Our embryologist, Shari Olsen, Ph.D., has extensive experience conducting this delicate procedure and is highly proficient. The fertilization rate using ICSI is high, typically exceeding 60%.
Using ICSI, it is also possible for men with no sperm in their ejaculate to father a pregnancy. The urologist can withdraw sperm directly from the male reproductive tract using testicular sperm aspiration (TESA) or microscopic epididymal sperm aspiration (MESA). TESA involves extracting sperm from the testicles and using MESA the sperm are withdrawn from the epididymis, which is collection of small tubules within the scrotum.
Such circumstances are typically needed when the tubes leading from the testicle are obstructed, such as in cases involving trauma or a vasectomy, which cannot be reversed.