TBG blood test

TBG Blood Test: Overview and Preparation

TBG (Thyroid Binding Globulin) is a blood test that helps to measure the amount of thyroid hormones present in the blood. This test is performed to diagnose and monitor conditions related to the thyroid gland, such as thyroid cancer, hypothyroidism, and hyperthyroidism. It also helps to detect autoimmune diseases and hormonal changes during pregnancy.

Before taking the TBG test, it is important to inform the healthcare provider about any kind of medication taken, with or without a doctor’s prescription. A few weeks before the test, it is essential to stop all kinds of drugs that can interfere with the results. Some of these drugs are steroids, estrogen, oral contraceptives, and barbiturates. In addition, patients must also inform the doctor if they are pregnant, as hormone levels fluctuate during pregnancy and it can affect the test results.

Types of TBG Blood Test

There are two types of TBG blood tests available:

  • Total Thyroid Binding Globulin (TBG) – this test measures all of the TBG that is present in the body.
  • Free Thyroid Binding Globulin (fT3) – this test measures the amount of TBG not bound to any thyroid hormone.

TBG Test Procedure

The TBG test is a simple procedure. It is usually done in the doctor’s office and does not require any special preparation. The patient’s arm is usually cleaned and then a small tube of blood is taken from the arm. The sample is then sent to a lab for analysis. The results of the test are usually available within a few days.

Risks of Taking a TBG Test

The TBG test is considered a safe procedure and does not involve any major risks. There may be mild discomfort when the needle is inserted in the arm and sometimes there may be some bruising and swelling at the needle insertion site. However, these effects are usually temporary and will go away after a few days.

Why is a TBG Test Done?

TBG test is done to measure the amount of thyroid hormones in the blood and to diagnose and monitor disorders related to the thyroid, such as hypothyroidism, hyperthyroidism, and thyroid cancer. This test is also done to detect autoimmune diseases and check hormone levels during pregnancy.

When is a TBG Test Done?

A TBG test is usually done if the patient is experiencing any of the following symptoms: fatigue, weight gain/loss, changes in appetite, changes in mood, dry skin, nausea, and constipation. It is also done to monitor treatment of thyroid-related disorders.