Uterine Natural Killer (uNK) Cell Expression in Patients With Repeated ICSI Failures: A Multicenter Cohort Study

On outpatient basis, we will take a uterine sample on mid-luteal phase day 21 by Novac curette or pipelle aspirator. Samples of endometrium will be kept in formaline solution and will be sent to National Institute of research and medical sceinces at Alexandria University to be tested for uNK Cells CD56.