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20 Jul

T3 Test

Brief Summary:

The thyroid gland is located in the neck, just below Adam’s apple. The thyroid creates hormones and controls how your body uses energy and your body’s sensitivity to other hormones. 

The thyroid produces a hormone called triiodothyronine, known as T3. It also produces a hormone called thyroxine, known as T4. Together, these hormones regulate your body’s temperature, metabolism, and heart rate.

Most of the T3 in your body binds to protein. The T3 that doesn’t bind to protein is called free T3 and circulates unbound in your blood. The most common kind of T3 test, known as the T3 total test, measures both kinds of T3 in your blood.

By measuring the T3 in your blood, your doctor may be able to determine if you have a thyroid problem.

 

Technical Purpose:

The thyroid gland is located in the neck, just below Adam’s apple. The thyroid creates hormones and controls how your body uses energy and your body’s sensitivity to other hormones. 

The thyroid produces a hormone called triiodothyronine, known as T3. It also produces a hormone called thyroxine, known as T4. Together, these hormones regulate your body’s temperature, metabolism, and heart rate.

Most of the T3 in your body binds to protein. The T3 that doesn’t bind to protein is called free T3 and circulates unbound in your blood. The most common kind of T3 test, known as the T3 total test, measures both kinds of T3 in your blood.

By measuring the T3 in your blood, your doctor may be able to determine if you have a thyroid problem.

Your doctor will typically order a T3 test if they suspect a problem with your thyroid.

thyroid disorder can cause a wide range of symptoms. For example, you might have mental issues such as anxiety, or physical problems such as constipation and menstrual irregularity.

If you already have confirmation of a thyroid problem, your doctor might use a T3 test to see whether there have been any changes in your condition.

 

Test Process:

The T3 test simply involves having your blood drawn. The blood will then be tested in a laboratory.

Typically, normal results range from 100 to 200 nanograms per deciliter (ng/dL).

 

Test Outcomes:

High T3 levels

If you’re not pregnant or suffering from liver disease, elevated T3 levels might indicate thyroid issues, such as:

  1. Graves’ disease
  2. Hyperthyroidism
  3. Painless (silent) thyroiditis
  4. Thyrotoxic periodic paralysis
  5. Toxic nodular goiter

 

High T3 levels might also indicate high levels of protein in the blood. In rare cases, these elevated levels could indicate thyroid cancer or thyrotoxicosis.

 

Low T3 levels

Abnormally low levels of T3 may indicate hypothyroidism or starvation. It could also indicate that you have a long-term illness since T3 levels decrease when you’re sick. If you’re sick enough to be hospitalized, your T3 levels are likely to be low. This is one reason that doctors do not routinely use the T3 test as a thyroid test. Instead, they often use it along with the T4 and TSH test to get a more complete picture of how your thyroid is working.

 

Sources:

https://www.healthline.com/health/t3#abnormal-results

Qube Health
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