Check for symptoms such as cough, fever, chills, shortness of breath, chest pain, and fatigue
Measure oxygen saturation with a pulse oximeter
Listen to the lungs with a stethoscope for crackles, wheezing, or decreased breath sounds
Get a chest X-ray to look for lung infection or fluid
Have a physical exam by a healthcare professional
Get blood tests to check for infection and inflammation
Provide a sputum sample for lab testing if coughing up mucus
Consider a CT scan if the diagnosis is unclear
Test for viruses or bacteria with swabs or other lab tests when needed
Seek urgent medical care if breathing is difficult, lips are blue, or symptoms are severe