What is the Karnofsky Performance Scale?
The Karnofsky Performance Scale (KPS), also known as the Karnofsky Performance Status Scale, is a tool developed in the 1940s by the oncologist David Karnofsky as a way to assess the impacts of cancer on the functional status and the patient's ability to complete daily activities. Since then, it has been used for anyone afflicted with medical conditions that may affect their capabilities and quality of life.
The scale operates by observing a patient's physical ability to complete certain tasks or activities, like light housework or office work, and using the rating key to assign scores to each activity. Practitioners then calculate the scores to form a total performance status score that reflects the patient's ability. The score may also be used as a way to determine how a patient's symptoms are impacting their quality of life and identify whether the patient requires further institutional or hospital care to support them.
For patients experiencing more detrimental outcomes due to their health, this instrument may provide information regarding the patient's life expectancy and prompt palliative care plans or end-of-life care plans that suit their personal needs. Implementing this instrument in palliative settings allows patients to maintain their independence for longer and provides them more time to make calculated decisions before functional impairment progresses.
This instrument is a widely used tool that assists healthcare practitioners in forming care plans, as well as a monitoring tool to see what aspects of the plan need adjustment. Beyond its clinical applications, the Karnofsky Performance Scale is particularly valuable in cancer research and clinical trials. It is widely used to assess cancer patients' functional status, determine eligibility for studies, and measure treatment outcomes. The scale's simplicity and effectiveness make it a standard tool in medical oncology and related fields.










