(i) Measurement of pulmonary ventilation: this test is considered as one of the most useful tests in confirming the diagnosis of asthma and assessing the level of asthma control, recommended for use in hospitals or institutions where such a test is available; (ii) Measurement of variation in PEF: this test is used to confirm the diagnosis of asthma and assess the level of asthma control in patients with atypical asthma (Appendix 1). Variation in diurnal PEF can be determined with a mini peak flow meter; (iii) Bronchial provocation test: this test is used to determine the presence of airway hyperresponsiveness. It is recommendable that patients with atypical presentations be referred to hospitals or institutions where bronchial provocation test is available, so as to confirm the diagnosis of asthma; (iv) Bronchodilation test: this test is used to determine the reversibility of airflow obstruction, which supports the diagnosis of asthma (Appendix 2).
Skin prick test: sensitization to allergens among asthmatic patients can be confirmed by skin prick tests. The test can be used to identify the risk factors responsible for the development and exacerbation of asthma and to screen patients who might respond to specific immunotherapy.