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Dr. Andrew Rynne

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Do Methimazole And Propranolol Cause False Positive Pregnancy Test Results?

Hello I have been on methimazole and propananol for about seven months now. I was suppose to start today and since I am usually a few days early I went ahead and took a pregnancy test it came back positive and I was wondering if it could be a false positive from the medicine? Thanks for your time.
posted on Tue, 13 Mar 2018
Twitter Sat, 7 Apr 2018 Answered on
Twitter Sat, 21 Apr 2018 Last reviewed on
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General & Family Physician,  's  Response
Hello,

The given drugs are not known to cause a false positive pregnancy test.

For a woman with a regular period, conception typically occurs about 11 to 21 days after the first day of the last period. A positive pregnancy test can be detected in urine or blood after implantation, which occurs on average, about 6 to 12 days after fertilization.

So, the urine pregnancy test can be positive as early as 4 days before the next expected period.

You are advised to kindly repeat the test and consult your doctor.

Hope I have answered your query. Let me know if I can assist you further.

Regards,
Dr. Mohammed Taher Ali
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Do Methimazole And Propranolol Cause False Positive Pregnancy Test Results?

Hello, The given drugs are not known to cause a false positive pregnancy test. For a woman with a regular period, conception typically occurs about 11 to 21 days after the first day of the last period. A positive pregnancy test can be detected in urine or blood after implantation, which occurs on average, about 6 to 12 days after fertilization. So, the urine pregnancy test can be positive as early as 4 days before the next expected period. You are advised to kindly repeat the test and consult your doctor. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Mohammed Taher Ali