This book brings together authoritative accounts by leaders in the field of reproductive biology, researchers who have closely investigated implantation. The subject is approached from several angles: biochemical, endocrinological, pharmacological, anatomic, and immunological.

The Organon Symposia have actually become a tradition, keeping up with exciting developments in reproductive medicine. The purpose of this symposium on "Fertiliza tion of the Human Egg in Vitro" was to bring together the stilllimited number of elinical specialists in the field and to stimulate another group of basic research people to exchange their experiences and knowledge, hopefully promoting elose cooperation between the two groups. It was a kind of scientific "first" that all research teams so far successful in achieving the birth of a healthy baby, fertilized in vitro came together at a workshop conference without a large audience of spectators and reporters, but with a small number of highly critical colleagues from the fields of basic reproductive physiology and comparative developmental biology. This atmosphere allowed for the elose exchange of results, hypotheses, diagnostic and therapeutic procedures, criticism, and respect, and created very productive discussions, all of which furthered the aim of the method: To help more childless couples to have their own babies by the ultima ratio procedure of in vitro fertilization and embryo replacement. The book that has emerged from this symposium will help to disseminate the great amount of information and experience gathered among the scientifically and clinically interested colleagues of many other hospitals and universities who could not be invited to the meeting. At the same time, it will prove that there is much more work to be done in the basic and clinical sciences of human embryology and reproductive biology.

The versatility of oocyte and embryo donation has proven to be extremely valuable to both patients and doctors engaged in reproductive medicine. Originally thought to be applicable only to a rather small subset of infertile women, today busy practices commonly recommend the procedure and it is estimated that nearly all of the 400 or more IVF programs in the United States provide these services. Oocyte and embryo donation has established itself as a mainstay procedure within assisted reproductive care, and the breadth, depth and complexity of practice is deserving of focused attention. Much has changed within the field of oocyte and embryo donation since the publication of the first edition of Principles of Oocyte and Embryo Donation in 1998, thus the need for a completely updated and more expansive text. The second edition of this book provides an overview of the major issues affecting men and women engaged in the practice of oocyte and embryo donation. A primary emphasis has been placed on defining the standards of practice that have evolved over the past 30 years, clearly stating the outcomes expected from adhering to these established protocols. Details of both the basic science and the clinical medicine are presented together and attention is also focused on the non-reproductive aspects inherent to this unique method of assisted reproduction that involves opinions from lawyers, ethicists, mental health care professionals and theologians. Oocyte and embryo donation requires a working knowledge of the medicine, the law and the ethics that underlies its foundation. This book is intended to serve as a complete and comprehensive reference for all health care professionals that provide services related to egg donation, reproductive endocrinologists, obstetrician- gynecologists, and fellows and residents entering the fertility field.