The answer is yes. The implantation window usually occurs around days 20-24 of the menstrual cycle and is the time of greatest endometrial receptivity.
However, some women have a displaced window of implantation, that is, they have greater endometrial receptivity at a different time in the cycle.
One way of assessing uterine receptivity is to perform an ultrasound scan to measure the thickness of the endometrium. When it measures between 8-12 mm and has a trilaminar aspect, it is the perfect moment for implantation. If the endometrial thickness is less than 7 mm or more than 13 mm, the chances of implantation decrease.
There are endometrial receptivity tests that attempt to predict the state of the endometrium. The ERA (Endometrial Receptivity Array) test consists of performing an endometrial biopsy during the days that we think are the patient's window of implantation and analyzing the expression of genes involved in endometrial receptivity to determine whether the window of implantation is displaced or not, and thus calculate the best moment for embryo transfer in IVF treatment.
