1. What is Peak Flow Calculation?

Peak Flow Calculation estimates the maximum speed of expiration, which is an important measure of lung function and respiratory health. It helps in monitoring asthma and other respiratory conditions.

2. How Does the Calculator Work?

The calculator uses the Peak Flow formula:

Where:

• \( Height \) — Height in centimeters (cm)
• \( Age \) — Age in years
• \( Gender Factor \) — 1.0 for males, 0.9 for females

Explanation: The formula accounts for the relationship between height, age, gender and lung capacity, with height being the primary determinant of lung size.

3. Importance of Peak Flow Measurement

Details: Regular peak flow monitoring is crucial for asthma management, detecting early signs of worsening, and evaluating treatment effectiveness. It helps in creating asthma action plans.

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). The result represents predicted peak expiratory flow in liters per minute.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal peak flow reading?
A: Normal values vary by age, height, and gender. Generally, readings 80-100% of predicted are considered normal, while below 80% may indicate airway obstruction.

Q2: How often should peak flow be measured?
A: For asthma monitoring, it's typically measured twice daily - morning and evening. More frequent measurements may be needed during exacerbations.

Q3: What factors can affect peak flow readings?
A: Recent respiratory infections, smoking, exercise, medications, time of day, and proper technique can all influence readings.

Q4: When should I be concerned about my peak flow?
A: If readings drop below 80% of your personal best, show significant variability, or fall into the "red zone" of your asthma action plan.

Q5: Can this calculator be used for children?
A: This formula is primarily designed for adults. Pediatric peak flow calculations may require different formulas or growth charts.