Objective To analyze the cases of medical disputes involving prenatal examination from a point of view of forensic expertise, and to discuss the risk of medical disputes and the preventive measures. Methods A retrospective analysis was conducted on 49 forensic expertise cases of medical disputes in prenatal examination which were identified in Academy of Forensic Science and Shanghai Di’an Forensic Science Limited Company from 2010 to 2017. Results In recent years, the number of medical disputes involving prenatal examination showed an increasing trend year by year. The common causes of medical disputes were: uninformed or insufficiently informed disclosure （20 cases）; the propaganda and application of three-dimensional, four-dimensional ultrasound were not standardized （14 cases）; ultrasound examination and serological screening process were not standardized （12 cases）; no antenatal counseling （2 cases）, etc. Conclusion In order to minimize the occurrence of such medical disputes, hospitals or related associations should avoid the risk of prenatal examination through the standardization of management and operation.