What are the limitations of the karnofsky performance?

While the karnofsky performance is highly validated, it should not replace clinical judgment. OpiCalc provides the latest evidence-based limitations for the karnofsky performance to ensure safe bedside use and optimal diagnostic accuracy.

How does the karnofsky performance compare to other Hematology scores?

The karnofsky performance is a gold-standard diagnostic tool. OpiCalc provides side-by-side clinical guidance to help clinicians choose the most specific evidence-based tool for their patient's presentation.

Is the karnofsky performance free to use?

Yes. OpiCalc provides the karnofsky performance completely ad-free and optimized for mobile bedside use, ensuring you can calculate medical risk swiftly and without distraction.

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Karnofsky Performance Scale

Functional Granularity: KPS describes performance as a percentage of "Normal." Thresholds at 70% (Independence) and 50% (Assisted living) are clinically significant.

Guidelines & Evidence

Clinical Details

Section 1

When to Use

Evaluating the functional status of patients with cancer, particularly in bone marrow transplant (BMT) and palliative care settings.

Defining prognosis; lower KPS is associated with decreased survival and higher treatment toxicity.

Assessing eligibility for high-intensity chemotherapy or clinical trials.

Precision

Karnofsky provides more granular assessment (0-100%) compared to the 0-5 ECOG scale, making it preferred in complex inpatient settings like Stem Cell Transplant units.

Section 2

Formula & Logic

Threshold Definitions

Score	Level	Description
100	Normal	No complaints; no evidence of disease.
90	Normal	Able to carry on normal activity; minor signs or symptoms.
80	Normal	Normal activity with effort; some signs or symptoms.
70	Independent	Cares for self; unable to carry on normal activity or do active work.
60	Assisted	Requires occasional assistance but able to care for most needs.
50	Assisted	Requires considerable assistance and frequent medical care.
40	Disabled	Disabled; requires special care and assistance.
30	Severely Disabled	Severely disabled; hospital admission indicated although death not imminent.
20	Moribund	Very sick; hospital admission necessary; active supportive treatment.
10	Moribund	Moribund; fatal processes progressing rapidly.
0	Dead	Dead.

Section 3

Pearls/Pitfalls

BMT Gatekeeping

A KPS < 70% is often a contraindication for myeloablative conditioning or allogeneic stem cell transplantation due to the high risk of non-relapse mortality (NRM).

KPS vs. ECOG Mapper

Roughly: ECOG 0 ≈ KPS 100-90. ECOG 1 ≈ KPS 80-70. ECOG 2 ≈ KPS 60-50. ECOG 3 ≈ KPS 40-30. ECOG 4 ≈ KPS 20-10.

Section 4

Evidence Appraisal

Primary Strategy

The Clinical Evaluation of Chemotherapeutic Agents in Cancer. In: MacLeod CM, Ed. Evaluation of Chemotherapeutic Agents.

Karnofsky DA et al. • Columbia University Press. 1949;Original derivation of the 100-point scale.

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Section 5

Literature

Historical Context

Developed at Memorial Sloan Kettering (MSKCC) to provide an objective score for measuring the palliative effect of chemotherapeutic drugs.

Last Comprehensive Review: 2026

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