COPD stages explained: the GOLD criteria in plain language

Your pulmonologist may reference a "GOLD stage." Here's what that grading system is actually measuring.

The Global Initiative for Chronic Obstructive Lung Disease (GOLD) grades COPD severity primarily using FEV1 — the volume of air you can forcefully exhale in one second, measured by spirometry and compared to a predicted normal for your age, height, and sex.

Grade 1 (mild) is FEV1 at 80% of predicted or above, often with few noticed symptoms. Grade 2 (moderate) runs 50–79%. Grade 3 (severe) is 30–49%. Grade 4 (very severe) is below 30%, or below 50% with chronic respiratory failure. The grade alone doesn't dictate treatment — it's combined with symptom scores and exacerbation history.

That combined assessment is why two people with an identical FEV1 can be on different treatment plans: one with frequent flare-ups and significant breathlessness is managed more aggressively than one with the same spirometry number but stable, mild symptoms. Exercise capacity is also part of that picture, which is what makes a structured pulmonary rehab program worth understanding regardless of your specific grade.

The number also isn't static in the short term — it can shift with an active infection or acute exacerbation, which is why staging is typically done when a patient is at a stable baseline, not during a flare.

This article is general health information, not medical advice, and doesn’t replace evaluation by your own physician. Talk to a doctor about anything specific to your own diagnosis or treatment.

Sources

GOLD — 2026 Global Strategy for Diagnosis, Management, and Prevention of COPD

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COPD stages explained: the GOLD criteria in plain language

Your pulmonologist may reference a "GOLD stage." Here's what that grading system is actually measuring.

This article is general health information, not medical advice, and doesn’t replace evaluation by your own physician. Talk to a doctor about anything specific to your own diagnosis or treatment.