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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Does Periods At The Time Of Thyroid Test Lead To Altered Results?

hii today i did a blood tests and thyroid test because i have been suffering from fatique and tiredness for about two months,but i am abiut to have my period in two days ir maybe sooner,is tgat goung to effectcand change the results of the tests and apear inaccurate?
i fasted for 15 hours before the tests
thank you
Fri, 1 Apr 2016
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Endocrinologist,  's  Response
Hello,
Thank you for asking on HCM! I can understand your concern and i am trying to inform you about your query.
The thyroid hormones are not affected by the hormonal changes that occur during different phases of menstrual cycles. Also, it is not necessary to be fasting when checking the thyroid hormones, you may take the blood at any hour of the day. They do not differ with the circadian rhythm.
It is important to check the three hormones TSH, FT4 and FT3 in order to have an accurate diagnosis.
Hope the information is helpful.
Wishing you good health.

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Does Periods At The Time Of Thyroid Test Lead To Altered Results?

Hello, Thank you for asking on HCM! I can understand your concern and i am trying to inform you about your query. The thyroid hormones are not affected by the hormonal changes that occur during different phases of menstrual cycles. Also, it is not necessary to be fasting when checking the thyroid hormones, you may take the blood at any hour of the day. They do not differ with the circadian rhythm. It is important to check the three hormones TSH, FT4 and FT3 in order to have an accurate diagnosis. Hope the information is helpful. Wishing you good health.