1. What is Expected Peak Flow?

Expected Peak Flow is the predicted maximum expiratory flow rate based on an individual's height and age. It's used to assess lung function and monitor respiratory conditions like asthma.

2. How Does the Calculator Work?

The calculator uses the expected peak flow equation:

Where:

• \( Height \) — Height in centimeters (cm)
• \( Age\ factor \) — Age-dependent adjustment factor
• 5.48 — Height coefficient multiplier

Explanation: The equation accounts for the relationship between height, age, and expected lung capacity, with age factors adjusting for natural decline in lung function.

3. Importance of Peak Flow Measurement

Details: Peak flow measurement is crucial for monitoring asthma severity, assessing treatment effectiveness, and detecting early signs of respiratory deterioration.

4. Using the Calculator

Tips: Enter height in centimeters and age in years. Ensure accurate height measurement for reliable results. The calculator is designed for adults aged 15 years and older.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal peak flow reading?
A: Normal values vary by height, age, and gender. Generally, 80-100% of predicted value is considered normal, while below 50% indicates severe airflow limitation.

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

Q3: What factors can affect peak flow readings?
A: Technique, time of day, recent bronchodilator use, respiratory infections, and environmental factors can all influence readings.

Q4: Is this calculator suitable for children?
A: This calculator is designed for individuals aged 15 years and older. Different equations are used for pediatric populations.

Q5: What should I do if my measured peak flow is significantly lower than expected?
A: Consult a healthcare provider, as this may indicate worsening asthma or other respiratory conditions requiring medical attention.