V/Q Scan

A V/Q scan consists of two imaging tests that look for certain lung problems .

A V/Q scan consists of two imaging tests that look for certain lung problems . The tests are: A ventilation scan measures how air moves in and out of your lungs A perfusion scan measures circulation (how blood flows in the lungs) The two scans may be done separately or together. A V/Q scan uses a small amount of a radioactive substance called a tracer. The tracer can help your health care provider see how well air and blood flow through your lungs. The scans help diagnose different lung conditions, but they are most often used to check for a pulmonary embolism (PE). A PE is a blood clot in your lungs. A PE causes a sudden blockage in a lung artery (a blood vessel that carries oxygen-rich blood from your heart and lungs to your body). This results in your lungs not getting enough air or blood flow. A PE usually happens due to deep vein thrombosis (DVT). DVT is a blood clot that forms in a vein deep in your body. Most DVT clots occur in your lower leg or thigh. When a DVT blood clot breaks loose and travels through the bloodstream to the lungs it can cause a PE. This is a serious condition and can be life-threatening. Other names: ventilation/perfusion scan, pulmonary ventilation/perfusion scan, lung scan, lung V/Q scan, lung scintigraphy

Why is this test ordered? You may need a V/Q scan if you have symptoms of a pulmonary embolism (PE). These include: Shortness of breath Rapid breathing Chest pain or discomfort, which usually gets worse when you cough or take a deep breath Increased heart rate Coughing up blood Very low blood pressure , lightheadedness, or fainting Many people with a PE don't have symptoms. But your provider may order a V/Q scan based on your physical exam and/or if you have certain risk factors. These could include: Family history of blood clots or PE Long periods of inactivity, for example sitting for too long on long car trips or flights or bed rest Recent surgery Having obesity Older age Smoking You may also be at higher risk if you have: A clotting disorder Cancer Heart disease Other lung disease, such as COPD