Everything You Need to Know About Thyroid Function Test (TFT)


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Did you know that thyroid hormones play a huge role in regulating the body’s metabolism, brain development, energy production, and even mood? It’s no wonder then why getting your thyroid function tested (TFT) is so important! The thyroid is one of the most vital organs in the human body, so it’s important to ensure that it’s functioning properly.

But what exactly does a TFT entail and what should you expect from it? In this blog post, we’ll explore all aspects of a TFT – from testing procedures to results interpretation – so that you can be better informed about your health. Read on to learn more about this important test and how it can help you stay healthy.

What is TFT?

A thyroid function test (TFT) is a blood test used to measure how well the thyroid gland is working. It produces hormones that regulate many body functions, including metabolism (the way the body uses energy), heart rate, and body temperature.

The most common reason for doing a TFT is to check for hypothyroidism or hyperthyroidism. When the thyroid gland doesn’t make enough hormones, the condition is known as hypothyroidism. This can cause fatigue, weight gain, and depression. Hyperthyroidism is when the thyroid gland makes too much hormone. This can cause anxiety, weight loss, and irritability.

A TFT measures three main things: thyroxine (T4), triiodothyronine (T3), and thyrotropin (TSH). T4 and T3 are the two main hormones made by the thyroid gland. TSH is made by the pituitary gland and regulates how much hormone the thyroid gland should make.

The results of a TFT can help your healthcare provider diagnose and treat problems with the thyroid gland.

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How to prepare for TFT?

A thyroid function test (TFT) is a blood test that measures the level of thyroid hormones in your body. Thyroid hormones are responsible for regulating metabolism, so the purpose of a TFT is to determine whether your thyroid is functioning properly. Blood test laboratory in Patiala

There are two types of thyroid function tests: free thyroxine (FT4) and triiodothyronine (T3). Your doctor will likely order both tests to get a complete picture of your thyroid function.

In preparation for a TFT, you should not eat or drink anything for at least 8 hours before the test. This includes coffee, tea, soda, energy drinks, and alcohol. You should also avoid taking any medications that contain iodine, such as some multivitamins and cold remedies.

If you have any questions about how to prepare for your TFT, be sure to ask your doctor or the medical staff at the facility where you will be having the test. Consult our experts at Rapid Laboratory, the best medical testing laboratory in Punjab.

What are the normal ranges for TFT?

The thyroid function test (TFT) is a blood test used to measure the levels of thyroxine (T4) and triiodothyronine (T3), hormones produced by the thyroid gland. The test can also measure the level of thyroid-stimulating hormone (TSH), a hormone produced by the pituitary gland that regulates the production of T3 and T4.

The normal range for T4 is 4.5-12.0 µg/dL, while the normal range for T3 is 60-181 ng/dL. The normal range for TSH is 0.4-4.0 mIU/L.

Abnormal results of TFT

An abnormal result on a thyroid function test (TFT) can indicate many different things. The most common cause of an abnormal TFT is an autoimmune disease called Hashimoto’s thyroiditis. Hashimoto’s thyroiditis is the most common form of thyroiditis, and it occurs when the body’s immune system attacks the thyroid gland.

This can cause the gland to become inflamed and can eventually lead to hypothyroidism (a condition in which the body does not produce enough thyroid hormone). Other causes of an abnormal TFT include Graves’ disease (an autoimmune disease that affects the thyroid gland), goiters (enlarged thyroid glands), and thyroid cancer. Treatment for an abnormal TFT will depend on the underlying cause.

Causes of abnormal TFT results

There are many potential causes of abnormal TFT results. Factors that can affect the thyroid gland include:

  • Iodine deficiency
  • Autoimmune diseases
  • Use of certain medications such as lithium or amiodarone
  • Inflammation of the thyroid gland (thyroiditis)
  • Benign or malignant tumors of the thyroid gland

If you have abnormal TFT results, it is important to work with your healthcare provider to determine the cause.

Treatment for abnormal TFT results

If your thyroid function test results are abnormal, your doctor will likely recommend treatment. The most common treatment for an abnormal TFT is levothyroxine, a synthetic form of the hormone thyroxine. 

Levothyroxine is taken as a pill once a day, and it replaces the hormone that your body isn’t making enough of. Other treatments for an abnormal TFT include Radioactive iodine therapy and surgery. 

Radioactive iodine therapy involves taking a pill that contains a small amount of radioactive material. This material helps to destroy the overactive thyroid cells and shrink the gland. Surgery is another option, but it’s usually only recommended if other treatments haven’t worked.


A thyroid function test is an important tool that helps diagnose and monitor many conditions related to the thyroid gland. By understanding what TFT measures, why it’s done, and what the results mean, you can help ensure your medical care provider is able to get an accurate picture of your health.

With this information in hand, they can determine what treatment options are most suitable for you. Ultimately, regular TFTs will allow for early detection of any potential problems related to your thyroid so that appropriate interventions can be taken promptly and effectively.

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