An excellent, extremely accurate pregnancy test for early diagnosis in an easy to use midstream wand format. Human chorionic gonadotropin, or hCG, is a hormone produced by the placenta shortly after the implantation of a fertilized egg into the womb. The early appearance of hCG in both the urine and serum of pregnant women and its rapid rise in concentration during gestational growth make it an excellent marker for the early detection of pregnancy.