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A member asked:
Is hcg produced at time of fertilization (when sperm meets egg) or only when implantation occurs?
2 doctors weighed in across 2 answers
Before implantation: Hcg is secreted by the embryo after fertilization but before implantation. The embryo reaches the blastocyst stage before it implants, with an inner cells that becomes the fetus, and trophoblast cells that make HCG and become part of the placenta. A little HCG is produced before implantation, but by the time we can *detect* HCG with a blood or urine pregnancy test implantation has already occurred.
Answered 2/1/2020
5.5k views
A little after: Hcg can be screted by the embryo after fertilization and before implantation. However, HCG is likely detected by testing after implantation.
Answered 3/10/2019
5.5k views
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