Lab

# Peak Expiratory Flow Rate

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Peak Expiratory Flow Rate, Peak Expiratory Flow, Peak Flow, PEFR

• Calculation
• Estimated PEFR in Children
1. PEFR = (Ht - 100) x5 + 100
2. Where
1. Ht is standing height in centimeters
2. PEFR is Peak Expiratory Flow in liters per minute
3. References
1. Balasubramanian (2002) Indian Pediatr 39:104-6 [PubMed]
• Calculation
• Estimated PEFR in Adult Females
1. PEFR = (((Height x3.72) +2.24) - (Age x 0.03)) x 60
2. Where Height in meters or (inches x 0.0254)
• Calculation
• Estimated PEFR in Adult Males
1. PEFR = (((Height x5.48) +1.58) - (Age x 0.041)) x 60
2. Where Height in meters or (inches x 0.0254)9
• Calculation
• Estimated Peak Flow in children based on height
1. Height 43 inches: 147 L/m
2. Height 44 inches: 160 L/m
3. Height 45 inches: 173 L/m
4. Height 46 inches: 187 L/m
5. Height 47 inches: 200 L/m
6. Height 48 inches: 214 L/m
7. Height 49 inches: 227 L/m
8. Height 50 inches: 240 L/m
9. Height 51 inches: 254 L/m
10. Height 52 inches: 267 L/m
11. Height 53 inches: 280 L/m
12. Height 54 inches: 293 L/m
13. Height 55 inches: 307 L/m
14. Height 56 inches: 320 L/m
15. Height 57 inches: 334 L/m
16. Height 58 inches: 347 L/m
17. Height 59 inches: 360 L/m
18. Height 60 inches: 373 L/m
19. Height 61 inches: 387 L/m
20. Height 62 inches: 400 L/m
21. Height 63 inches: 413 L/m
22. Height 64 inches: 427 L/m
23. Height 65 inches: 440 L/m
24. Height 66 inches: 454 L/m
25. Height 67 inches: 467 L/m
26. References
1. Polgar (1971) PFTs in Children, Saunders
• Calculation
• Estimated Peak Flow in Men based on Age and height
1. Height 65 inches (165 cm)
1. Age 25 years: 520 L/m
2. Age 30 years: 510 L/m
3. Age 40 years: 489 L/m
4. Age 50 years: 468 L/m
5. Age 60 years: 447 L/m
2. Height 70 inches (178 cm)
1. Age 25 years: 592 L/m
2. Age 30 years: 581 L/m
3. Age 40 years: 561 L/m
4. Age 50 years: 543 L/m
5. Age 60 years: 519 L/m
3. Height 75 inches (190 cm)
1. Age 25 years: 664 L/m
2. Age 30 years: 653 L/m
3. Age 40 years: 632 L/m
4. Age 50 years: 611 L/m
5. Age 60 years: 590 L/m
• Calculation
• Estimated Peak Flow in Women based on Age and height
1. Height 60 inches (152 cm)
1. Age 25 years: 365 L/m
2. Age 30 years: 357 L/m
3. Age 40 years: 342 L/m
4. Age 50 years: 327 L/m
5. Age 60 years: 312 L/m
2. Height 65 inches (165 cm)
1. Age 25 years: 401 L/m
2. Age 30 years: 394 L/m
3. Age 40 years: 379 L/m
4. Age 50 years: 364 L/m
5. Age 60 years: 349 L/m
3. Height 70 inches (178 cm)
1. Age 25 years: 439 L/m
2. Age 30 years: 431 L/m
3. Age 40 years: 416 L/m
4. Age 50 years: 401 L/m
5. Age 60 years: 386 L/m