Performance status (Karnofsky)

What it is

Performance status describes how well a person is able to carry out everyday activities and care for themselves. It is often measured by the Karnofsky Performance Status scale (a 0–100 scale, with higher numbers indicating better functioning). In gliomas, performance status is an important prognostic factor and influences treatment decisions.

Understanding Performance status (Karnofsky)

A person's overall functional condition — their ability to perform daily activities, work, and self-care — reflects how well they are doing and their reserve to tolerate treatment. The Karnofsky scale quantifies this, with higher scores indicating greater independence and ability. In gliomas, higher performance status is generally associated with better outcomes and is one of the recognized prognostic factors (alongside tumor features and age). It also informs treatment decisions: a person with good performance status may be a candidate for more intensive treatment, while for someone with poorer status, treatment may be tailored to balance benefit and burden, prioritizing quality of life. Performance status can change over the course of illness and is reassessed. Like other prognostic factors, it influences probabilities at the population level and is considered in personal context. Understanding performance status in gliomas clarifies how functional condition influences prognosis and treatment.

Why it matters

Understanding performance status helps patients and families see how a person's functional condition — their ability to carry out daily activities — influences both prognosis and treatment decisions, balancing benefit and quality of life.