The most recent protocol is that of ONE INJECTION, as it is called. It is essentially chorifolitropin α (ELONVA) which is given once on the second day of the cycle and essentially replaces the seven-day injections! From the 6th day it is combined with an antagonist and from the 8th day, if the stimulation is not completed, a daily extra dose of gonadotropins is added. This is an even more simplified antagonist protocol with similar efficacy and perhaps a slightly higher rate of ovarian hyperstimulation syndrome.
