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Thyroid Function Test

Table of Contents


  • Price: VND 300,000
  • Exam frequency: 6 months/ test
  • Sex: Both male and female
  • Age group: Not restricted
  • Result: Within 24 hours after the sample collection

1. Overview Of The Test Package

The thyroid gland is one of the important endocrine glands of the body. Thyroid hormone affects our metabolism, it helps to maintain a stable amount of calcium in our blood, generates energy for the body's activity, supports the oxygen supply for the metabolism in organ tissues, and provokes mental activities of the nervous system. Therefore, thyroid-related diseases such as hypothyroidism, hyperthyroidism, goiter, Basedow’s goiter,… affect the patient's mobility and general health.

2.Test Subjects

People who are in the group of suspected thyroid problems should have yearly checkups
  • Individuals who show symptoms of an overactive thyroid or underactive thyroid.
  • Individuals who have a family history of thyroid conditions.
  • Individuals who involve in periodic health check.

3. This Test Package Comprises

  • Meet and consult with a specialist in general internal medicine/ cardiology/ endocrinology
  • Perform thyroid ultrasound
  • Run some blood tests

4. This Test Will Indicate The Following Stats

  • CBC
    A complete blood count (CBC) is a process that examines several components and features circulating in your blood, including white blood cells, red blood cells, and platelets. This test is considered as a screening method to determine an individual's general health status. CBC is popular in routine health check-ups, to screen for a wide range of diseases and causes in general.
  • FT3
    Triiodothyronine (T3) is a hormone that supports the action of thyroid hormone on different organs. It helps to ensure the metabolism and the operation of the functional organs in the body. The generated T3s are mostly bound to proteins. A small part of which circulates in free form (FT3). FT3 is the part responsible for the biological activity of the thyroid gland. With this fact, measuring FT3 levels in the diagnosis of thyroid diseases will make the test more reliable and accurate.

The FT3 test is indicated to evaluate thyroid function, and to monitor the effectiveness of the treatment procedure in people with thyroid disease. FT3 in normal people ranges from 3.1-6.8 pmol/L.

  • FT4
    Thyroxine (T4) is a thyroid hormone that plays a role in the overall metabolism of the body. Free Thyroxine (FT4) is the free form of T4. FT4 is biologically active, which makes measuring FT4 concentration in the diagnosis of thyroid diseases become more stable and precise.

The FT4 test is indicated to evaluate thyroid function, and to monitor the effectiveness of treatment in people with thyroid disease. FT4 in a healthy person ranges from 12-22 pmol/l.

  • TSH
    Thyroid-stimulating hormone (TSH) is produced by the pituitary gland in the brain to make and release thyroid hormones into the bloodstream. The function of TSH is to help stimulate the production and release of Triiodothyroxine (T3), Thyroxin (T4) in the body.

    Blood tests to help diagnose your current thyroid condition

    The TSH test is designated to check whether the thyroid gland is working properly. Thus, the test has a significant role in the diagnosis and monitoring of pathologies that are related to thyroid dysfunction such as hyperthyroidism, hypothyroidism, and Basedow. The TSH hormone in a human's body ranges from 0.4 to 5 mIU/L.

*Note: Laboratory results must always be correlated with the clinical findings of the patient.

5. This Test Will Frequently Indicate The Following Diagnosis

The thyroid functions normally (Healthy thyroid).

  • TSH: Normal
  • FT4: Normal
  • T3 or FT3: Normal

Some changes occur in the function of the thyroid gland due to some certain diseases (Nonthyroidal illness or Sick euthyroid syndrome).

  • TSH: Normal or decreased
  • FT4: Normal or decreased
  • T3 or FT3: Decreased

Subclinical hypothyroidism or those who are being treated for Hypothyroidism but are not getting enough thyroid hormone can also get this result.

  • TSH: Increased
  • FT4: Normal
  • T3 or FT3: Normal

Hypothyroidism due to thyroid-related problems (primary hypothyroidism).

  • TSH: Increased
  • FT4: Normal
  • T3 or FT3: Decreased

Hyperthyroidism caused by some problems of the signaling hormone from the pituitary gland (central hyperthyroidism) or due to a problem with the thyroid hormone receptors (thyroid hormone autoimmunity).

  • TSH: Normal or increased
  • FT4: Increased
  • T3 or FT3: Increased

Subclinical hyperthyroidism; this result can also be produced when the patient is hypothyroid but is being given too much thyroid hormone.

  • TSH: Decreased
  • FT4: Normal
  • T3 or FT3: Normal

Hyperthyroidism caused by the thyroid gland making too much of the thyroid hormone T3 in its active form, known as Thyrotoxicosis (or T3 Toxicosis) – uncommon result

  • TSH: Decreased
  • FT4: Normal
  • T3 or FT3: Increased

Hyperthyroidism results from the gland making too much thyroid hormones (primary hyperthyroidism)

  • TSH: Decreased
  • FT4: Increased
  • T3 or FT3: Increased

Hypothyroidism due to some diseases in the hypothalamus or the pituitary gland fails to produce one or more hormones, causing problems with the controlling of the thyroid gland (Central hypothyroidism)

  • TSH: Decreased
  • FT4: Decreased
  • T3 or FT3: Decreased

6. Related Questions

What should be kept in mind before performing a thyroid test?
  • How frequently should I ask for a thyroid function test?
    Every 6 months.
  • Should I take any precautions before the test?
    You should get enough sleep, don’t eat anything else, and avoid alcoholic drinks for about 8-10 hours before taking blood samples.

For further questions concerning Diag’s thyroid function test and other symtoms of overative or underactive thyroids, please kindly contact the customer service of Diag. Our representatives will get back to you as soon as possible.