Yes, because the placenta produces hCG after embryo implantation. With a blighted ovum, even though there is no embryo, the placental tissue can remain in the body for a brief time and continue releasing hCG. They will stop doubling and begin to drop eventually, though.
Can hCG levels go up with a blighted ovum?
By Andrea Rodrigo B.Sc., M.Sc. (embryologist).
Last Update: 10/20/2017
Bachelor's Degree in Biotechnology from the Polytechnic University of Valencia. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia along with the Valencian Infertility Institute (IVI). Postgraduate course in Medical Genetics.