In vitro fertilization and embryo transfer during natural cycles

OBJECTIVE: To report the results of in vitro fertilization and embryo trans fer (IVF/ET) performed during natural cycles. STUDY DESIGN: A prospective clinical study. RESULTS: Thirty-two cycles were started in 19 patients who had regular ovul atory cycles and tubal factors or unexplained infertility only as the cause of infertility. Egg collection was performed in 12 cycles, and four pregna ncies resulted from ET in eight cycles. The pregnancy rates were 12.5% per cycle initiated, 33.3% per retrieval cycle and 50% per transfer. CONCLUSION: Natural cycle IVF/ET offers a low-cost alternative to patients with infertility.