Monitoring COS and HRT cycles

Abstract

The aim of monitoring the COS during an IVF/ICSI cycle is the retrieval of an adequate number of oocytes and timing the triggering for final oocyte maturation. Ultrasound scanning of the number and size of follicles is the main monitoring method, while measurement of serum estradiol levels together with ultrasonography does not seem to add any benefits. In HRT cycles, the endometrium is prepared for frozen-thawed embryo transfer with the administration of estradiol and progesterone. During the administration of estradiol, the endometrial thickness is assessed by transvaginal ultrasound. This measurement determines the onset of progesterone treatment and finally the time of frozen-thawed embryo transfer. © 2018 Elsevier Inc.