1. What is Peak Expiratory Flow?

Peak Expiratory Flow (PEF) is the maximum speed of expiration during forced breathing. It is commonly used to monitor and manage asthma and other respiratory conditions.

2. How Does the Calculator Work?

The calculator uses the PEF prediction equation:

Where:

• \( Height \) — Height in centimeters
• \( Age \) — Age in years
• 5.48, 0.041, 4.47 — Coefficients for male population

Explanation: This equation predicts normal PEF values based on height and age for male individuals.

3. Importance of PEF Measurement

Details: PEF monitoring helps in asthma management, detecting early signs of worsening, and evaluating treatment effectiveness.

4. Using the Calculator

Tips: Enter height in centimeters, age in years, and select gender. All values must be valid (height > 0, age between 1-120).

5. Frequently Asked Questions (FAQ)

Q1: What is a normal PEF value?
A: Normal PEF values vary by age, height, and gender. Typically ranges from 400-600 L/min for adults.

Q2: How often should PEF be measured?
A: For asthma monitoring, twice daily (morning and evening) is recommended to establish personal best and monitor variability.

Q3: What affects PEF readings?
A: Respiratory conditions, effort during testing, time of day, and recent bronchodilator use can affect readings.

Q4: What is the female PEF equation?
A: Different equations exist for females, typically using similar variables but with different coefficients.

Q5: When should I be concerned about my PEF?
A: If PEF drops below 80% of your personal best or shows significant day-to-day variability, consult your healthcare provider.