Can I get tested for hypothyroidism during my menstrual period?

Mar 28, 2025 Source: Cainiu Health
Disease description:

I recently started my menstrual period, but I currently need to have a blood test for hypothyroidism. I would like to ask, is it possible to have this test done while I am menstruating?

Doctor's answer (1)
Dr. Yang Chuanjia

Hypothyroidism, or underactive thyroid, can be diagnosed through blood testing during the menstrual period.

The laboratory test for hypothyroidism mainly involves a blood draw to assess thyroid function by measuring the levels of thyroid hormones in the blood. The menstrual period does not affect thyroid function; therefore, this test can be performed during menstruation. Blood testing will also not interfere with the normal menstrual cycle. Before the test, it is recommended to rest adequately, avoid excessive fatigue, staying up late, and high levels of mental stress to ensure the accuracy of the test results.

However, due to hormonal changes during the menstrual period, some women may experience symptoms such as fatigue and mood swings, which are similar to some symptoms of hypothyroidism and can easily lead to confusion. Therefore, when interpreting the test results, the patient's clinical presentation and other relevant factors should be considered comprehensively. If you suspect you have hypothyroidism, you can undergo the appropriate testing regardless of whether you are menstruating or not.