Thyroid test

Testing from Quest Diagnostics can help you diagnose, treat, monitor, and prevent complications related to every type and etiology of thyroid disease. Quest’s broad range of endocrinology tests are aligned to the most recent clinical practice guidelines—including those from the American Thyroid Association (ATA) and American Association of Clinical Endocrinologists (AACE)—for better disease management. Key thyroid tests from Quest Test Code Test Name Recommended Clinical Use 899 Detects TSH levels for differential diagnosis of primary, secondary, and tertiary hypothyroidism; also useful in screening for hyperthyroidism 867 Used to help diagnose hypothyroidism and hyperthyroidism 861 Used with measurement of thyroxine (T4) to calculate the free T4 index to assess thyroid diseases 866 Used to diagnose hypothyroidism and hyperthyroidism 35167 Used for the differential diagnosis of euthyroid hyperthyroxinemia from hyperthyroidism or for the differential diagnosis of euthyroid hypothyroxinemia from hypothyroidism 7444 A complete panel used to diagnose hypothyroidism and hyperthyroidism 7260 Useful in the diagnosis and management of a variety of thyroid disorders, including autoimmune thyroiditis, Hashimoto’s disease, Graves’ Disease, and certain types of goiter 90810 Used in the detection of residual or recurrent thyroid cancer 30551 Used to detect Graves’ disease; can also assist in predicting hyperthyroidism in neonates 5738 Used to diagnose and manage Graves’ disease, neonat...

• A high TPOAb is also seen after childbirth in • Thyroid-stimulating hormone receptor antibodies (TRAb) are found in 90% of Graves' disease cases, but only 10% of Hashimoto's cases. • Thyroglobulin antibodies (TgAb) are produced by your body in response to the presenceof thyroglobulin. One in four people withthyroid cancer will have elevated TgAb. It's also detected in 80% of people with Hashimoto's and between 50% to 70% of those with Graves'disease. • Thyroid binding globulin (TBG): Measures levels of a protein that carries thyroid hormones in the blood • T3 resin uptake (T3RU): Counts the percentage of TBG in a sample of blood • Free thyroxine index (FTI): An older testing method using total T4 multiplied by the T3RU to check for either low or excessive thyroid function It's important to know that reference ranges and the units of measurement used can vary from lab to lab. To ensure consistency in your test results, try to use the same lab for every test. Interpreting Results Test results have to be interpreted to give them meaning. The one test that arguably gives the most insight into your thyroid function is the TSH. Alongside results of free T3 and free T4 tests, the TSH may even suggest the cause of a thyroid problem. • Normal TSH + normal T4 = normal thyroid function • High TSH + normal T4 = you may have a higher risk of developing an underactive thyroid • Low TSH + high T4 = overactive thyroid • High TSH + low T4 = underactive thyroid • Low TSH + low T4 = low th...