Measuring your thyroid function
A blood test can measure two hormones to show how well your thyroid is working.
Subclinical hypothyroidism is when the level of only one of these hormones, the thyroid stimulating hormone (TSH), is abnormal.
What affects TSH levels?
Many things can change your TSH level, including illness, medicines, supplements, age and gender.1,2
Symptoms of the thyroid not working properly (thyroid dysfunction)
Although thyroid dysfunction can cause weight gain and fatigue, these symptoms can also be caused by other factors. Many people find that changing their lifestyle (for example, eating differently and getting more sleep) can help to reduce these symptoms.
- Thyroid tests are not recommended for people who are completely well.
- Your general practitioner (GP) will recommend testing for thyroid dysfunction only if you have specific symptoms.
- If you have any concerns or questions about thyroid tests, please speak with your GP.