When should you get a thyroid check?

By Dr B.C. Gupta, MD · 2026-08-10

The thyroid is a small gland in the neck that makes hormones controlling how the body uses energy. When it is not working normally, the effects can be subtle, which is why a thyroid test is common and useful.

What the tests measure

• TSH (thyroid stimulating hormone) is the main screening test. It tells the pituitary how to signal the thyroid and is the best first check.
• FT4 measures the main active thyroid hormone circulating in the blood.
• FT3 is another thyroid hormone, measured in certain situations or when FT4 is not conclusive.

When a check can be helpful

Doctors may suggest a thyroid test if you have unexplained tiredness, weight change, feeling cold or hot unusually, changes in heart rate, dry skin or hair loss. People with a family history of thyroid disease may also be screened. It is always best to mention symptoms to your doctor rather than to test on your own.

How often should you screen?

There is no single answer that fits everyone. For many people, a thyroid check is part of a routine health check and is repeated as your doctor advises. For people with a known thyroid condition or taking thyroid medicine, more frequent monitoring is often needed.

A quick practical note

A thyroid test does not usually require fasting. However, if you are having it alongside a fasting test such as a lipid profile, follow the fasting instructions for the whole visit. Confirm with the lab when you book.

This article is for general information only and is not medical advice. Always discuss your results and any health concerns with your doctor.