Trilaminar Endometrium

A trilaminar endometrium refers to an inner uterine lining that has a triple-line pattern as seen on an ultrasound examination. This type of endometrium is typically thick and receptive enough to aid in successful embryo implantation.

A trilaminar endometrial pattern correlates with higher clinical pregnancy rates in frozen embryo transfer (ET) cycles. In contrast, an endometrium that lacks the triple-line pattern interferes with the implantation of the embryo and thus negatively impacts pregnancy rates.