TSH test

TSH Test

A TSH test is a simple medical test used to measure the amount of a hormone known as thryoid-stimulating hormone (TSH) in someone’s bloodstream. TSH is produced by the pituitary gland, located in the brain, and it helps control the body’s production of the thyroid hormones that are essential for regulating the metabolism and energy production in the body.


No special preparation is required before a TSH test. You can eat and drink as you usually would beforehand. However, in some cases, the doctor may ask that you do not drink or eat anything for at least an hour before the test.


The test is done by taking a small blood sample and sending it to a laboratory for analysis. The sample can be taken from your arm, hand, or the back of your hand. The test is usually done as an outpatient procedure in the doctor’s office and does not typically take much time.


  • TSH Test
  • Free T4 Test
  • Free T3 Test
  • Thyroid Antibodies Test


The TSH test has very few risks, as only a small blood sample is required. The most common potential risks include pain or bruising from the needle, bleeding, infection, fainting, or allergic reaction to the needle.

Why It's Done

Doctors may order a TSH test to diagnose thyroid disorders, such as hypothyroidism or hyperthyroidism. The test can also help doctors monitor thyroid disorders, such as Graves’ disease and Hashimoto’s thyroiditis, over time. The TSH test may also be used to help diagnose infertility or to assess fertility treatments.

When To Do It

Your doctor may recommend having a TSH test if you are experiencing symptoms that could be caused by a thyroid disorder, such as fatigue, weight gain or loss, dry skin, anxiety, or trouble sleeping. Your doctor may also recommend the test if you are taking medications that could affect the thyroid, such as lithium or other psychiatric medications, or if you have a family history of thyroid disorders.