A never event is the "kind of mistake (medical error) that should never happen" in the field of medical treatment. According to the Leapfrog Group never events are defined as "adverse events that are serious, largely preventable, and of concern to both the public and health care providers for the purpose of public accountability." A 2012 study reported there may be as many as 1,500 instances of one never event, the retained foreign object, per year in the United States. The same study suggests an estimated total number of surgical mistakes at just over 4,000 per year in the United States; however, these statistics are extrapolations from small samples rather than actual event counts. United States A list of events was compiled by the National Quality Forum and updated in 2012. The NQF’s report recommends a national state-based event reporting system to improve the quality of patient care. Artificial insemination with the wrong donor sperm or donor egg Unintended retention of a foreign body in a patient after surgery or other procedure Patient death or serious disability associated with patient elopement (disappearance) Patient death or serious disability associated with a medication error (e.g., errors involving the wrong drug, dose, patient, time, rate, preparation or route of administration) Patient death or serious disability associated with a hemolytic reaction due to the administration of ABO/HLA-incompatible blood or blood products Patient death or serious disability associated with an electric shock or elective cardioversion while being cared for in a healthcare facility Patient death or serious disability associated with a fall while being cared for in a healthcare facility Surgery performed on the wrong body part Surgery performed on the wrong patient Wrong surgical procedure performed on a patient Intraoperative or immediately postoperative death in an ASA Class I patient Patient death or serious disability associated with the use of contaminated drugs, devices, or biologics provided by the healthcare facility Patient death or serious disability associated with the use or function of a device in patient care, in which the device is used or functions other than as intended Patient death or serious disability associated with intravascular air embolism that occurs while being cared for in a healthcare facility Infant discharged to the wrong person Patient suicide, or attempted suicide resulting in serious disability, while being cared for in a healthcare facility Maternal death or serious disability associated with labor or delivery in a