What does T3RU mean?
A T3 resin uptake (also called a T3 uptake or T3RU) is a blood test performed as part of an evaluation of thyroid function. The thyroid is a gland in the neck that produces the hormones that help regulate many body processes, including growth, energy balance, body temperature, and heart rate.
What is T3RU in a blood test?
The T3RU test measures the level of proteins that carry thyroid hormone in the blood. This can help your health care provider interpret the results of T3 and T4 blood tests.
What does high T uptake mean?
A high T3 uptake means binding proteins are more saturated than normal. When combined with a total T4, this test allows the “free thyroid index” to be calculated, thus correcting for low or high thyroid binding proteins.
What happens when thyroid T3 is high?
As its name suggests, hyperthyroidism occurs when your body makes too much of the thyroid hormones, thyroxine (T4) and triiodothyronine (T3), and becomes overactive. If you have hyperthyroidism, you may experience a fast heartbeat, increased appetite, anxiety, sensitivity to heat, or sudden weight loss.
How long does a radioactive iodine scan take?
The scan takes about 30 minutes. Why the test is performed: This test is performed to evaluate thyroid function, particularly when blood tests of thyroid function (for example, T3 or T4 levels) have abnormal results.
What is a critical TSH level?
The standard reference range for the TSH level is anywhere between 0.30 and 5.0 uIU/mL. If your TSH level is higher than 5.0 uIU/mL, then the lab will flag you as “high,” and you may experience the symptoms listed above 5.0 uIU/mL. Values of the TSH level more than 10.0 uIU/mL need long-term thyroid supplements.
What if my T3 and T4 are normal but TSH is high?
Normally, low levels (less than 5 units) of TSH are sufficient to keep the normal thyroid gland functioning properly. When the thyroid gland becomes inefficient such as in early hypothyroidism, the TSH becomes elevated even though the T4 and T3 may still be within the “normal” range.
What is t3ru test for thyroid?
T3RU test. The T3RU test measures the level of proteins that carry thyroid hormone in the blood. This can help your health care provider interpret the results of T3 and T4 blood tests.
What is a thyroid goiter?
Your thyroid is a butterfly-shaped gland located at the base of your neck just below your Adam’s apple. Although goiters are usually painless, a large goiter can cause a cough and make it difficult for you to swallow or breathe. The most common cause of goiters worldwide is a lack of iodine in the diet.
What can affect t3ru and TBG levels?
Pregnancy can also decrease T3RU levels. These conditions can decrease TBG levels (see below section “Why the Test is Performed” for more about TBG): Other medicines that bind to protein in the blood can also affect test results. When the needle is inserted to draw blood, some people feel moderate pain.
What is the T3 resin uptake (t3ru)?
He is Verywell’s Senior Medical Advisor. The T3 resin uptake (T3RU) test is a test of thyroid-related proteins in the blood. It’s used to help doctors interpret the results of other thyroid tests, namely the T3 and T4 tests, which show how much thyroid hormone is available to the body in free form.