الفهرس 
CRYO-THAWED EMBRYO TRANSFER NATURAL VERSUS ARTIFACIAL CYCLE: RANDOMIZED CONTROLED TRIAL
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Abstract
In natural cycle FET (NC-FET) planning of embryo thawing and transfer requires the identification of a period of optimal receptivity (Duc-Goiran et al., 1999). This putative {u2018}window of implantation{u2019} starts shortly after ovulation. If an embryo is transferred within this window, the chances of conceiving are greater (Harper., 1992) . Planning NC-FET can either be done based on recognition of the LH surge that precedes ovulation (using serum or urine LH monitoring) or by triggering ovulation (sometimes referred to as modified NC-FET). Using modified NC-FET, the development of the dominant follicle is closely monitored by regular ultrasonic evaluation. On reaching a diameter of 16-20 mm human chorionic gonadotrophin (hCG) is administered and ovulation takes place approximately 36 h later. Embryo thawing and transferring can be planned accordingly