What gives a false positive or negative result?

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As accurate as pregnancy tests have gotten these days – they are not infallible. There is still the rare occasion when a pregnancy test will give a false result. There are two types of false results:

FALSE POSITIVE

A false positive result is when the pregnancy test says that you are pregnant, but you are actually not pregnant.

Although rare, a false positive can happen for a bevy of reasons.

  • Blood or protein is present in your urine.
  • The test is picking up on drugs in your system such as tranquilizers.
  • Problems with your ovaries.
  • The test itself is faulty and throws a faint line when it should not.

You could also have a “false” positive. This is a case where you really are pregnant, but it is a non-viable pregnancy.  An ectopic pregnancy or a chemical pregnancy will both result in a positive test, but unfortunately there is no way to carry these pregnancies to term.

In a Glow community survey, answered by 55,000+ women who are trying to conceive, 18.7% said that they had gotten a false positive test result at some point of their respective journeys.

FALSE NEGATIVE

A false negative result is when the pregnancy test says that you are not pregnant, but you are actually pregnant.

A false negative pregnancy test is much more common. And can happen because:

  • You took the test too early – so there was simply not enough hCG in your urine to show up on pregnancy test. You can remedy this by waiting a few days and testing aga
  • Your urine was diluted. Meaning that you had drunk too much water or other liquids prior to taking the test. You can remedy this by testing using your urine first thing in the morning.

In a Glow community survey, answered by 1,000+ women who are trying to conceive, 65% said that they had gotten a false negative test result at some point of their respective journeys prior to getting their positive results.

GlowGPT content was prepared by staff writers at Glow with the help of AI tools. The information is for general informational purposes only and is not intended to be medical or other professional advice, treatment, or diagnosis. Always seek the advice of a qualified health provider with any questions you have regarding a medical condition. Never disregard professional medical advice, or delay in seeking it. AI systems are rapidly evolving and given the probabilistic nature of machine learning, use of this system may in some situations result output that is incorrect, incomplete, or does not accurately reflect real people, places, or facts. You should evaluate the accuracy of any output as appropriate for your use case, including by using human review of the output. We strongly recommend that you consult with a qualified health provider before making any decisions regarding your, your child’s, or any other person’s health based on information provided here.