What are the limitations of the ecog performance?

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

How does the ecog performance compare to other hematology scores?

The ecog 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 ecog performance free to use?

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

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Revised Zubrod / ECOG Performance

Functional Gatekeeping: Performance status is the most powerful predictor of response and survival in oncology. Grade 2 is the standard 'pivot' for treatment intensity.

Guidelines & Evidence

Clinical Details

Section 1

When to Use

Standardizing the assessment of a patient's functional status and daily living activities.

Determining eligibility for intensive chemotherapy or clinical trials.

Monitoring disease progression or response to therapy.

Terminology

Also known as the Zubrod Score or WHO Performance Status.

Section 2

Formula & Logic

Oken et al. Definitions

Grade	Description
0	Fully active, able to carry on all pre-disease performance without restriction.
1	Restricted in physically strenuous activity but ambulatory and able to carry out work of a light or sedentary nature (e.g., light house work, office work).
2	Ambulatory and capable of all selfcare but unable to carry out any work activities; up and about more than 50% of waking hours.
3	Capable of only limited selfcare; confined to bed or chair more than 50% of waking hours.
4	Completely disabled; cannot carry on any selfcare; totally confined to bed or chair.
5	Dead.

Section 3

Pearls/Pitfalls

The Treatment Pivot

Most aggressive chemotherapy protocols and clinical trials require an ECOG score of 0 or 1. Patients with ECOG 2 may be considered for dose-reduced therapy, while ECOG 3-4 often mandates supportive care only.

ECOG vs. Karnofsky

While Karnofsky (0-100) provides more granularity, ECOG (0-5) is the global standard for its simplicity and superior inter-observer agreement among clinicians.

Section 4

Evidence Appraisal

Primary Consensus

Toxicity and response criteria of the Eastern Cooperative Oncology Group.

Oken MM et al. • American Journal of Clinical Oncology. 1982;5(6):649-55.

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Section 5

Literature

History

Developed by the Eastern Cooperative Oncology Group (ECOG) to provide a shared language for trial reporting that correlates directly with prognosis.

Last Comprehensive Review: 2026

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