Triiodothyronine (T3) is one of the thyroid hormones, which are essential for maintaining and regulating body’s metabolism.3
What is T3 Reverse?3
Reverse T3 (rT3) is an inactive form of T3 that is produced in the body specially during stress. rT3 test is a blood test which is used to determine if the person has ‘nonthyroidal illness syndrome’ or ‘sick euthyroid syndrome’.
Why is T3 Reverse suggested?4
Production of rT3 is generally triggered during periods of stress. This test is usually suggested for a person experiencing symptoms of hypothyroidism.
Increased production may also be due to:
- Extreme dieting.
- Exposure to certain chemicals.
- Liver/kidney disease.
- Insulin dependent diabetes.
- Serious injury.
- Chronic alcohol ingestion.
- Abnormally low levels of certain nutrients.
How is T3 Reverse performed?5
The nurse/lab technician rinses the skin on your arm with an alcohol pad, inserts a needle into a vein on the rinsed skin, draws the blood and stores it in a small vial. You may feel a slight pinch. The nurse will place a dressing strip on the skin immediately after the process.
The blood sample is sent to the laboratory for diagnosis.
What are the parameters measured in T3 Reverse?13
The test is used to determine if the person has ‘nonthyroidal illness syndrome’ or ‘sick euthyroid syndrome’ as opposed to hypothyroidism.
Increased level of rT3 may indicate:
- Increased cortisol and other stressors.
- Increased adrenalin.
- Wilson’s Thyroid Syndrome.
- Chronic Fatigue Syndrome.
- Decreased levels of Selenium.
Preparation before performing T3 Reverse 13
There is no prior preparation or fasting required before the test.
Post-care after T3 Reverse 5
Do not remove the dressing strip before 30 mins-1 hour. Avoid any strenuous activity throughout the day. If bleeding occurs, apply pressure with your fingers at the needle site. Avoid wearing tight clothes on your arms.
Sample types in T3 Reverse 1
Side effects/risks of T3 Reverse 5
Side effects of the blood test might include:
- Slight bruising or throbbing on the needle site.