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Peak Expiratory Flow RateAka: Peak Flow

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  1. 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
  2. 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)
  3. 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)
  4. 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
  5. Estimated Peak Flow in Men based on Age and height
    1. Height 65 inches
      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
      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
      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
  6. Estimated Peak Flow in Women based on Age and height
    1. Height 60 inches
      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
      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
      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
  7. References
    1. Knudson (1983) Am Rev Respir Dis 127:725

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