Test FAQ T4, Free. To view specimen requirements and codes please. Select a regional laboratory. Not sure which laboratory serves your office? Call us 866-MYQUEST 35167 X 35167 T4 Free, Direct Dialysis 35167.
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.
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.
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.
Article Resources Article resources Blood Test: T4 (Thyroxine). (2011, April). KidsHealth. org. Retrieved June 1, 2012, from ml T4. (2012, April 18). Lab Tests Online. Retrieved June 1, 2012, from http labtestsonline.
The free thyroxine (T4) direct serum test from Walk-In Lab helps to evaluate thyroid gland function. The free thyroxine test is a blood test and does not require fasting. Results are typically available within one to two days.
The second, a free T4 test, measures only the free T4 in your blood. Why Doctors Perform a T4 Test. Your doctor will often order a T4 if a thyroid-stimulating hormone (TSH) test has come back with abnormal results and your doctor wants further insight into what could be wrong with your thyroid.
More commonly, you may experience pain or discomfort during the blood draw. You might also bleed slightly after the needle is removed, and you might develop a small bruise around the puncture site.
My Recent Searches No Recent Search. My Tests Viewed No Test Viewed. Test Name. CPT Code(s) 84439 Methodology Direct Equilibrium Dialysis Immunoassay Reference Range(s) Prematures, 25-30 Weeks Birth-7 Days ng/dL Prematures, 31-36 Weeks Birth-7 Days ng/dL.
Cord Blood, 37 Weeks ng/dL Birth-4 Days ng/dL 2 Weeks-2 Years ng/dL 3-20 Years ng/dL 21-87 Years ng/dL Pregnancy First Trimester ng/dL Second Trimester ng/dL. Third Trimester ng/dL Clinical Significance Free T4 by equilibrium dialysis is the most accurate measure of Free T4.
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?
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.
Results are independent of the concentration of the T4-binding proteins, the presence of molecular variants of these proteins, or circulating autoantibodies. Free T4 is useful in distinguishing euthyroidism from thyroid disease.
The free T4 test is generally ordered to help evaluate a person with a goiter (enlarged thyroid gland) and to aid in the diagnosis of female infertility. The test results of a free T4 test are not diagnostic but help to guide a doctor in performing additional testing to find the root cause of the.
Both are used to help diagnose hyperthyroidism and hypothyroidism. The total T4 test results are affected by the amount of proteins available in the blood to bind the hormone whereas the free T4 test results are not affected by the amount of proteins in the blood.