The Karnofsky index is a scale used to assess the general health and independence of a person living with a serious illness, especially cancer. It is scored in percentages from 100 to 0 and shows how much a person is limited in daily life and how much support they need.
What does the Karnofsky index measure?
The Karnofsky index captures, in simple steps, how well a person can still manage everyday activities. A score of 100 per cent means there are no symptoms at all and all daily tasks can be carried out without any help. As the score falls, increasing limitations appear. At 70 per cent, for example, the person can still live largely independently but needs occasional support. Scores below 50 per cent suggest that self-care is severely limited and that intensive support or nursing care becomes necessary. At 0 per cent, no life functions remain.
When is the Karnofsky index used?
The Karnofsky index plays an important role above all in oncology, which is the treatment of cancer. Doctors use it to quickly assess how much a person can cope with. This helps when deciding which treatments are still suitable, for example whether chemotherapy or surgery is appropriate and reasonable. The index can also be recorded several times during the course of an illness to document changes. It therefore appears frequently in medical letters, discharge reports, or applications for care services.
What do the individual scores mean?
The scale runs in steps of ten from 100 per cent (fully healthy) to 0 per cent (deceased). Scores between 100 and 80 per cent mean that everyday activities are possible without significant limitations. At 70 to 50 per cent, there is already a clear need for help, for example with dressing, eating, or personal care. Scores of 40 per cent and below indicate severe care needs, and around-the-clock support is often required.
Some examples:
100 per cent – no symptoms, unrestricted activity
70 per cent – can still manage self-care but is no longer able to carry out normal activities
40 per cent – needs a lot of help in daily life, spends most of the time in bed
10 per cent – seriously ill, dependent on constant care
Why is the Karnofsky index medically important?
The score gives a quick overview of a person's general condition. This is crucial when planning treatments or care. Someone with a high Karnofsky index can often still take an active part in decisions and receive various treatments. As the score falls, it is carefully considered whether demanding therapies are still appropriate or whether a palliative approach, meaning one focused on relief and comfort, would be a better fit. The index is also helpful for assessing care needs, applying for aids and equipment, or organising support in the home.
What does a low Karnofsky index mean for further treatment?
A low score shows that the illness has already progressed significantly or that severe symptoms are present. This can be unsettling, especially when a number in a medical letter has suddenly dropped noticeably. However, it does not automatically mean that no help is possible. Rather, the care team will then look very carefully at how quality of life can be maintained or improved. Relieving symptoms, pain management, and practical daily support often come to the fore. Care is adjusted, and social and medical support services can also be arranged.
How is the Karnofsky index determined?
The assessment is usually made through conversation and observation. Doctors or nursing staff ask how well everyday tasks are still being managed, whether symptoms are present, and how much support is needed. The score can sometimes vary over time, for example if health improves or declines as a result of treatment. The assessment is always a snapshot and should be reviewed regularly.
Where else does the term appear?
Beyond oncology, the Karnofsky index is also used in other areas, for example in palliative medicine, with chronic illnesses, or as part of care assessments. In all these settings, it serves as a guide for treatment decisions and planning next steps.
The Karnofsky index therefore provides a clear, easy-to-understand overview of a person's health and independence, and helps to find the right support and treatment.
