Test Detail
Understanding the Test
Test Measures
Other Tests
Content created by
Written by
Dr. Betina Chandolia
BDS, MDS - Oral Pathology and Microbiology
Reviewed by
Dr. Ashish Ranjan
MBBS, MD (Pharmacology)
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Thyroid Function Test

Thyroid Function Test Includes 3 testsView All
You need to provide
Blood
This test is for
Male, Female
Test Preparation
  1. Do not eat or drink anything other than water for 8-12 hours before the test

Understanding Thyroid Function Test


What is Thyroid Function Test?

Thyroid function tests are blood tests that help to check the function of your thyroid gland. They are mainly used to detect an underactive thyroid gland (hypothyroidism) and an overactive thyroid gland (hyperthyroidism).

 

This test is prescribed by the doctor to diagnose any suspected thyroid disease (Hypothyroidism or Hyperthyroidism) and to monitor the patient’s response to thyroid diseases treatment.

What is Thyroid Function Test used for?

  1. To help evaluate thyroid gland function
  2. To help diagnose thyroid disorders
  3. To monitor the response to treatment
  4. As a routine health checkup or when symptoms suggest hypo- or hyperthyroidism due to a condition affecting the thyroid

What does Thyroid Function Test measure?

Contains 3 tests
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Triiodothyronine Total

A Triiodothyronine Total measures triiodothyronine, also known as T3, hormone that is produced by the thyroid gland. T3 hormone plays an important role in regulating the body's metabolism, energy levels, and growth & development. It exists in the blood in two forms: free T3 and bound T3. Free T3 is not bound to proteins in the blood and is the active form of T3. Whereas, bound T3 is bound to proteins, such as albumin and thyroid hormone binding globulin (THBG), which prevent it from entering the body tissues.

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TSH (Thyroid Stimulating Hormone) Ultrasensitive

A TSH (Thyroid Stimulating Hormone) Ultrasensitive test measures the levels of TSH hormone in the blood. TSH is produced by the pituitary gland located in the brain. Its function is to stimulate and regulate the functioning of the thyroid gland. It signals the thyroid gland to increase or decrease the production of thyroid hormones T3 and T4 (essential for regulating our body’s metabolism, temperature, heart rate, and growth) when their levels are low or high, respectively. Therefore, when the levels of T3 & T4 decrease, the pituitary gland is stimulated to release TSH. This high TSH level, in turn, stimulates the thyroid gland to release more thyroid hormones (T3 & T4); the vice-versa happens when the levels of thyroid hormones increase.

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Thyroxine - Total

A Thyroxine - Total measures both the bound and unbound/free form of thyroxine (T4) hormone in the blood. T4 exists in the blood in two forms: bound (attached to proteins) and free (not attached to proteins). Most of the T4 circulating in the blood is bound to proteins and only a small part is free. It is necessary to maintain a fine balance of these forms to ensure the proper functioning of the body.

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