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Predicated PFM
PFM Zones
| Zone | Reading | Description |
| Green Zone | 80 to 100 percent of the usual or normal peak flow readings are clear. | A peak flow reading in the green zone indicates that the asthma is under good control. |
| Yellow Zone | 50 to 79 percent of the usual or normal peak flow readings | Indicates caution. It may mean respiratory airways are narrowing and additional medication may be required. |
| Red Zone | Less than 50 percent of the usual or normal peak flow readings | Indicates a medical emergency. Severe airway narrowing may be occurring and immediate action needs to be taken. This would usually involve contacting a doctor or hospital. |
Normal Males*
| Age (Years) | 60" | 65" | 70" | 75" | 80" |
| 20 | 554 | 602 | 649 | 693 | 740 |
| 25 | 543 | 590 | 636 | 679 | 725 |
| 30 | 532 | 577 | 622 | 664 | 710 |
| 35 | 521 | 565 | 609 | 651 | 695 |
| 40 | 509 | 552 | 596 | 636 | 680 |
| 45 | 498 | 540 | 583 | 622 | 665 |
| 50 | 486 | 527 | 569 | 607 | 649 |
| 55 | 475 | 515 | 556 | 593 | 634 |
| 60 | 463 | 502 | 542 | 578 | 618 |
| 65 | 452 | 490 | 529 | 564 | 603 |
| 70 | 440 | 477 | 515 | 550 | 587 |
Normal Females*
| Age (Years) | 55" | 60" | 65" | 70" | 75" |
| 20 | 390 | 423 | 460 | 496 | 529 |
| 25 | 385 | 418 | 454 | 490 | 523 |
| 30 | 380 | 413 | 448 | 483 | 516 |
| 35 | 375 | 408 | 442 | 476 | 509 |
| 40 | 370 | 402 | 436 | 470 | 502 |
| 45 | 365 | 397 | 430 | 464 | 495 |
| 50 | 360 | 391 | 424 | 457 | 488 |
| 55 | 355 | 386 | 418 | 451 | 482 |
| 60 | 350 | 380 | 412 | 445 | 475 |
| 65 | 345 | 375 | 406 | 439 | 468 |
| 70 | 340 | 369 | 400 | 432 | 461 |
Normal Children and Adolescents1
| Height (inches) | Males & Females |
| 43" | 147 |
| 44" | 160 |
| 45" | 173 |
| 46" | 187 |
| 47" | 200 |
| 48" | 214 |
| 49" | 227 |
| 50" | 240 |
| 51" | 254 |
| 52" | 267 |
| 53" | 280 |
| 54" | 293 |
| 55" | 307 |
| 56" | 320 |
| 57" | 334 |
| 58" | 347 |
| 59" | 360 |
| 60" | 373 |
| 61" | 387 |
| 62" | 400 |
| 63" | 413 |
| 64" | 427 |
| 65" | 440 |
| 66" | 454 |
*Leiner GC. et al: Expiratory peak flow rate. AM Rev Respir Dis 88:644, 1963.
1 Polgar G. Promadhat V: Pulmonary Function Testing in Children: Techniques and Standards. Philadelphia, W.B. Saunders Company, 1971.