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Pulmonary function test / spirometry

A Pulmonary function test / spirometry is a diagnostic procedure test of the lungs. It shows how much and how fast you can breathe out; reversibility after an inhaler. No ionising radiation when done without X-ray guidance.

General health information, not a diagnosis. In an emergency, call 102. Always consult a qualified health professional.

What it shows

How much and how fast you can breathe out; reversibility after an inhaler.

Why it is done

Asthma, COPD, breathlessness.

Preparation

Avoid smoking and heavy meals before; inhalers may be paused on advice.

Radiation & safety

No ionising radiation when done without X-ray guidance.

How long it takes

20 to 45 minutes. General information, not a diagnosis. Results must be interpreted by a qualified health worker.

Sample type

Diagnostic procedure

Consult a doctor to interpret results — a single test does not make a diagnosis.

Related conditions

entry-health-condition-asthma-entry-health-condition-copd

Where to get this near you

Care near you

Uses your location once to list the nearest facilities. Nothing is stored.

Common questions

What does a pft show?
How much and how fast you can breathe out; reversibility after an inhaler.

Why is a pft done?
Asthma, COPD, breathlessness.

How do I prepare for a pft?
Avoid smoking and heavy meals before; inhalers may be paused on advice.

Does a pft use radiation?
No ionising radiation when done without X-ray guidance.

How long does a pft take?
20 to 45 minutes

Why is Pulmonary function test / spirometry done?
Asthma, COPD, breathlessness.

How do I prepare for Pulmonary function test / spirometry?
Avoid smoking and heavy meals before; inhalers may be paused on advice.

Is Pulmonary function test / spirometry safe in pregnancy?
No ionising radiation when done without X-ray guidance.

SI text CC BY 4.0; RadiologyInfo.org (ACR/RSNA) and MedlinePlus linked as references only, no text copied.

Sources: SI health summary (own words); decoder imaging pack; RadiologyInfo.org and MedlinePlus as references only

Emergency — call102