Thyroid Function Blood Test, from our experts to you.Dr Sam Rodgers MBBS, MRCGP
Chief Medical Officermeet our doctors
What is thyroid function test?
What does a blood test for thyroid function show?
What are the early warning signs of a thyroid condition?
How to prepare for your test
Frequently asked questions
What is the thyroid?
The thyroid is a butterfly shaped gland that sits under your Adam’s apple. It produces thyroid hormones which help to regulate your metabolism. Sometimes, the thyroid produces too many hormones, leading to an overactive thyroid (hyperthyroidism), or too few, leading to an underactive thyroid (hypothyroid).
Have a look at our Thyroid Health Guide for how your thyroid could hold the answers to better skin, losing weight and regaining your energy.
What is thyroid disease and who is at risk?
As many as 1 in 20 people are thought to have a thyroid disorder. There are a number of different conditions that can affect the normal functioning of the thyroid, including an underactive thyroid (hypothyroid), an overactive thyroid (hyperthyroidism), autoimmune disease, thyroid swelling (or a goitre), nodules or thyroid cancer.
Although anyone can develop a thyroid disorder, factors including being female or over the age of 50, and people with a family history of thyroid problems, can increase an individual’s risk of developing thyroid disease.
How often should I get a thyroid test?
How often you should take a thyroid test will depend on whether you have been diagnosed with a thyroid disorder and, importantly, whether you are experiencing symptoms.You may want to take a thyroid test if you are experiencing symptoms of an overactive or underactive thyroid or if you are managing a thyroid condition. Our Thyroid Health Guide explains what frequency of testing may be right for you, depending on your results and symptoms.
Can I test my thyroid during pregnancy?
You can test your thyroid during pregnancy as it’s important to have a well-controlled thyroid for the healthy development of the baby. If you have a thyroid condition and are planning to conceive, or when find out you’re pregnant, let your GP know so they can monitor you or take your thyroid test results to your doctor.
Thyroid results during pregnancy:
- Underactive thyroid during pregnancy – TSH level should be less than 2.5 mU/l in the first trimester and less than 3.0 mU/l in the second and third trimesters.
- Overactive thyroid during pregnancy - doses may be adjusted through regular monitoring.