Clinical Assessment
Performance Status
Also known as: ECOG status, PS, Karnofsky score, Functional status
Definition
Standardized measure of a patient's functional ability and daily activity level, used to determine treatment eligibility.
Detailed Explanation
ECOG scale: 0 (fully active), 1 (restricted strenuous activity), 2 (ambulatory, self-care, >50% awake), 3 (limited self-care, >50% in bed), 4 (completely disabled). Karnofsky scale uses 0-100%. Most clinical trials require PS 0-1 or 2. PS is a strong prognostic factor and influences treatment tolerance.