Follicular and estradiol parameters that improve success with natural cycle in vitro fertilization.

Objective: To describe clinical thresholds for follicle size and estradiol levels to optimize success with natural cycle in vitro fertilization (NCIVF).

Study Design: Descriptive cohort of candidates for stimulated IVF, < 43 years old, with regular menstrual cycles, regardless of ovarian reserve or fertility treatment history. Patients underwent NCIVF, defined as oocyte retrieval, fertilization and embryo transfer after human chorionic gonadotropin (hCG) trigger without luteinizing hormone (LH) suppression or ovarian stimulation medications.

Utilization and success rates of unstimulated in vitro fertilization in the United States: an analysis of the Society for Assisted Reproductive Technology database.

Objective: To examine the utilization and outcomes of natural cycle (unstimulated) IVF as reported to the Society of Assisted Reproductive Technology (SART) in 2006 and 2007.

Design: Retrospective analysis.

Setting: Dataset analysis from the SART Clinical Outcome Reporting System national database.