1. What is the PFT Score?

The PFT (Pulmonary Function Test) Score is a measure of lung function that calculates the ratio of Forced Expiratory Volume in 1 second (FEV1) to Forced Vital Capacity (FVC), expressed as a percentage. It helps assess the presence and severity of obstructive lung diseases.

2. How Does the Calculator Work?

The calculator uses the PFT Score formula:

Where:

• \( FEV1 \) — Forced Expiratory Volume in 1 second (Liters)
• \( FVC \) — Forced Vital Capacity (Liters)

Explanation: The formula calculates the percentage of the total lung capacity that can be exhaled in the first second of a forced exhalation.

3. Importance of PFT Score Calculation

Details: The PFT Score is crucial for diagnosing obstructive lung diseases like asthma and COPD, monitoring disease progression, and evaluating treatment effectiveness.

4. Using the Calculator

Tips: Enter FEV1 and FVC values in liters. Both values must be valid (greater than 0). The result is expressed as a percentage.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal PFT Score range?
A: A normal PFT Score is typically above 70-80%. Values below 70% may indicate obstructive lung disease.

Q2: What's the difference between FEV1 and FVC?
A: FEV1 measures the volume of air exhaled in the first second, while FVC measures the total volume of air exhaled during the test.

Q3: When should PFT testing be performed?
A: PFT testing is recommended for patients with respiratory symptoms, smokers, occupational exposure risks, and for preoperative assessment.

Q4: Are there limitations to PFT Score?
A: The score may be affected by patient effort, technique, and certain medical conditions. It should be interpreted in clinical context.

Q5: How often should PFT be repeated?
A: Frequency depends on the clinical situation - annually for stable COPD, more frequently during exacerbations or treatment changes.