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Functional Response
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None
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Small
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Moderate
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Large
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FEV1 change | Decrements of <3% | Decrements of 3% to ≤10% | Decrements of >10% but <20% | Decrements of ≥20% |
Nonspecific bronchial responsiveness
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Within normal range | Increases of <100% | Increases of ≤300% | Increases of >300% |
Airway resistance (SRaw) | Within normal range (± 20%) | SRaw increased <100% | SRaw increased up to 200% or up to 15cm H2O/s | SRaw increased >200% or more than 15 cm H2O/s |
Duration of response | None | <4 hr | >4 but ≤24 hr | >24 hr
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Table 2b |
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Symptomatic Response
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Normal
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Mild
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Moderate
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Severe
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Wheeze | None | With otherwise normal breathing | With shortness of breath | Persistent with shortness of breath |
Cough | Infrequent cough
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Cough with deep breath | Frequent spontaneous cough | Persistent uncontrollable cough |
Chest pain | None | Discomfort just noticeable on exercise or deep breath | Marked discomfort on exercise or deep breath | Severe discomfort on exercise or deep breath |
Duration of response | None | <4 hr | >4 but ≤24 hr | >24 hr
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Table 2c |
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Impact of Various Functional and/or Symptomatic
Responses
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Normal Functional and/or Symptomatic Responses
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Small Functional and/or Mild Symptomatic Responses
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Moderate Functional and/or Symptomatic Responses
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Large Functional and/or Severe Symptomatic Responses
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Interference with normal activity | None | Few individuals likely to limit activity | Many individuals likely to limit activity | Most individuals likely to limit activity |
Medical treatment/ Self Medication | No change | Normal medication as needed | Increased frequency or additional medication use | Increased likelihood of physician or ER visit
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