Ovarian Stimulation in Difficult IVF Cases

Poor ovarian responders (PORs) are the most challenging patients in assisted reproductive technology (ART) and account for 9 to 24 percent of in vitro fertilization (IVF) patients [1]. The difficulties to classify these patients are due to the lack of clear definition, 47 randomized controlled trials (RCTs) and 41 different definitions were reported [2].