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4 月 . 18, 2024 09:32 Back to list

Can a Pregnancy Test Ever Be Wrong?

For the most part, at-home pregnancy tests are a reliable way to determine whether or not you are pregnant. That said, if you miss your period, get a negative result, and still believe you are pregnant, there's a possibility that your result is a false negative—especially if you took the pregnancy test too early or did not follow the manufacturer’s instructions.

 

In fact, researchers indicate that the most common cause of inaccurate test results is taking a pregnancy test before a sufficient amount of hCG is present in your urine.7 Usually, this occurs when you have inaccurately estimated the day of your expected period. 

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Even if you are absolutely sure of the date of your last period, you can still experience considerable inter-cycle differences. It's also important to note that while at-home pregnancy tests claim to be extremely reliable—providing accurate results 99% of the time—these claims are based on laboratory testing of urine samples under ideal conditions. For this reason, IRL accuracy of at-home pregnancy tests may actually be lower. In fact, a review of published studies found that the sensitivity of home-use pregnancy tests actually declined when people tested their own urine.7

 

"At-home pregnancy tests based on urine samples are typically sufficient for people who have missed a period, or for people who can test again the following week if the first result is negative," says Dr. Armstrong. 

 

However, if it’s important to rule out pregnancy due to other upcoming health care plans or procedures, you can talk to a provider about the possibility of a serum test or a blood test, she says. These tests can help you determine if your at-home result is truly negative.

 
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When to Contact a Health Care Provider

If you have missed two or three periods in a row but continue to get a negative pregnancy test result, you should contact a health care provider. After three missed periods, most physicians will begin some kind of work-up to evaluate why you are not menstruating, says Dr. VanRooyen.

 

“An occasional missed or late period is normal over the course of our life,” adds Dr. Armstrong. “However, if you have missed two to three periods in a row, then you should consider seeing your health care provider to help identify if there is an underlying cause. It’s important to not overlook missed periods.” 

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