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Test Details
Test Code:NM0046
Test Name:Lung Ventilation Scan
Test Details & Preparation
A lung scan is a nuclear scanning test that is most commonly used to detect a blood clot that is preventing normal blood flow to part of a lung (pulmonary embolism). Two types of lung scans are usually done together: ventilation scan and perfusion scan.

If the lungs are working normally, blood flow on a perfusion scan matches air flow on a ventilation scan. A mismatch between the ventilation and perfusion scans may mean a pulmonary embolism.

Ventilation and perfusion scans can be done separately or together to diagnose certain lung diseases. If both scans are done, the test is called a V/Q scan. The ventilation scan usually is done first.

A lung scan is done to find a blood clot that is preventing normal blood flow (perfusion) to part of a lung (pulmonary embolism) check the flow of blood (perfusion) or air (ventilation) through the lungs see which parts of the lungs are working and which are damaged. This is often done before lung surgery to remove parts of the lung.

Before your lung scan, tell your doctor if you are or might be pregnant you are breastfeeding. A chest X-ray is usually done the same day either before or after the lung scan. A lung scan is usually done by a nuclear medicine technologist. The scan pictures are usually interpreted by a radiologist or nuclear medicine specialist. You will need to remove any jewellery that might interfere with the scan. You may need to take off all or most of your clothes depending on which area is being examined.

A normal lung scan shows that the radioactive tracer is evenly distributed throughout the lungs during ventilation and perfusion. An abnormal lung scan shows that the ventilation scan is abnormal but the perfusion scan is normal. This may mean abnormal airways in all or parts of the lung. Chronic obstructive pulmonary disease (COPD) or asthma may be present the perfusion scan is abnormal but the ventilation scan is normal. Depending on the difference between the two scans, a pulmonary embolism may be present and both the ventilation and perfusion scans are abnormal. This can be caused by certain types of lung disease, such as pneumonia, COPD, or a pulmonary embolism.
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