Pulmonary Function Test (PFT): Procedure, Normal Values & Precautions

Pulmonary Function Test (PFT) plays an important role in evaluating lung health. Understanding the procedure and interpretation helps patients feel confident before the test.

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How is PFT Performed? (Procedure)

1. Patient sits comfortably

2. Nose clip is applied

3. Patient breathes through a mouthpiece

4. Deep inhalation followed by forceful exhalation

5. Test may be repeated for accurate results

👉 Patient cooperation is very important for correct readings.

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Normal PFT Values (General Reference)

Parameter	Normal Value
FEV1	≥ 80% predicted
FVC	≥ 80% predicted
FEV1/FVC	≥ 70%
DLCO	≥ 75%

⚠️ Normal values depend on age, height, gender, and ethnicity.

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Diseases Detected by PFT

• Asthma

• COPD

• Chronic bronchitis

• Emphysema

• Pulmonary fibrosis

• Occupational lung diseases

• Neuromuscular disorders

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Preparation Before PFT

• Avoid smoking 4–6 hours before test

• Avoid heavy meals

• Wear loose clothes

• Stop inhalers only if doctor advises

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Is Pulmonary Function Test Safe?

Yes, PFT is completely safe.
Some patients may experience:

• Mild dizziness

• Temporary shortness of breath

These symptoms usually resolve quickly.

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Role of PFT with Radiology

PFT works together with:

• Chest X-ray

• CT Scan

• HRCT Chest

This combination helps in accurate diagnosis of lung diseases.

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Conclusion

Pulmonary Function Test is a simple yet powerful investigation for lung health. Early detection through PFT can improve treatment outcomes and quality of life.