Accuracy of Home Pregnancy Tests

Home pregnancy tests (HPTs) are very accurate. Most brands of HPTs say they are 97% to 99% accurate, but this can vary with actual use. Each brand varies in how sensitive it is in picking up the pregnancy hormone hCG. If a test is not done correctly, it will be less accurate. And, always check the package to make sure it is not past its expiration date - if it is, it will not be accurate. Most brands of HPTs tell users to do the test again in a few days, no matter what the results.

If you use an HPT too early in your pregnancy, you may not have enough of the pregnancy hormone hCG in your urine to have a positive test result. Most HPTs will be accurate if you test yourself around the time your period is due (about 2 weeks after you ovulate, or release an egg from your ovary). You can get a negative test result if you are not pregnant or if you ovulated later than you thought you did. You may also have problems with the pregnancy, which affects the amount of hCG you have in your urine. If your HPT is negative, test yourself again within a few days to 1 week. If you keep getting a negative result and think you are pregnant, talk with a health care provider right away.