A reliable "marker" that a pregnancy has initiated, and that is detectable in excreted urine, is

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Quizplus · Accepted Answer

Chorionic gonadotropin (hCG) is a hormone that is secreted by the placenta shortly after implantation of the fertilized egg. It can be detected in the urine of pregnant women and is often used as a marker for confirmation of pregnancy. Progesterone and estrogen are also involved in pregnancy, but they are not typically detectable in urine. Follicle-stimulating hormone and hypothalamus releasing factors are not directly related to pregnancy.

A Reliable "Marker" That a Pregnancy Has Initiated, and That