Respiratory
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Tap the finding that most changes immediate management.
A 34-year-old woman reports eight months of cough and chest tightness, waking her at night and worse after exercise.
She has hay fever and her mother has asthma.
She has never smoked and takes no medication.
Her eosinophil count is within the laboratory reference range and her FeNO is 32 ppb.
After salbutamol her FEV1 rises from 1.50 to 1.69 litres, against a predicted 2.90.
She is diagnosed with asthma and started on maintenance inhalers.
Not decisiveTaking no inhaled steroid means her test results are not suppressed. It does not confirm asthma.
ContributoryBoth are rule-in tests. An eosinophil count within the reference range and a FeNO of 32 do not exclude asthma.
Pivot12.7% of baseline, but 190 ml. Adults need 12% and 200 ml.
A real case, shown solved — every batch works exactly like this.