The transfer of frozen embryos or deferred transfer can be carried out in two ways, the main difference being the way in which endometrial growth is promoted:
- Natural cycle
- the timing of the menstrual cycle is controlled, as own estrogens and progesterone are used.
- substituted cycle
- inhibits the secretion of endogenous hormones and hormonal drugs are administered for greater control, in particular estrogen patches and progesterone eggs.
By Edurne Martínez Sanz BSc, MSc (senior clinical embryologist), Gorka Barrenetxea Ziarrusta MD, PhD (gynecologist), Dr. Juan José Espinós Gómez (gynecologist), María Eugenia Ballesteros Moffa MD, MSc, BSc (gynecologist), Rebeca Reus BSc, MSc (embryologist) and Romina Packan (invitra staff).
Last Update: 06/01/2020