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Detection of human chorionic gonadotrophin (hCG) in urine or serum is an easy first method of diagnosis of pregnancy. hCG can be detected as early as the sixth day after conception. hCG is also an important tumor marker because it is produced by some kinds of tumor, such as: seminoma, choriocarcinoma, germ cell tumors, hydatidiform mole formation, teratoma with elements of choriocarcinoma, and islet cell tumor
Pregnancy detection kits containing a strip or card impregnated with anti-hCG globulin are readily available. The test is executed by immersing the proper end of the strip in urine or sprinkling three drops of urine on the indicated site of a card. The result is readable within two to three minutes.
Video HCG pregnancy strip test
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Source of the article : Wikipedia