Strengths and Limitations
For the first time, we evaluated the acceptability of protocols for predicting the outcome of ectopic pregnancy in patients with PUL, which has implications for the application of these protocols to practical clinical work. We evaluated for the first time the accuracy of the M6 model in predicting ectopic pregnancy. However, the studies were inconsistent in terms of the definition of EP, the definition of PUL and how to present the results of data analysis, and the threshold of protocols were not identical, which rmay esulted in heterogeneity between studies.