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Can Blood Tests for Pregnancy be Wrong?
on Jan 05, 2013
by Maureen Stephens, BS, RN
Sometimes things do happen that cause a blood test to give inaccurate results. It is rare, but it does happen. Find out how.
Most people think that blood pregnancy tests are 100% accurate, all the time. While we know that blood pregnancy tests done at a doctor’s office are much more accurate and reliable than home pregnancy tests, can they ever be wrong? Experts say that blood pregnancy tests are as much as 99% accurate. Of course, that leaves room for a tiny bit of error. So, what can happen to make blood pregnancy tests turn out wrong? Read on to find out. Claim Your 20 Free Pregnancy Tests – Click Here
A blood pregnancy test can only detect hCG in the blood at around seven days post-conception. If a pregnancy test is done before that seven days is up, the test might not be able to detect the hCG yet. This can cause a negative result when a woman is really pregnant.
Sometimes, a woman will have extremely high levels of hCG in her blood when she is not actually pregnant. This can lead to a false positive pregnancy test. Some of the reasons for high hCG levels can be a tumor, ovarian cancer, a multiple pregnancy, blood or protein in the urine, or certain medications.
Sometimes a woman will have low or even negative hCG levels. There can be a few reasons for this. Some reasons for a low or negative hCG level can be an ectopic pregnancy, or even a miscarriage. Your doctor can help you determine the reason for low hCG levels.
Sometimes a woman can get a positive blood pregnancy test when she is not actually pregnant. This can sometimes be called a “chemical pregnancy“. A chemical pregnancy is basically a very early miscarriage. Most women do not even know they were pregnant when they have a chemical pregnancy. However, if a woman has a blood test done very near the time that she miscarried, she might have a positive test result when she is not really pregnant.
As you can see, sometimes things do happen that cause a blood test to give inaccurate results. It is rare, but it does happen. If you have a blood test and you are concerned about the accuracy of that test, just ask your doctor to perform another one to make sure.
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Ms. Stephens has spent over twenty years in the healthcare world, specializing in obstretical and medical/surgical nursing. She joined ConceiveEasy as she has a strong interest in educating and empowering women and promoting fertility awareness.