Thyroid function tests

What Are Thyroid Function Tests

Thyroid function tests are a group of blood tests used to measure how well the thyroid gland is producing and releasing thyroid hormones. The tests measure levels of TSH (thyroid stimulating hormone) and two key hormones, T3 and T4, which are released from the thyroid gland. These hormones control and affect the body’s metabolism, heart rate, energy levels, and body temperature. Abnormal levels of thyroid hormones may indicate an underactive or overactive thyroid gland. An underactive thyroid can cause fatigue, weight gain and cold sensitivity. In contrast, an overactive thyroid can cause anxiety, heart palpitations and weight loss.

Why Are Thyroid Function Tests Done?

Thyroid function tests are usually done to help diagnose and/or manage thyroid diseases. They are often done in people experiencing symptoms like fatigue, weight changes, changes in mood, difficulty concentrating, and hair loss. They are also sometimes ordered to check on medications, such as levothyroxine, used to treat an overactive or underactive thyroid.

Preparation For Thyroid Function Tests

There is no preparation required for thyroid function tests. Your doctor may ask you to stop taking any thyroid medications you are taking, if they are relative. However, talk to your doctor before stopping any medicines.

Procedure Of Thyroid Function Tests

Thyroid function tests are done by taking a small sample of blood from your arm. The sample is then sent to the lab for analysis of your hormone levels. The results of the tests will be available in a few days.

Types Of Thyroid Function Tests

  • TSH (Thyroid Stimulating Hormone): This test measures the amount of TSH in the blood. High levels of TSH may suggest an underactive thyroid, while low levels may suggest an overactive thyroid.
  • T4 (Thyroxine): This test measures the amount of T4 (a type of thyroid hormone) in the blood. High levels may suggest an overactive thyroid, while low levels may suggest an underactive thyroid.
  • T3 (Triiodothyronine): This test measures the amount of T3 (a type of thyroid hormone) in the blood. High levels may suggest an overactive thyroid, while low levels may suggest an underactive thyroid.

Risks Of Thyroid Function Tests

Thyroid function tests are generally safe, with few risks. The most common risk is that of a sore arm or bruising where the blood sample was taken. This is usually temporary and will disappear within a few days.

When To Do Thyroid Function Tests?

Thyroid function tests are done to diagnose and/or manage thyroid diseases. They may be ordered when someone is experiencing signs and symptoms of a thyroid disorder, such as fatigue, weight changes, changes in mood, difficulty concentrating, and hair loss. They may also be ordered to assess the effectiveness of medications used to treat an overactive or underactive thyroid.

Conclusion

Thyroid function tests are a group of blood tests used to measure how well the thyroid gland is producing and releasing thyroid hormones. These tests measure levels of TSH, T3, and T4, and can help diagnose and manage thyroid diseases. The tests are usually done without any preparation and involve taking a small sample of blood from your arm. There are few risks associated with the tests, and they can be used to evaluate the effectiveness of medications used to treat an overactive or underactive thyroid.

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