The result appears typically after several (5 to 10) minutes. It is crucial to carefully read the instruction included by the producer of the testing set before taking the test to assure its effectiveness. A woman either has to urinate into a plastic cup and then place a small amount of urine on a testing stick using a dropper, or urinate directly on a testing stick, depending on the producer. The most popular hCG pregnancy test for at-home use is the one requiring a sample of the womans urine. Needless to say, that before researchers fully understood the processes behind this phenomena, the poor Xenophus toads were massively exported and used as a pregnancy test. They discovered that injecting urine of a pregnant woman (which, as we already know, contains hCG) into a Xenopus toad caused the toad to ovulate. Hillel Shapiro and Harry Zwarenstein developed the first version of the hCG pregnancy test at the beginning of the 1930s. It means that, in spite of the presence of a developing pregnancy inside a woman's body, the pregnancy test may come back negative. Although the hCG marker is very sensitive, you have to keep in mind that if the test occurs during these 8–10 days after the fertilization, it could give a falsely negative result. It can already be detected in the blood eight days after the fertilization of the egg, and ten days for urine. HCG is a very reliable marker to indicate that someone is pregnant. This value is calculated according to the following formula: The average number of hours required for your hCG levels to double. Found as the difference between the two hCG levels divided by the result of the first measurement, this value shows you the relative increase that has occurred between the two measurements. The result should be positive if not, it means that your hCG levels are falling. This is simply the first hCG level subtracted from the second hCG level. Once you have provided our hCG levels calculator with these values, it will automatically calculate all of the remaining numbers. The time that has passed between the first and the second measurement. Similarly, this is the result of the second hCG test, taken after some time, at least a few days.
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