HCG (bHCG) is a hormone that is released by the placenta to stop ovarian action (Releasing eggs) as well as preventing the mothers immune system from attacking what is essentially a foreign invader.
around 20% of it is excreted in Urine, which is why if a pee test shows the presence, then a blood test is needed to accurately determine levels.
HCG is also produced by some cancers.
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