Interpretations
All PUL prediction protocols are not diagnostic and may misclassify patients. They can guide clinicians to increase the follow-up frequency of high-risk patients, but should not be used to choose interventions. Unnecessary intervention may result in harm to an intrauterine pregnancy. In addition, the prediction accuracy of some protocols are unstable in different regions.7 Based on this, it is suggested that clinicians be cautious about the prediction results of any protocol, and comprehensively evaluate the patients in combination with clinical manifestations (such as abdominal pain or signs and symptoms of hemodynamic compromise).5