Ultra Pure 360 Keto However, within this limitation it is possible to describe those core areas of knowledge and competence that occupational health nurses use. The following list is not intended to be exhaustive, but rather to give an indication of the wide range of competencies that occupational health nurses demonstrate in practice. The OHA is skilled in primary prevention of injury or disease. The nurse may identify the need for, assess and plan interventions to, for example modify working environments, systems of work or change working practices in order to reduce the risk of hazardous exposure. Occupational health nurses are skilled in considering factors, such as human behavior and habits in relation to actual working practices.