What is this test?
This is a test used to evaluate the proper functioning of the thyroid gland and monitor thyroid treatment.
 
Sample required
Blood.
 
Patient preparation
Acute illness may affect thyroid testing test results. It is generally recommended that thyroid testing be avoided in hospitalized patients Inform the doctor if you are on any medications, or have any allergies or underlying medical conditions before this test.
 
Turn-around time (How long does it take?)
5 Hours.
 
Basis of the Test
Triiodothyronine (T3) is one of two major hormones produced by the thyroid gland, the other major thyroid hormone is called thyroxine (T4) and together they help control the rate at which the body uses energy. If the thyroid gland produces excessive amounts of T4 and T3, then the person affected may have symptoms associated with overactive thyroid (hyperthyroidism), such as nervousness, tremors of the hands, weight loss, insomnia, and puffiness around dry, irritated eyes and in some cases, bulging eyes. Insufficient amounts of T4 and T3, then the person may have signs and symptoms associated with underactive thyroid (hypothyroidism) and a slowed metabolism, such as weight gain, dry skin, fatigue, and constipation around dry, irritated eyes and in some cases, bulging eyes.