- FEV1 / FVC <75% (Gaensler <75%); Recovery test (+) *) Criteria for diagnosis of allergic asthma due to fabric powder: - Diagnosing bronchial asthma (according to the above criteria), and - A history of allergy in their family (point of history of allergy ≥ 8), and IgE quantification > 100 UI / ml, and Skin test with cotton dust (+).