What Is a TSH Test?

A TSH test is done to find out if your thyroid gland is working the way it should. It can tell you if it’s overactive (Hyperthyroidism) or underactive (Hypothyroidism). The test can also detect a thyroid disorder before you have any symptoms. If untreated, a thyroid disorder can cause health problems.

TSH stands for “Thyroid Stimulating Hormone” and the test measures how much of this hormone is in your blood. TSH is produced by the pituitary gland in your brain. This gland tells your thyroid to make and release the thyroid hormones into your blood.

The Test:

The TSH test involves simply drawing some blood from your body. The blood will then be analyzed in a lab.

It’s best to do this in the morning as your TSH levels can fluctuate throughout the day. No preparation is needed (such as overnight fasting). However, if you’re on certain medications, like dopamine and lithium, you may need to come off them beforehand. Check with your doctor to find out. You shouldn’t feel any pain beyond a small prick from the needle in your arm. You may have some slight bruising too.