For example, the levels of T3 in your blood might help shed light on the situation. Elevated T4 levels might indicate: hyperthyroidism, such as iodine-induced hyperthyroidism or Graves disease (an autoimmune disease that causes hyperthyroidism) other thyroid problems, such as thyroiditis (inflammation of the thyroid gland) or toxic multinodular goiter (an enlarged thyroid gland with.We're sorry, an error occurred. We are unable to collect your feedback at this time. However, your feedback is important to us. Please try again later. Thank you for your feedback.
Collecting blood for this test will only take a few minutes. What to Expect. Either method (heel or vein withdrawal) of collecting a sample of blood is only temporarily uncomfortable and can feel like a quick pinprick.Afterward, there may be some mild bruising, which should go away in a few days. Getting the Results The blood sample will be processed by a machine. The results are usually available after a few hours or the next day.
Pituitary gland disease. Destruction of the thyroid gland by surgery or radiation.Results of these thyroid hormone tests may be compared to your thyroid-stimulating hormone (TSH) results. Thyroid hormone tests 2 Total thyroxine (T4 micrograms per deciliter (mcg/dL) or 152-292 nanomoles per liter (nmol/L) in newborns mcg/dL (83-172 nmol/L) in babies and older children mcg/dL (57-148 nmol/L) in adults Free thyroxine (FT4 ng/dL nanograms per deciliter (ng/dL).
Your doctor will talk with you about any abnormal results that may be related to your symptoms and past health. High values High thyroid hormone levels ( hyperthyroidism ) may be caused by: Diseases of the thyroid gland, such as.Some of your T4 is called free T4. This means that it has not bonded to protein in your blood. Most of the T4 in your body does bond with protein.
An abnormal result on this test alone may not give your doctor enough information to fully understand or diagnose your condition. Pregnancy can affect your T4 levels. If your T4 levels are abnormal but you are pregnant, your doctor may order further testing.Gcid003517 ptid1 Thyroid Function Tests. (n.d.). American Thyroid Association. Retrieved June 1, 2012, from yroid. org/patients/brochures/FunctionTests_brochure. pdf Thyroxine (T4) Test. (n.d.). Summit Medical Group. Retrieved June 1, 2012, from m/library/adult_health/thyroxine_test/ What do you think of this page?
This means that a value that falls outside the normal values listed here may still be normal for you or your lab. Results are usually available within a few days. Labs generally measure free T4 (FT4) levels, but also may measure total thyroxine (T4) and T3 uptake (T3U).A needle is inserted into a vein (usually in the arm inside of the elbow or on the back of the hand) and blood is withdrawn and collected in a vial or syringe.
There are two kinds of T4 tests. The first, known as a total T4 test, measures both kinds of T4 (the T4 that has bonded to protein and the free T4) in your blood.What Is a T4 Test? Your thyroid produces a hormone, thyroxine, which is known as T4. This hormone plays a role in several of your bodys functions, including growth and metabolism.
The TSH, or thyroid-stimulating hormone, stimulates your thyroid to release both T3 and T4. Performing one or both of these other tests may help your doctor gain a better understanding of your thyroid problem.Reviewed by: Yamini Durani, MD. Date reviewed: July 2014.