Elective Single Embryo Transfer Following In Vitro Fertilization

Abstract Objective To review the effect of elective single embryo transfer (eSET) compared with double embryo transfer (DET) following in vitro fertilization (IVF), and to provide guidelines on the use of eSET in order to optimize live birth rates and minimize twin pregnancies. Options Rates of live birth, clinical pregnancy, and multiple pregnancy following eSET and DET are compared. Outcomes Live birth, clinical pregnancy, and multiple pregnancy rates, and cost-effectiveness. Evidence Published literature was retrieved through searches of PubMed, Medline, and The Cochrane Library in 2009, using appropriate controlled vocabulary (e.g., elective single embryo transfer) and key words (e.g., embryo transfer, in vitro fertilization, intracytoplasmic sperm injection, assisted reproductive technologies, blastocyst, and multiple pregnancy). Results were restricted to English language systematic reviews, randomized controlled trials/controlled clinical trials, and observational studies. There were no date restrictions. Searches were updated on a regular basis and incorporated in the guideline to November 2009. Additional references were identified through searches of bibliographies of identified articles and international medical specialty societies. Grey (unpublished) literature was identified through searching the websites of health technology assessment and health technology assessment-related agencies, clinical practice guideline collections, clinical trial registries, and national and international medical specialty societies. Values Available evidence was reviewed by the Joint Society of Obstetricians and Gynaecologist of Canada–Canadian Fertility and Andrology Society Clinical Practice Guidelines Committee and the Reproductive Endocrinology and Infertility Committee of the Society of Obstetricians and Gynaecologists of Canada, and was qualified using the evaluation of evidence criteria outlined in the report of the Canadian Task Force on Preventive Health Care. Benefits, Harms, and Costs This guideline is intended to minimize the occurrence of twin gestations while maintaining acceptable overall live birth rates following IVF-ET. Summary Statements 1. Indiscriminate application of eSET in populations with less than optimal prognosis for live birth will result in a significant reduction in effectiveness compared with DET. (I) 2. In women aged 38 years and over, eSET may result in a significant reduction in live birth rate compared with DET. (II-2) 3. Select