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More Pregnancy Tests Q&As
My period is late, when should I take a home pregnancy test?

The currently available urine pregnancy home tests are very accurate and reliable at detecting early pregnancy.

They test specifically for the beta subunit of HCG, so there are few false positives (years ago they were less specific and gave false positives with elevated thyroid stimulating hormone or LH - this does not happen now) and they detect very small amounts of HCG (most detect less than 25 IU of B-HCG).

The day of the missed period the HCG level is usually above 25 IU, so home pregnancy tests are usually positive even a few days before a missed period.

The sperm meets the egg after ovulation, but the embryo takes almost a week to travel down the fallopian tube to get to the uterus. Once the embryo implants into the uterus, HCG is secreted into the bloodstream.

Theoretically, the pregnancy test can be positive as early as ten days after ovulation. We don't recommend taking pregnancy tests this early in the average patient, because you will detect chemical pregnancies that are very early miscarraiges.

Wendy Fried, M.D., FACOG, FACS, is an OB/Gyn with Northern Obstetrics and Gynecology, PC in North Hills, New York
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Disclaimer: The information provided in this document is for educational purposes only. It is not medical advice and is not intended as a substitute for medical advice. Only your own physician knows all the important details of your specific medical and personal history and should be the only one to give you advice regarding your own medical care. You should never disregard medical advice or delay seeking medical advice or treatment because of something you have read herein. If you have any questions whatsoever about your medical health or believe you have a medical problem or disease, you should contact your medical doctor or healthcare provider.

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