Table A General investigations
| Test | Who this applies to |
|---|---|
| Full blood count | All patients |
| Urea and electrolytes | All patients |
| Liver function tests | All patients |
| Chest x ray | All patients |
| Pulse oximetry | All patients. If <92% on air, then arterial blood gases |
| Electrocardiogram | Patients with cardiac and respiratory complications or comorbid illnesses |
| C-reactive protein | If influenza-related pneumonia is suspected |