Knowledge of electronic fetal heart rate monitoring is crucial to OB nurses. In fact, studies have shown that a lack of understanding around electronic fetal monitoring (EFM) is one of the leading cause of lawsuits. That's what makes our recently published Electronic Fetal Heart Rate Monitoring: The 5-Tier System, Third Edition by Julian T. Parer, Tekoa L. King, and Tomoaki Ikeda so timely and relevant.