4. Standardization of IOL The optimal length for an IOL is not well established and data on definitions of a failed IOL and prolonged latent phase are lacking. Multiple studies have shown that within 6 hours of oxytocin administration, 60-70% of patients are in active labor. Although data suggest that the longer latent labor is allowed to proceed, the more women that will deliver vaginally, there is also evidence of an increased risk of morbidity, without a large incremental gain. Certain dosing and regimens of individual agents have been evaluated to try and decrease labor; however, studies have not evaluated the use of time cut offs during an IOL to help reduce variation in practice and standardize the IOL process.