Lab

Peak Expiratory Flow Rate

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

  • See Also
  1. Pulmonary Function Test
  2. Lung Volumes
  3. Diffusing Capacity
  4. Inhalation Challenge Test
  5. Exercise Spirometry
  6. Functional Residual Capacity
  7. Vital Capacity
  8. Spirometry Lower Limit of Normal (PFT LLN)
  9. Obstructive Lung Disease
  10. Restrictive Lung Disease
  • 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
  • References
  1. Knudson (1983) Am Rev Respir Dis 127:725-34 [PubMed]