A blood sample will be drawn from the vein of your hand. A free thyroxine (FT4) test cost is affordable.
Test preparation
No fasting is needed to perform this test. Do consult with your doctor about your medications. The free thyroxine (FT4) test price is not very high.
Result interpretation
An increased free T4 level indicates that you may have hyperthyroidism, thyroiditis, or goitre. Besides, a decreased free T4 level indicates that you may have hypothyroidism, pituitary issues or iodine deficiency. However, some factors such as pregnancy, thyroid medicines, too much iodine and protein can affect the free T4 level. You can book a free thyroxine (FT4) test online to get your test done.
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