The evaluation of asthma begins with a complete history and physical examination.

Physical findings in those with asthma may include:

• Cyanosis
• Low blood oxygen levels
• Rapid respiratory rate
• Wheezing
• Signs of severe difficulty breathing
• Rib retractions
• Nasal flaring
• Use of accessory muscles

The diagnosis of asthma is usually confirmed through testing.

Tests for asthma may include:

• Pulse oximetry
• Chest x-ray
• Arterial blood gas
• Pulmonary function tests with response to bronchodilator medications
• Allergic skin testing