Study: 9 in 11 types of pregnancy tests produce wrong results

A new study has shown that pregnancy tests often indicate wrong results.

About 45 percent of pregnancy is unintentional, and confirmation of a pregnancy is essential to women's decision making and their financial planning.

Taking a pregnancy test is very stressful, but firms assure women that their tests at home are effective 99 per cent, boosting the sale of about 20 million tests a year.

But very often, they are not almost as effective as they claim, says Washington University study St Louis (WUSTL).

Researchers found that 9 of the top 11 marks of pregnancy tests at home could sometimes give negative answers, and some even tell women that they are not pregnant while they are.

In most cases the result of tests depends on the balance of waiting five minutes before you see how many I've come to the pregnancy test.

At home, pregnancy tests reveal whether an egg has been fertilized through a hormone called a moodgoropine (HCG).

Within two weeks of fertilization, a woman's body begins producing HGC, the so - called pregnancy hormone, which is secreted by the cells in the placenta even in the early stages of its formation.

The study conducted has seen the best tests used by hospitals to contain pregnancy.

Researchers found that seven of the tests could result negative, and two were nearly negative.

One of the tests showed negative results for pregnancy of up to five percent of the time, which means that for 20 women who took the test, one of them had received negative results and had thought he was not pregnant while he was.

Only two of the 11 tests were almost accurate. Researchers haven't said the kind of tests that didn't show exact results, but they've advised pregnant women to repeat the test when they get negative and they suspect they're pregnant or to do other tests on a doctor.