The U.S. research group of Richard Scott Jr. has published a well-designed randomised controlled study that looked at the potential benefit of a small intra-uterine infusion of the pregnancy hormone, hCG.

The idea behind this study was that the embryo secretes hCG to tell the endometrium to become more receptive. The researchers hoped that by infusing extra hCG in the uterine cavity they could make the endometrial lining even more receptive.

A logical and promising idea but ...