How acccurate are pregnancy tests? Get the facts

how accurate are pregnancy tests

You are probably concerned whenever you have decided to buy one of the best home pregnancy tests and wonder about the outcome. All of us who have been in the situation know the feeling and especially also the feeling after using the test, one special thing will cross your mind “How accurate are pregnancy tests?”

Quite a few of these pregnancy tests claim to be totally accurate even before your missed period. But to know the best result of how soon you can take a pregnancy test would be around one week after your missed period.

Pregnancy Symptoms

To get a lot more of the pregnancy symptoms you should read my article about the first signs of pregnancy:

This sign is noticeable within a week of conception.

It is due to pregnancy hormones activated after you have conceived within your womb. These hormones increase the supply of blood to your breast thereby causing a tingling sensation around the nipples.

This sign becomes less and less noticeable as your pregnancy progresses. This is because your nipples become used to the increased blood flow.

After reading the article you should have a rather good idea all the symptoms are there or not of the pregnancy.

How Accurate are Home Pregnancy Tests

There are quite a few different home pregnancy tests on the market but you should stick to using the best home pregnancy on the market because these are proven to work.

As already stated these tests claims to have a 99% percent accuracy which really isn’t true according to research done at Obstetrics and Gynecology, University of New Mexico, Albuquerque in 2001 and published on The American Association for Clinical Chemistry:

Background: Home pregnancy testing devices claim >99% diagnostic accuracy for pregnancy and utility on the first day of the missed menses or earlier. We investigated the forms of human chorionic gonadotropin (hCG) in early pregnancy urines, the diagnostic accuracy claim, and the abilities of 15 devices to detect the different forms of hCG.

Methods: We measured the concentrations of regular hCG and hyperglycosylated hCG (H-hCG, a large hCG variant) in 592 urines. Fifteen home devices were tested according to manufacturers’ instructions with regular hCG and H-hCG diluted in urine.

Results: H-hCG was the principal hCG-related molecule in pregnancy urine in the 2 weeks following the missed menses (61% and 50% of total immunoreactivity in the 4th and 5th completed weeks of pregnancy, respectively). Of 15 home test devices, 2 had a detection limit of 6.3 IU/L for regular hCG, but poorer detection of H-hCG. Two devices detected 13 IU/L regular hCG, one with similar detection and one with poorer detection of H-hCG. Ten devices detected 25 IU/L regular hCG, 6 with poorer detection of H-hCG. One device detected 50 IU/L regular hCG, but better detected H-hCG. Overall, 9 of 15 devices did not detect H-hCG as well as regular hCG.

Conclusions: H-hCG is the principal hCG immunoreactivity in early pregnancy urine. Home tests vary widely in detection limits for regular hCG (6.3–50 IU/L), and 9 of 15 devices (60%) had poorer detection limits for H-hCG than for hCG. The variation in analytical detection limits appears contradictory to the common claim for all devices of >99% detection of pregnancy on the first day of the missed menses or earlier. We suggest that manufacturers calibrate devices for both hCG and H-hCG and determine the detection rates for pregnancy rather than the proportion of positive results at arbitrary hCG concentrations.

As you can see from the research then 99% is not quite accurate but the proven test considered reliable when used correctly.

How Accurate are Blood Pregnancy Tests

Another pregnancy test you could use would be a blood pregnancy test. A blood test can detect HCG earlier than a home pregnancy test can and the timeline would be around 8-10 days after ovulation.

There are normally used two kinds of blood tests where the quantitative blood test is a very accurate test where the qualitative blood test has the same accuracy as a home pregnancy test.

Are Pregnancy Tests Ever Wrong

Pregnancy tests can be wrong and if you for instance get a false result, take another test the day after.

Things that could give false negative results would be if you drank too much fluid before taking the test.

You could take a test to early and this would get a false negative result.

Other things that can interfere with the test could be fertility drugs or medications that contain hCG, but you shouldn’t be concerned that birth control pills or antibiotics interfer with the result.