High incidence of diminished ovarian reserve in young unexplained recurrent pregnancy loss patients.

Recurrent pregnancy loss (RPL) is a clinically challenging scenario for patients and providers since an evidence-based approach to evaluation results in no explanation at least 50% of the time. The most common cause of first trimester clinical miscarriage is chromosome imbalance in the embryo or aneuploidy and the incidence of aneuploidy increases with age and diminished ovarian reserve (DOR). Currently, no professional societies recommend ovarian reserve testing in RPL patients, but some research shows a higher rate of DOR in miscarriage patients. The objective of this study was to evaluate the prevalence of DOR in unexplained vs. explained RPL patients. A prospective cohort study was completed, including 264 patients with recurrent pregnancy loss, 87 with an identifiable cause and 177 patients unexplained. A higher percentage of patients with unexplained RPL had DOR compared to patients with a known cause for RPL (48% vs 29%,  = .005). This finding was most significant in patients less than 38 years old compared to patients 38 years old and older (22% vs. 12%,  = .04). In conclusion, DOR is associated with RPL in many patients with otherwise unexplained RPL. Providers should consider adding ovarian reserve testing to their evaluation of RPL patients to guide counseling for treatment options.