False Negative Blood Home Pregnancy test, Reason or Causes and How Common is it
How common is a false negative pregnancy test
There are several reasons for False negative pregnancy test to take place. On the other hand, it is important to know that it is rather rare for false negative pregnancy test to happen. Most pregnancy tests have high success rates, mostly 97%-99% precision range. It is also rarer for a false negative blood pregnancy test to occur. Here are some of the common reasons that can Cause false negative pregnancy test results.
Reasons or causes for false negative pregnancy test
Taking pregnancy test to early
One of the most usual reasons for a false negative home pregnancy test result is making an early detection attempt. Pregnancy tests differ in sensitivity, meaning how soon they’ll be able to detect the hCG or Human Chorionic Gonadotropin in the urine. There’s a possibility that even though your ovum is already fertilized, your body has not yet started to secret the hCG for the pregnancy test to measure, giving a pregnancy test wrong result. Your body needs some time for the hormone to rise in a level high enough to be detected in the pregnancy test.
It is possible that drinking lots of water and then testing late in the day can affect the test’s accuracy and can be the reason for you to get false negative pregnancy test. Most manufacturers recommend testing in the morning to avoid getting false negative pregnancy test results. However, this must only be an issue in the first few days after missing your period. After that, having a test even late in the day should provide a positive result.
Errors in using the pregnancy test
Another reason for you to obtain a false negative pregnancy test is if you make some errors while using the test strip. You may not be putting enough urine on the test that’s why even if you are pregnant but negative test result showed in the strip.
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To make sure that you will not get false negative pregnancy test, it is important to read the test results in the specified reaction time. If you’ll let the test sit longer than the stipulated reaction time, the pregnancy test is invalid. This can cause the test to show false negative pregnancy test results.
If you got negative results in your pregnancy test but you think that you are pregnant, then wait a few more days and try again. Moreover, if you got different test results on several pregnancy tests, it is better to undergo a blood test to obtain an accurate result.
Should You Get a Pregnancy Blood Test?
Wondering whether to trust an at-home pregnancy test or head to the doctor for a blood draw? Here’s what you need to know if you’re trying to confirm that you’re pregnant.
By Elena Donovan Mauer
When it comes to choosing between a urine test — the kind of at-home pregnancy test you can easily find at your local drugstore — and a pregnancy blood test, the biggest difference is sensitivity. Although a home pregnancy test can usually pick up a concentration of about 50 units of hCG (the pregnancy hormone human chorionic gonadotropin), a pregnancy blood test can detect as little as 5 units of hCG, explains Daniel Roshan, M. D., ob-gyn at Rosh Maternal-Fetal Medicine in New York City.
That sensitivity can make a big difference if you want or need to know whether or not you’re pregnant very early, Dr. Roshan says. “If you do a pregnancy test before you miss your period, the result may be negative with a urine test but positive with a blood test.”
How Accurate are Pregnancy Tests?
Early pregnancy tests aren’t usually necessary, but they can make a difference for women at higher risk for miscarriage or ectopic pregnancy. Ectopic pregnancy, also known as tubal pregnancy, occurs when the fertilized egg remains in the fallopian tubes, instead of in the uterus, where it should be. “A patient would go to the doctor right away if they had a previous miscarriage so the doctor can check their blood and [she] can have a sonogram to look inside and see that everything is okay and it’s a healthy pregnancy,” says Dr. Roshan.
For most women, a pregnancy blood test isn’t necessary. If you’ve taken a home pregnancy test and gotten a positive result, your ob-gyn will likely see you around eight weeks after your last menstrual period and confirm your pregnancy with a transvaginal ultrasound. Sometimes, however, a doctor can’t detect the pregnancy on an ultrasound right away, and in that case she may order a blood pregnancy test, says Cristina Perez, M. D., an ob-gyn at the Women’s Specialists of Houston at Texas Children’s Pavilion for Women.
The blood test will consist of at least two blood draws, about 48 hours apart. Early in pregnancy, your hCG levels should double approximately every 48 hours. By seeing the change in hCG levels, the doctor can evaluate for a miscarriage or ectopic pregnancy, or confirm that your pregnancy is progressing healthily.
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Positive Pregnancy Test Then Negative?
Taking a home pregnancy test that turns positive after you use it provides you with a wonderful feeling. However, it’s not uncommon for many women to want to take a second or third test just to make sure that her eyes aren’t playing tricks on her. While there are very few false positives, sometimes it happens that a woman receives a positive result on one test and a negative result on another. Before you panic, it’s imperative that you understand there are many instances in which this could occur.
One reason you might receive a positive pregnancy test the first time and a negative the second is that you are not using the test correctly the second time. It happens. If you use a different type of test, you might forgo reading the instructions because you feel that you already know how to use a pregnancy test. However, if that test has different requirements for use, you could end up using it incorrectly and seeing a negative result. It is always in your best interest to read the instructions provided with your pregnancy test prior to using it.
You might have used a defective test. All pregnancy tests come with test lines and/or timers. For example, if you use a traditional test in which you look for a second line to appear to tell you that you’re pregnant, you have to ensure the first line appears. If it does not appear after your urine hits the absorbent tip, the test is not working correctly and will not provide you with the correct result. If you use a digital pregnancy test, make sure that there is a little timer in the screen that blinks while you wait for your results to appear. If there is not, your test could be bad.
Another reason you might not receive a positive pregnancy test the second time you test is that you did not use your first urine of the morning. If you’re very early in your pregnancy, you need to use your first morning urine. Eating and drinking throughout the day can dilute your urine and cause your test not to detect the pregnancy hormone in your urine.
Positive Pregnancy Test Now Negative No Bleeding?
The good news is that if you took a pregnancy test and it was positive before you took a secondary negative test but you are not bleeding, you are probably still pregnant. Assuming that your positive test was not the result of a test taken while you are on fertility medication or right after a miscarriage, chances of it being a false negative are very slim.
If you did take a positive pregnancy test and then a negative test later, you could have done something wrong. You could have used an expired test. You could have used a broken test. You could have used urine that was too diluted for your test to find the hCG within it.
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