What is spirometry and bronchodilator reversibility? 

Spirometry is the most common respiratory test, which involves forcefully expelling air from your lungs to measure the maximum speed and volume. Reversibility testing is commonly used to diagnose conditions such as asthma and COPD (chronic obstructive pulmonary disease). 

 

Explanation  

Measures the volume and speed of air inhaled and exhaled to check for airway narrowing (e.g., asthma or COPD). 

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How it is performed: 

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1. You take a maximum, full breath in until your lungs are completely expanded. 

2. You seal your lips tightly around the mouthpiece and blast the air out as hard and fast as possible, continuing to blow out steadily until your lungs feel completely empty (at least 6 seconds). 

3. You immediately take a fast, deep breath back in to complete the manoeuver.

 

Bronchodilator phase: If reversibility is tested, you will inhale a bronchodilator medication (such as salbutamol) via an inhaler and spacer, wait 10 minutes, and repeat the spirometry manoeuver to see if your airflow improves.