- Common tests when assessing severe asthma.
| Diagnostic study | Test |
| Radiology | • Chest x-ray |
| • Chest CT | |
| • Gastrointestinal assessment (PH/impedance probe, barium studies, or scoping) | |
| • Bronchoscopy (flexible versus rigid) with Bronchoalveolar lavage | |
| Blood and serological test | • CBC with differential looking for eosinophilia |
| • Total IgE | |
| • Skin prick testing or specific IgE measurement | |
| • Immunoglobulin level | |
| Others | • Sweat chloride test |
| • Spirometry (including post bronchodilatation, lung volumes) | |
| • Sleep studies | |
| • Genetic testing |
IgE: immunoglobulin E, CBC: complete blood count, CT: computed tomography