The diagnosis of respiratory function in asthma bronchiale includes:a. FEV1 increases by 12% but by a minimum of 200mL after 400 microgram salbutamol in case of airway obstructionb, For normal respiratory function, FEV1 decreases by 20% for bronchial challengec, In case of normal respiratory function and exercise-induced asthma, 15 minutes after exercise, FEV1 decreases by 15%d. diffusion capacity <80% of the reference value in CFE V n <80

The diagnosis of respiratory function in asthma bronchiale includes:

a. FEV1 increases by 12% but by a minimum of 200mL after 400 microgram salbutamol in case of airway obstruction: This statement is correct. In asthma, the airways are often constricted or obstructed. Salbutamol is a bronchodilator that helps to open up the airways. An increase in FEV1 (Forced Expiratory Volume in 1 second) by at least 12% and 200 mL after administration of salbutamol indicates a positive bronchodilator response, which is suggestive of asthma.

b. For normal respiratory function, FEV1 decreases by 20% for bronchial challenge: This statement is incorrect. In a bronchial challenge test, a decrease in FEV1 by 20% or more is indicative of airway hyperresponsiveness, which is a characteristic of asthma. In normal respiratory function, there should not be a significant decrease in FEV1.

c. In case of normal respiratory function and exercise-induced asthma, 15 minutes after exercise, FEV1 decreases by 15%: This statement is correct. Exercise-induced bronchoconstriction (EIB), previously known as exercise-induced asthma, is diagnosed when there is a 10-15% decrease in FEV1 from baseline after exercise.

d. Diffusion capacity <80% of the reference value in CFE V n <80: This statement is unclear. Diffusion capacity refers to the ability of the lungs to transfer gases. In asthma, this is usually normal. The term "CFE V n <80" is not clear and may be a typographical error. If it refers to FEV1/FVC ratio, then a value less than 80% may indicate obstructive lung disease like asthma. However, this alone is not diagnostic and must be considered along with other clinical findings and tests.