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Triiodothyronine (T3) is one of the primary hormones that is produced by the thyroid gland. This test evaluates the thyroid gland functioning. It can also determine the cause behind the disorder and plays a significant role in monitoring the effectiveness of treatment.
Free triiodothyronine is recommended when there is an abnormal TSH or FT4 result. This test can also be used to monitor the treatment. In case there is any sign of hyperthyroidism, doctor will order you to have FT3.
This test measures the amount of free thyroxine in the blood. Thyroxine is a hormone produced by the thyroid gland. Since T4 exists in two forms in our body, so there are two kinds of tests:-
A free T4 test is preferred over the total T4 test. Free T4 test measures the free T4 in the blood.
The doctor will order this test when the TSH test will give abnormal results. A free T4 will allow the doctor to determine what type of problem the patient’s thyroid is in.
There are some disorders that affect thyroid:-
Your doctor may ask you to stop taking some drugs temporarily before the test. So the result will be accurate. In case the patient is pregnant, please tell your doctor. Healthcare provider will take the blood sample and send it to a lab for testing.
The typical results for free T4 in adults range from 0.9 to 2.4 ng/dL. As it may happen with any test result, if it is outside the expected range, talk to your doctor about what the result means.
Factors that can affect the result
An individual’s result may vary and might be affected by:-
TSH stands for Thyroid Stimulating Hormone. This test can also detect any thyroid disorder before someone has any symptoms. If this is not taken seriously, thyroid disorder may cause some serious problems. The pituitary gland produces TSH. This test parameter falls under thyroid function tests.
It is used to detect thyroid diseases such as hyperthyroidism and hypothyroidism.
If your doctor saw you having any of the above symptom, he or she will order this test.
High TSH levels can mean that the thyroid is not making the required amount of thyroid hormone. And low TSH levels can indicate that the thyroid is producing too much thyroid hormone. But this will not describe why thyroid levels are too low or too high. If the test results are abnormal, a doctor may ask the patient to have some additional tests like:-
T3 test and T4 test is used to detect hyperthyroidism. High levels of T3 and T4 indicate the severity of hyperthyroidism.