Peak Expiratory Flow Rate

Aka: Peak Expiratory Flow Rate, Peak Expiratory Flow, Peak Flow, PEFR

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II. 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]

III. 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)

IV. 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

V. 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

VI. 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

VII. 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

VIII. References

  1. Knudson (1983) Am Rev Respir Dis 127:725-34 [PubMed]

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