Diagnosis is based on a physical examination, medical history and symptoms. The doctor may order tests to rule out other conditions such as asthma or pneumonia.

These tests include:

Sputum Culture or Nasal Swab for Respiratory Viruses. Tests for the presence of bacteria or viruses in the sputum and identifies the organism so that the appropriate antibiotic can be prescribed.

Pulmonary Function Test. Also known as lung function test, it measures the airflow and volume of air in the lungs and allows your doctor to measure how well your lungs are functioning.

Chest X-ray or CAT Scan. These tests can confirm diagnosis of bronchitis and rule out pneumonia or other lung conditions.

Blood Tests. To test for inflammation of the lungs.