Diagnosis

A doctor's examination and plain chest X-ray may be all that is needed to diagnose atelectasis. However, other tests may be done to confirm the diagnosis or determine the type or severity of atelectasis. They include:

• CT scan. Since a CT is a more sensitive technique than an X-ray, it may sometimes help better detect the cause and type of atelectasis.
• Oximetry. This simple test uses a small device placed on one of your fingers to measure your blood-oxygen level. It helps determine the severity of atelectasis.
• Ultrasound of the thorax. This noninvasive test can help tell the difference between atelectasis, hardening and swelling of a lung due to fluid in the air sacs (lung consolidation), and pleural effusion.
• Bronchoscopy. A flexible, lighted tube inserted down your throat allows your doctor to see what may be causing a blockage, such as a mucus plug, tumor or foreign body. This procedure may also be used to remove the blockages.