So, the first think to know is that these tests detect the pregnancy by measuring the presence of a hormone in the urine. The hormone is called chorionic gonadotropin, and is a telltale hormone. But how can this hormone tell you if you are pregnant or not? Well, this hormone is produced by the placenta. When the egg is fertilized and finds it' s place in the uterus, this hormone is released into the bloodstream. This usually happens about six days after the egg has been fertilized. From that point the amount of this hormone in the body is doubled every two days. So in about fifteen days after the fertilization took place, the home pregnancy test should be able to indicate if your are pregnant or not. But it all depends on the test. It is said that most of them are not sensitive enough to detect a pregnancy even at that stage. For better and certain results it is indicated you should take the test a week after your the day that you were expecting your period.
It was believed that home pregnancy test were very accurate, almost 100 percent, even taken the day when a woman misses her period. Later studies have shown that this belief was misleading. The amount of the telltale hormone in the urine can differ from a woman to another very much. It can be different in any given days after the implantation had taken place. Studies have been made on different groups of women, and reaschers discovered that the home pregnancy tests are not sensitive enough to detect a pregnancy in the first day that the woman missed her period. It worked for almost 15 % of the tested woman. But the the same home pregnancy tests showed to be very precise when taken seven days after the menstrual period was expected.
Of course when reading this, one would wonder why these tests claim to be so accurate, if they are not? Well the fact is that the ninetynine percent accuracy that this tests pretend to be is because the sensibility of the tests can detect a pregnancy, but not in it's first days or in the first day of the missed period. The home pregnancy tests can determine a pregnancy, but it matters when this test is taken. To find out how to choose a pregnancy test and use it, be sure to read part two.
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After reading the first part of this article, you should be familiar by now with how home pregnancy tests work. So after knowing how they can detect a pregnancy and how accurate are they, one should wonder how do you know which are more sensitive and which are not. well, unfortunately this is not an easy question to answer. There are not many tests that can determine a pregnancy when hormone levels are very low. Some home pregnancy tests come with some information on their sensitivity. They tell you what is the lowest concentration of the hormone that the test can measure. This is found in ml of hormone per ml of urine. So if one test claims to detect the pregnancy hormone at 30 ml/ ml an one 60, then the first one should be more sensitive. But this is only in theory. There are different kinds of telltale hormones, for different stages of pregnancy and the test does not say what kind of hormone it can detect that is the most relevant at the begining of the pregnancy.
Another thing to know about home pregnancy tests and maybe the most important is how to use it. First of all one must definitely look at the expiration date. It is critical that this test is valid. Another important aspect before using is the place where you kept the test. If the test gets worm or moist, it can deteriorate. If things are looking well until this point, the next thing to do is read the instructions. They may vary from a brand to another. In some pregnancy tests it is only necessary to pee onto the pregnancy detecting stick, in other to pee in a recipient and then take a sample from there and use it, others can use both ways.
The second thing that can be different from one test to another is how they show the result. Some show plus or minus colored in red, others blue or pink. There is also the matter of how much time one must wait. This is why it is recommended to read the instructions very carefully.
If the first pregnancy test comes back negative, do not be hasty. Wait a day or two and take it again, in the morning for better results. If this two show negative, but you still don' t have your period, visit a doctor right away.
On the other hand, a test may show a positive result, and then your period could come a few days later. This happens because there was actually a fertilized egg that started to produce the hormone, but afterwards did not survive for some reason. This is a common this, that happens to almost a half of the fertilized eggs. This type of pregnancies are called chemical pregnancies.
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