OASIS is a group of data items developed, tested, and refined over the past decade. The OASIS items were designed for the purpose of enabling the rigorous and systematic measurement of patient home health care outcomes, with appropriate adjustment for patient risk factors affecting those outcomes. Outcomes have been defined in many ways, but those derived from OASIS items have a very specific definition: they measure changes in a patient’s health status between two or more time points.
The OASIS was designed to provide the necessary data items to measure both outcomes and patient risk factors. The OASIS is thus key to outcome measurement and performance improvement using outcomes. OASIS data items address sociodemographic, environmental, support system, health status, functional status, and health service utilization characteristics of the patient. The data are collected at start of care, 60-day follow-ups, and discharge (and surrounding an inpatient facility stay).
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