The authors systematically reviewed the 32 articles fitting predetermined criteria that investigated health and social care professionals' knowledge, detection, and reporting of elder abuse. These included 21 surveys (of 5,325 professionals), nine analyses of elder abuse reports to statutory bodies, and two intervention studies. Compatible results were pooled in a meta-analysis. Professionals consistently underestimated the prevalence of elder abuse. Only a quarter of U.S. physicians were aware of American Medical Association elder abuse guidelines. The authors found that 33.7% (95% confidence interval: 27.5-40.1) of health care professionals had detected a case of older adult abuse in the last year. This was slightly higher when only studies judged to be most representative, which all surveyed physicians, were included (39.9% [23.4-57.7]). About half of the detected abuse cases were reported. Professionals who recalled receiving any training on abuse were no more likely to detect abuse than those who stated they had not had training, although they were more likely to report the abuse if they detected it. Interventions that taught professionals about the management of abuse by face-to-face training were effective in increasing knowledge, whereas giving written information was not. No intervention studies have investigated whether detection and reporting of abuse can also be increased through education. Current evidence would support the development and testing of interventions to increase professionals' detection and reporting of abuse. These would encourage them to ask older people about abuse, and address professionals' concerns about the impact of reporting on therapeutic relationships, victims; and legal consequences for the reporter.