COPD spirometry explained: a pattern, a measurement and a clinical context

Start with the reason you are measuring

A ratio is easier to recall when it answers a question you understand. In this topic, the question is whether there is persistent airflow obstruction in a person with a compatible clinical picture.

NICE recommends post-bronchodilator spirometry to confirm COPD. GOLD identifies a post-bronchodilator FEV₁/FVC below 0.7 as the spirometric criterion required for diagnosis. The history and clinical context remain important. [1] [2]

Say what each part contributes before trying to memorise a treatment pathway. This guide focuses on understanding the diagnostic link, not on providing a complete COPD management plan.

Do not let the threshold replace the patient

NICE advises considering alternative diagnoses or investigations in older people with a ratio below 0.7 but no typical COPD symptoms, and in younger people with symptoms despite a ratio of 0.7 or above. [1]

For learning, contrast two prompts: “What is the spirometric criterion?” and “Is this enough information to diagnose this particular person?” They test related but different reasoning tasks.

Inspect the original visual, then test yourself

The respiratory gallery contains the original COPD WebP supplied with this website build. The viewer preserves its aspect ratio and lets you inspect the available source detail. It does not replace the original with a blurred thumbnail or stretch it to fill the frame.

Zooming a raster image cannot add detail that is absent from the source. The preview therefore shows its native dimensions, 1672 × 941 pixels, rather than calling it a new 4K image.

After viewing, close the visual and explain why post-bronchodilator testing and clinical context belong together. Reopen it only to check the part you could not reconstruct. Clinical material within the supplied slide is unchanged; verify treatment details against current guidance rather than relying on a marketing preview.