False Negative Pregnancy Test

A false negative pregnancy test gives you an inaccurate reading, indicating that you are not pregnant when you actually are. Many home pregnancy tests claim to be over 90% accurate, but this percentage is generally based on lab conditions and decreases when you consider other factors that can influence the outcome of the test. This applies to early response pregnancy tests as well.

Why Do False Negatives Occur?

The most common cause for a false negative pregnancy test result is the amount of human chorionic gonadotropin (hCG), also known as "the pregnancy hormone", present within the urine sample. Home pregnancy tests detect hCG at certain levels, but will fail to detect the hormone present within the body if the levels are not yet high enough. This happens when a woman takes a pregnancy test too soon. Other factors that influence the accuracy of a pregnancy test are human error, environmental conditions, failure to read that test at the designated time, expired tests, and faulty tests.

How Can I Get a More Accurate Pregnancy Test Result?

There are several ways to increase the chances of getting a more accurate pregnancy test result. Though it's tough to do so, wait for possible hCG levels to increase before taking the test, ideally 2 weeks after a missed period. Follow the test' instructions very carefully to reduce the risk or error. Store the unopened test away from moisture, heat and cold. Always read a pregnancy test within the time suggested. If you feel that a test could be faulty, obtain another, possibly a different brand. If you take a home pregnancy test that shows negative and you do not get your period, if you take another test at a later date that gives you a positive result, or if you feel that you are actually pregnant, see a medical professional. They can administer a blood test that will yield a more accurate result.