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T3RU Test – Thyroid Hormone-Binding Ratio

Resin T3 uptake; T3 resin uptake; Thyroid hormone-binding ratio

The T3RU test measures the level of proteins that carry thyroid hormones in the blood. This can help your health care provider interpret the results of T3 and T4 blood tests.

Because tests called the free T4 blood test and TBG blood tests are now available, the T3RU test is rarely used these days.

How the Test is Performed

A blood sample is needed.

How to Prepare for the Test

Your provider will tell you if you need to stop taking any medicines before the test that may affect your test result. DO NOT stop taking any medicine without first talking to your provider.

Some drugs that can increase T3RU levels include:

  • Anabolic steroids
  • Heparin
  • Phenytoin
  • Salicylates (high dose)
  • Warfarin

Some drugs that can decrease T3RU levels include:

  • Antithyroid medicines
  • Birth control pills
  • Clofibrate
  • Estrogen
  • Thiazides

Pregnancy can also decrease T3RU levels.

These things can increase thyroxin binding globulin (TBG) levels (see below section “Why the Test is Performed” for more about TBG):

  • Male hormones (androgens)
  • Serious illness
  • Kidney disease

Other medicines that bind to protein in the blood can also affect test results

How the Test will Feel

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a slight bruise. This soon goes away.

Why the Test is Performed

This test is done to check your thyroid function. Thyroid function depends on the action of many different hormones, including thyroid-stimulating hormone (TSH), T3, and T4.

This test helps see how much thyroxin binding globulin (TBG) is available. TBG is a protein that carries most of the T3 and T4 in the blood.

Your provider may recommend a T3RU test if you have signs of a thyroid disorder, including:

  • Hyperthyroidism (overactive thyroid)
  • Hypothyroidism (underactive thyroid)
  • Thyrotoxic periodic paralysis (muscle weakness caused by high levels of thyroid hormone in the blood)

Normal Results

Normal values range from 24% to 37%.

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your provider about the meaning of your specific test results.

What Abnormal Results Mean

Higher-than-normal levels may indicate:

  • Kidney failure
  • Overactive thyroid (hyperthyroidism)
  • Nephrotic syndrome
  • Protein malnutrition
  • Acute hepatitis (liver disease)
  • Pregnancy
  • Hypothyroidism
  • Use of estrogen

Abnormal results may also be due to an inherited condition of high TBG levels. Usually, thyroid function is normal in people with this condition.

This test may also be done for:

  • Chronic thyroiditis (swelling or inflammation of the thyroid gland, including Hashimoto’s disease)
  • Drug-induced hypothyroidism
  • Graves disease
  • Subacute thyroiditis
  • Thyrotoxic periodic paralysis
  • Toxic nodular goiter

Risks

Veins and arteries vary in size from one person to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight but may include:

  • Excessive bleeding
  • Fainting or feeling lightheaded
  • Hematoma (blood buildup under the skin)
  • Infection (a slight risk any time the skin is broken)

FAQ

What is the T3RU test?

  • The T3RU test measures the level of proteins that carry thyroid hormones in the blood. This can help your health care provider interpret the results of T3 and T4 blood tests.

What is the normal value of T3RU?

Dr. Harun Ar Rashid
Show full profile Dr. Harun Ar Rashid

Dr. MD Harun Ar Rashid, FCPS, MD, PhD, is a highly respected medical specialist celebrated for his exceptional clinical expertise and unwavering commitment to patient care. With advanced qualifications including FCPS, MD, and PhD, he integrates cutting-edge research with a compassionate approach to medicine, ensuring that every patient receives personalized and effective treatment. His extensive training and hands-on experience enable him to diagnose complex conditions accurately and develop innovative treatment strategies tailored to individual needs. In addition to his clinical practice, Dr. Harun Ar Rashid is dedicated to medical education and community outreach, often participating in initiatives that promote health awareness and advance medical knowledge. His career is a testament to the high standards represented by his credentials, and he continues to contribute significantly to his field, driving improvements in both patient outcomes and healthcare practices.

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