The Palliative Performance Scale (PPS) is a modification of the KPS and aims to help overcome the limitation of the KPS. In addition to the activities already measured in the KPS, the PPS assesses the patient characteristics of food/fluid intake and level of consciousness. PPS ratings directly correlated with short-term prognosis for terminally ill patients with or without cancer. It is generally accepted that a KPS or PPS score of 50 or less is predictive that the patient may have a prognosis of 6 months or less.
The PPS assessing ambulation, self care ability, intake, level of consciousness, activity level, and evidence of disease, is described as follows: