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Well it depends on the test. When a woman gets pregnant she produces certain hormones which are found the urine. The pregnancies tests have monoclonal antibodies which connent to those hormones and ''detect'' them. The sensitivity of the test lies on the quality of those monoclonal antibodies. The more specific those antibodies are, the more sensitive is the test. Actually i think there are some tests which can be taken from the first ''delay'' day of normal menstruation, but i don't know how accurate they are. Hope i helped u. Bye

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16y ago

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