What Is a Pulmonary Function Test?
A pulmonary function test (PFT) is a non-invasive breathing test that measures how well your lungs are working, including airflow, lung volume, and gas exchange.
Spirometry is the most common PFT and the gold standard for diagnosing conditions like COPD, asthma, and restrictive lung disease. It measures:
FEV1
Air exhaled in the first second
FVC
Total air exhaled
FEV1/FVC ratio
Helps identify obstruction
All testing is performed in-office, with results reviewed the same day by a pulmonologist.
When Is a Pulmonary Function Test Recommended?
A PFT may be recommended if you have:
- Breathlessness, chronic cough, or smoking history (COPD evaluation)
- Suspected or known asthma requiring monitoring
- Pre-operative evaluation for cardiac or thoracic procedures
- Unexplained breathing symptoms
- Occupational exposure to dust or chemicals
- Need for baseline lung function or treatment monitoring
What to Expect During Your Pulmonary Function Test
Before the Test
- Avoid short-acting inhalers for 4–6 hours (if advised)
- No smoking for at least 4 hours
- Wear comfortable, loose clothing
During the Test
- You will breathe into a mouthpiece with a nose clip
- Forced breathing maneuvers are repeated for accuracy
- Bronchodilator testing may be performed if needed
After the Test
- Results are reviewed
- The diagnosis and treatment plan will be discussed
Understanding Your PFT Results
Your pulmonologist will explain your results clearly. Key values include:
- FEV1: Below 80% may indicate airflow limitation
- FVC: Below 80% may suggest reduced lung capacity
- FEV1/FVC Ratio: Below 0.70 confirms obstruction (common in COPD)
A normal ratio with reduced lung volumes may indicate restrictive lung disease. These results help guide accurate diagnosis and treatment.
Why Choose SD Premier Clinics for Pulmonary Function Testing?
We provide accurate, efficient lung testing with immediate clinical insight:
Same-Day Results
Reviewed directly by your pulmonologist during your visit
No Lab Referral
In-office testing eliminates extra appointments and delays
Comprehensive Care
Diagnosis and treatment planning in the same visit
Evidence-Based Testing
Accurate spirometry for COPD, asthma, and lung conditions
Personalized Approach
Results interpreted in the context of your symptoms and history
Convenient Location
Easy access with free parking in South San Diego
Breathe Better with Accurate Lung Testing
Get clear answers about your lung health and start the right treatment without delays.
FAQs
Most tests take 15–60 minutes; plan for up to 90 minutes total.
Short-acting inhalers may need to be paused; follow your provider's instructions.
No, it's completely painless but requires effort during breathing maneuvers.
COPD, asthma, pulmonary fibrosis, and other lung conditions.
Yes, when medically necessary; most major insurance plans also provide coverage.