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By JustMommies staff

For women who are trying everything they can to get pregnant, nothing is more nerve wracking than taking a pregnancy test. With advances in technology, women are now more capable than ever to test for pregnancy sooner than waiting for a missed period. But what does it mean when a woman receives a positive test for pregnancy with one test and a negative with another?

How to use home pregnancy tests

Home pregnancy tests are a non-invasive, low cost alternative to a doctor’s office visit. They also show you results in only minutes. The results work by detecting the hormone hCG in urine. The hormone hCG is dubbed “the pregnancy” hormone as its only present in the body during pregnancy. Certain medications, specifically fertility drugs that contain hCG can alter the home pregnancy test results. Women who take medications containing hCG should contact their doctors in regards to when and how to test for pregnancy. Depending on the sensitivity of the test, some women can check for pregnancy eight days after ovulation.

Home pregnancy tests come with specific instructions on how to use them properly. Most instructions suggest waiting and using your first morning urine-where hCG levels will be higher. They also instruct women to wait a certain amount of time before reading the test. Any result after the specified time should be disregarded. In other words, if the test is read in the proper amount of time and shows a negative result and a woman rechecks the test in an hour and shows a positive result, the reading can not be considered a positive test as it was past the specified time.

Based on laboratory testing, virtually all home pregnancy tests, regardless of brand, have a 99% accuracy rate. Inaccuracies are caused most frequently by human error and failure to follow package instructions properly.

How accurate are home pregnancy tests

A very common occurrence with women is called a “chemical pregnancy.” A chemical pregnancy is when conception does take place -- the fertilized egg does implant, but the pregnancy ends rapidly. Most instances of chemical pregnancies occur before a woman even misses her period. With early pregnancy detection tests, again, some eight days after ovulation, women can receive positive results-test several days later and then have negative results. What happens in this instance is a woman was in fact pregnant but the pregnancy resulted in a miscarriage.

“False” negatives are more common than “false” positives. Women who test positive for pregnancy and then negative can call their doctors office and request a blood test. The blood test is as accurate as the urine test.

During a normal pregnancy, the level of hCG hormone doubles each day. Doctor’s can interpret hCG numbers to evaluate if a pregnancy is developing as it should.

Women who take a home pregnancy test and get a positive result should assume they are pregnant. Women who have missed their periods and have a negative pregnancy test should re-test a few days later and make sure they are following the packaging instructions properly.

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