A false negative pregnancy test is a pregnancy hCG test which is negative when in fact you are pregnant. You are pregnant but you have a negative pregnancy test.
- What is a false negative pregnancy test?
- A false negative hCG pregnancy test means that your pregnancy test is negative but you are pregnant.
- What is a false positive pregnancy test?
- A false positive hCG pregnancy test means that your pregnancy test is positive but you are not pregnant.
Home Pregnancy Tests
|Pregnancy Test Negative||True Negative||False Negative|
|Pregnancy Test Positive||False Positive||True Positive!!|
False Negative hCG Pregnancy Tests And What Causes Them
There are at least 3 reasons why you may get a false negative pregnancy test:
1.You tested too early
If you take a home pregnancy test too early, you may get a false negative result. This is the major reason for a false negative test
2.The test strips had too low sensitivity
Urine pregnancy tests vary in their sensitivity. That means they become positive and they can detect the hormone Human Chorionic Gonadotropin (hCG) in your urine at different levels. Test strips and midstream tests and digital tests have different sensitivities which means they show a positive at different amounts of hCG in your urine. Some HPTs are highly "sensitive" to hCG and detect a relatively low amount of hCG, like 20 mIU/ml. Once the urine shows 20 mIU/ml or higher, the test becomes positive. Other HPTs have a lower sensitivity to hCG and detect hCG only at much higher amounts of hCG, 50 mIU/ml or 100 mIU/ml for example. For example, if your urine has 40 mIU/ml hCGbut you use a strip that detects only 50 mIU/ml hCG then your test will be negative and does not become positive until you reach a higher level.
3. The urine is diluted
If your urine is diluted, if for example you drank a lot of liquid, then the concentration of hCG in your urine becomes less and the test may be negative. That is why most manufacturers recommend that you test with more concentrated urine, first morning urine.
It is possible that although your ovum might be fertilized, meaning you may be pregnant, but your body has not started secreting enough Human Chorionic Gonadotropin (hCG) for the test to measure. Your body needs time for the hormone to rise to a high enough level to be detected in a test.
If the home pregnancy test shows negative results but you still think you could be pregnant, wait a few days and try again. Test in the morning. A negative result can mean that you are not pregnant, that you took the test too early or you took the test wrong, or that the urine is too diluted or the test strip is not sensitive enough. Also, if you have received different answers on multiple pregnancy tests, it is recommended that you get a blood test done to get an accurate answer.
For most pregnant women the urine pregnancy test does not detect enough hCG until 1-2 days before missing the period. And in 1 of 4 pregnant women the home urine pregnancy test does not become positive until after they miss their period. Most false negative pregnancy tests occur when testing is done too early. You are pregnant but you test negative because there is not enough of the pregnancy hormone hCG in your body and especially your urine to be detected.
Quantitative blood tests and the most sensitive urine tests usually detect hCG shortly after implantation, which can occur anywhere from 6 to 12 days after ovulation. Beta hCG levels rise exponentially in the first two months or so of pregnancy so the earlier the test is performed, the higher the chance of a false negative result. Less sensitive urine tests and qualitative blood tests may not detect pregnancy until three or four days after implantation. Menstruation occurs on average 14 days after ovulation, so the likelihood of a false negative is low once a menstrual period is late.