Comprehensive Pulmonary Function Testing (PFT)
Accurate, non-invasive respiratory evaluations designed to measure lung capacity, airflow, and gas exchange. Guided by evidence-based American Lung Association standards for optimal lung health.
Why Get Tested?
Early Detection
Identify airway narrowing and sub-clinical changes before severe symptoms appear.
Tailored Treatment
Guides physicians in prescribing precise medication or bronchodilator therapy.
Objective Tracking
Monitor condition progression for Asthma, COPD, and Pulmonary Fibrosis.
What is a Pulmonary Function Test?
Pulmonary Function Tests (PFTs) are a group of non-invasive breathing tests that evaluate how efficiently your lungs receive, hold, and exchange air. Rather than relying on a single measurement, PFTs provide a complete picture of your respiratory system's strength and functionality.
By comparing your results with predicted normative values (based on age, height, biological sex, and ethnicity), specialists can accurately diagnose restrictive or obstructive airway disorders.
- Evaluates unexplained shortness of breath or persistent cough
- Assesses surgical readiness prior to major thoracic operations
- Monitors lung health following environmental or occupational exposures
- Measures response to ongoing respiratory therapies
Common Symptoms Investigated
Your healthcare provider may recommend a PFT if you regularly experience any of the following symptoms:
Types of Pulmonary Function Tests
Depending on your individual symptoms, your physician may order one or a combination of the following specialized tests during your diagnostic visit.
Spirometry
Measures how much air you can inhale and how fast you can forcefully exhale. It is the primary tool used to diagnose obstructive conditions like Asthma and COPD.
Plethysmography
Also known as a Body Plethysmography or Lung Volume Test. Performed inside a clear, airtight booth to measure Total Lung Capacity (TLC) and Residual Volume (RV).
Diffusion Capacity (DLCO)
Evaluates how effectively oxygen transfers from your lung air sacs (alveoli) into your bloodstream using a harmless, minute trace of carbon monoxide.
6-Minute Walk Test
Assesses functional exercise capacity and oxygen saturation levels while walking at a normal pace to detect exertional desaturation.
Oxygen & Blood Gas
Real-time pulse oximetry or Arterial Blood Gas (ABG) tests measure oxygen levels and blood pH to evaluate metabolic and respiratory function.
FeNO Testing
Measures nitric oxide levels in your breath to detect allergic airway inflammation, providing specific diagnostic clues for asthma treatment response.
What to Expect During Your PFT
Pulmonary function tests are painless, non-invasive, and performed by certified respiratory therapists.
Preparation & Setup
You will sit upright in a comfortable chair. A soft nose clip will be placed on your nose to ensure all breathing occurs strictly through your mouth.
Mouthpiece Connection
You will seal your lips tightly around a clean, sterile, single-use mouthpiece connected to the diagnostic recording machine.
Guided Breathing Maneuvers
The technician will guide you to breathe in deeply, hold your breath briefly, or blow out as hard and fast as possible until your lungs feel completely empty.
Post-Bronchodilator Re-testing
If indicated, you may inhale an asthma reliever medication (bronchodilator) and repeat the test 15 minutes later to measure responsiveness.
How to Prepare for Your Test
Following these simple preparation steps ensures your diagnostic results are as accurate as possible.
Avoid Inhaled Medications
Your doctor will advise you if and when to temporarily withhold specific inhalers (e.g., short-acting bronchodilators) prior to testing.
Refrain From Smoking
Do not smoke, vape, or use tobacco products for at least 1 to 2 hours before the test to prevent transient airway restriction.
Eat Light Meals
Avoid heavy meals for 2 hours prior to your visit. A full stomach can restrict your diaphragm and prevent maximum inhalation.
Wear Loose Clothing
Wear comfortable, loose-fitting clothing that allows your chest and abdomen to expand fully without restriction.
Frequently Asked Questions
Find quick answers to common questions about Pulmonary Function Tests.
No, PFTs are non-invasive and completely painless. They simply involve breathing in and out through a tube. You may feel slightly tired or briefly lightheaded from blowing hard, but rest periods are provided throughout the test.
Depending on the specific combination of tests ordered by your physician (e.g., Spirometry + Lung Volumes + DLCO), the entire session usually takes between 30 to 60 minutes.
As recommended by the American Lung Association, your raw test measurements are compared against standard predicted values for healthy individuals of your age, biological sex, height, and ethnicity. A Z-score quantifies how far your results deviate from the predicted average.
PFTs are very safe. Because forceful exhalation increases pressure in your head, chest, and abdomen, patients who recently had heart attacks, eye surgery, or abdominal surgery should consult their doctor before testing.
Take Control of Your Respiratory Health
Speak with your physician or contact our clinical team to schedule your comprehensive Pulmonary Function Test today.