Rationale, Indications and Management of GnRH Analogues an Ovulation Induction Protocols

The ovulatory cycle is governed and accompanied by characteristic protein and steroid hormonal levels that are reflected by typical changes in the reproductive organs. To enable grouping, super-imposition, recording and comparison of various parameters of the ovulatory cycle, to define and characterize abnormalities and to plan rational therapeutic approaches, its span is divided into several phases. Each phase reflects a characteristic, easily definable hormonal or organic change. Depending on the criteria on which the division is based, several different phases of the ovulatory cycle may be recognized. In the following discussion the simple division into follicular, ovulatory and luteal phases will be used.