BACK TOTOP Browse A-ZSearchBrowse A-ZABCDEFGHIJKLMNOPQRSTUVWXYZ0-9 E-mail FormEmail ResultsName:Email address:Recipients Name:Recipients address:Message: Print-FriendlyBookmarksbookmarks-menuPulmonary ventilation/perfusion scanV/Q scan; Ventilation/perfusion scan; Lung ventilation/perfusion scan; Pulmonary embolism - V/Q scan; PE- V/Q scan; Blood clot - V/Q scanA pulmonary ventilation/perfusion scan involves two nuclear scan tests to measure breathing (ventilation) and circulation (perfusion) in all areas of the lungs.Nuclear scanA positron emission tomography (PET) scan is a type of imaging test. It uses a radioactive substance called a tracer to look for disease in the body...Read Article Now Book Mark Article How the Test is Performed A pulmonary ventilation/perfusion scan is actually 2 tests. They may be done separately or together.During the perfusion scan, a health care provider injects radioactive albumin into your vein. You are placed on a movable table that is under the arm of a scanner. The machine scans your lungs as blood flows through them to find the location of the radioactive particles.During the ventilation scan, you breathe in radioactive gas through a mask while you are sitting or lying on a table under the scanner arm. How to Prepare for the Test You do not need to stop eating (fast), be on a special diet, or take any medicines before the test.A chest x-ray is usually done before, and sometimes after a ventilation and perfusion scan.Chest x-rayA chest x-ray is an x-ray of the chest, lungs, heart, large arteries, ribs, and diaphragm.ImageRead Article Now Book Mark Article You wear a hospital gown or comfortable clothing that does not have metal fasteners. How the Test will Feel The table may feel hard or cold. You may feel a sharp prick when the IV is placed in the vein in your arm for the perfusion part of the scan.The mask used during the ventilation scan may make you feel nervous about being in a small space (claustrophobia). You must lie still during the scan.The radioisotope injection usually does not cause discomfort.RadioisotopeA positron emission tomography (PET) scan is a type of imaging test. It uses a radioactive substance called a tracer to look for disease in the body...Read Article Now Book Mark Article Why the Test is Performed The ventilation scan is used to see how well air moves and blood flows through the lungs. The perfusion scan measures the blood supply through the lungs.A ventilation and perfusion scan is most often done to detect an acute pulmonary embolus (blood clot in the lungs). It is also used to:Pulmonary embolusA pulmonary embolus is a blockage of an artery in the lungs. The most common cause of the blockage is a blood clot.ImageRead Article Now Book Mark Article Detect abnormal circulation (shunts) in the blood vessels of the lungs (pulmonary vessels) Detect abnormal circulation from multiple old blood clots (chronic thromboembolic disease) Test regional (different lung areas) lung function in people with advanced pulmonary disease, such as COPDPulmonary diseaseLung disease is any problem in the lungs that prevents the lungs from working properly. There are three main types of lung disease:Airway diseases -...ImageRead Article Now Book Mark Article COPDChronic obstructive pulmonary disease (COPD) is a common lung disease. Having COPD makes it hard to breathe. There are two main forms of COPD:Chroni...ImageRead Article Now Book Mark Article Normal Results The provider should take a ventilation and perfusion scan and then evaluate it with a chest x-ray. All parts of both lungs should take up the radioisotope evenly. What Abnormal Results Mean If the lungs take up lower than normal amounts of radioisotope during a ventilation or perfusion scan, it may be due to any of the following:Airway obstruction Airway obstructionBlockage of the upper airway occurs when the upper breathing passages become narrowed or blocked, making it hard to breathe. Areas in the upper airw...ImageRead Article Now Book Mark Article Chronic obstructive pulmonary disease (COPD) Pneumonia PneumoniaPneumonia is a breathing (respiratory) condition in which there is an infection of the lung. This article covers community-acquired pneumonia (CAP). ...ImageRead Article Now Book Mark Article Narrowing of the pulmonary artery Pneumonitis (inflammation of the lungs due to breathing in a foreign substance) Pulmonary embolus Chronic thromboembolic pulmonary disease Reduced breathing and ventilation ability Risks Risks are about the same as for x-rays (radiation) and needle pricks.No radiation is released from the scanner. Instead, it detects radiation and converts it into an image.There is a small exposure to radiation from the radioisotope. The radioisotopes used during scans are short-lived. All of the radiation leaves the body in a few days. However, as with any radiation exposure, caution is advised for pregnant or breastfeeding women.There is a slight risk for infection or bleeding at the site where the needle is inserted. The risk with perfusion scan is the same as with inserting an intravenous needle for any other purpose.IntravenousIntravenous means "within a vein. " Most often it refers to giving medicines or fluids through a needle or tube inserted into a vein. This allows th...Read Article Now Book Mark Article In rare cases, a person may develop an allergy to the radioisotope. This may include a serious anaphylactic reaction.AllergyAn allergy is an immune response or reaction to substances that are usually not harmful.ImageRead Article Now Book Mark Article Anaphylactic reactionAnaphylaxis is a life-threatening type of allergic reaction.ImageRead Article Now Book Mark Article Considerations A pulmonary ventilation and perfusion scan may be a lower-risk alternative to pulmonary angiography for evaluating disorders of the lung blood supply.Pulmonary angiographyPulmonary angiography is a test to see how blood flows through the lung. Angiography is an imaging test that uses x-rays and a special dye to see th...ImageRead Article Now Book Mark Article This test may not provide a definite diagnosis, particularly in people with lung disease. Other tests may be needed to confirm or rule out the findings of a pulmonary ventilation and perfusion scan.This test has largely been replaced by CT pulmonary angiography for diagnosing pulmonary embolism. However, people with kidney problems or an allergy to contrast dye can more safely have this test.Open ReferencesReferencesGoldhaber SZ, Piazza G. Pulmonary embolism and deep vein thrombosis. In: Libby P, Bonow RO, Mann, DL, Tomaselli GF, Bhatt DL, Solomon SD, eds. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 12th ed. Philadelphia, PA: Elsevier; 2022:chap 87.Herring W. Nuclear medicine: understanding the principles and recognizing the basics. In: Herring W, ed. Learning Radiology: Recognizing the Basics. 4th ed. Philadelphia, PA: Elsevier; 2020:e24-e42.Murphy JA, Safi F. Ventilation-perfusion scan. In: Hughes G, ed. A Medication Guide to Internal Medicine Tests and Procedures. Philadelphia, PA: Elsevier; 2022:chap 60.AllVideoImagesTogAlbumin injection - illustration Radioactive albumin injection is part of a nuclear scan test that is performed to measure the supply of blood through the lungs. After the injection, the lungs are scanned to detect the location of the radioactive particles as blood flows through the lungs.Albumin injectionillustrationAlbumin injection - illustration Radioactive albumin injection is part of a nuclear scan test that is performed to measure the supply of blood through the lungs. After the injection, the lungs are scanned to detect the location of the radioactive particles as blood flows through the lungs.Albumin injectionillustration Tests for Pulmonary ventilation/perfusion scan Pulmonary ventilation/perfusion scanLung PET scanRelated Information PET scan(Medical Test)Pulmonary embolus(Condition)Lung disease(Condition)Chronic obstructive pulmonary disease (COPD)(Condition)Breathing difficulty(Symptoms)X-ray(Medical Test)Community-acquired pneumonia in adults(Condition)Pneumonia - InDepth(In-Depth) Review Date: 7/31/2022 Reviewed By: Denis Hadjiliadis, MD, MHS, Paul F. Harron, Jr. Professor of Medicine, Pulmonary, Allergy, and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. No warranty of any kind, either expressed or implied, is made as to the accuracy, reliability, timeliness, or correctness of any translations made by a third-party service of the information provided herein into any other language. © 1997- A.D.A.M., a business unit of Ebix, Inc. 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Pulmonary ventilation/perfusion scanV/Q scan; Ventilation/perfusion scan; Lung ventilation/perfusion scan; Pulmonary embolism - V/Q scan; PE- V/Q scan; Blood clot - V/Q scanA pulmonary ventilation/perfusion scan involves two nuclear scan tests to measure breathing (ventilation) and circulation (perfusion) in all areas of the lungs.Nuclear scanA positron emission tomography (PET) scan is a type of imaging test. It uses a radioactive substance called a tracer to look for disease in the body...Read Article Now Book Mark Article How the Test is Performed A pulmonary ventilation/perfusion scan is actually 2 tests. They may be done separately or together.During the perfusion scan, a health care provider injects radioactive albumin into your vein. You are placed on a movable table that is under the arm of a scanner. The machine scans your lungs as blood flows through them to find the location of the radioactive particles.During the ventilation scan, you breathe in radioactive gas through a mask while you are sitting or lying on a table under the scanner arm. How to Prepare for the Test You do not need to stop eating (fast), be on a special diet, or take any medicines before the test.A chest x-ray is usually done before, and sometimes after a ventilation and perfusion scan.Chest x-rayA chest x-ray is an x-ray of the chest, lungs, heart, large arteries, ribs, and diaphragm.ImageRead Article Now Book Mark Article You wear a hospital gown or comfortable clothing that does not have metal fasteners. How the Test will Feel The table may feel hard or cold. You may feel a sharp prick when the IV is placed in the vein in your arm for the perfusion part of the scan.The mask used during the ventilation scan may make you feel nervous about being in a small space (claustrophobia). You must lie still during the scan.The radioisotope injection usually does not cause discomfort.RadioisotopeA positron emission tomography (PET) scan is a type of imaging test. It uses a radioactive substance called a tracer to look for disease in the body...Read Article Now Book Mark Article Why the Test is Performed The ventilation scan is used to see how well air moves and blood flows through the lungs. The perfusion scan measures the blood supply through the lungs.A ventilation and perfusion scan is most often done to detect an acute pulmonary embolus (blood clot in the lungs). It is also used to:Pulmonary embolusA pulmonary embolus is a blockage of an artery in the lungs. The most common cause of the blockage is a blood clot.ImageRead Article Now Book Mark Article Detect abnormal circulation (shunts) in the blood vessels of the lungs (pulmonary vessels) Detect abnormal circulation from multiple old blood clots (chronic thromboembolic disease) Test regional (different lung areas) lung function in people with advanced pulmonary disease, such as COPDPulmonary diseaseLung disease is any problem in the lungs that prevents the lungs from working properly. There are three main types of lung disease:Airway diseases -...ImageRead Article Now Book Mark Article COPDChronic obstructive pulmonary disease (COPD) is a common lung disease. Having COPD makes it hard to breathe. There are two main forms of COPD:Chroni...ImageRead Article Now Book Mark Article Normal Results The provider should take a ventilation and perfusion scan and then evaluate it with a chest x-ray. All parts of both lungs should take up the radioisotope evenly. What Abnormal Results Mean If the lungs take up lower than normal amounts of radioisotope during a ventilation or perfusion scan, it may be due to any of the following:Airway obstruction Airway obstructionBlockage of the upper airway occurs when the upper breathing passages become narrowed or blocked, making it hard to breathe. Areas in the upper airw...ImageRead Article Now Book Mark Article Chronic obstructive pulmonary disease (COPD) Pneumonia PneumoniaPneumonia is a breathing (respiratory) condition in which there is an infection of the lung. This article covers community-acquired pneumonia (CAP). ...ImageRead Article Now Book Mark Article Narrowing of the pulmonary artery Pneumonitis (inflammation of the lungs due to breathing in a foreign substance) Pulmonary embolus Chronic thromboembolic pulmonary disease Reduced breathing and ventilation ability Risks Risks are about the same as for x-rays (radiation) and needle pricks.No radiation is released from the scanner. Instead, it detects radiation and converts it into an image.There is a small exposure to radiation from the radioisotope. The radioisotopes used during scans are short-lived. All of the radiation leaves the body in a few days. However, as with any radiation exposure, caution is advised for pregnant or breastfeeding women.There is a slight risk for infection or bleeding at the site where the needle is inserted. The risk with perfusion scan is the same as with inserting an intravenous needle for any other purpose.IntravenousIntravenous means "within a vein. " Most often it refers to giving medicines or fluids through a needle or tube inserted into a vein. This allows th...Read Article Now Book Mark Article In rare cases, a person may develop an allergy to the radioisotope. This may include a serious anaphylactic reaction.AllergyAn allergy is an immune response or reaction to substances that are usually not harmful.ImageRead Article Now Book Mark Article Anaphylactic reactionAnaphylaxis is a life-threatening type of allergic reaction.ImageRead Article Now Book Mark Article Considerations A pulmonary ventilation and perfusion scan may be a lower-risk alternative to pulmonary angiography for evaluating disorders of the lung blood supply.Pulmonary angiographyPulmonary angiography is a test to see how blood flows through the lung. Angiography is an imaging test that uses x-rays and a special dye to see th...ImageRead Article Now Book Mark Article This test may not provide a definite diagnosis, particularly in people with lung disease. Other tests may be needed to confirm or rule out the findings of a pulmonary ventilation and perfusion scan.This test has largely been replaced by CT pulmonary angiography for diagnosing pulmonary embolism. However, people with kidney problems or an allergy to contrast dye can more safely have this test.Open ReferencesReferencesGoldhaber SZ, Piazza G. Pulmonary embolism and deep vein thrombosis. In: Libby P, Bonow RO, Mann, DL, Tomaselli GF, Bhatt DL, Solomon SD, eds. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 12th ed. Philadelphia, PA: Elsevier; 2022:chap 87.Herring W. Nuclear medicine: understanding the principles and recognizing the basics. In: Herring W, ed. Learning Radiology: Recognizing the Basics. 4th ed. Philadelphia, PA: Elsevier; 2020:e24-e42.Murphy JA, Safi F. Ventilation-perfusion scan. In: Hughes G, ed. A Medication Guide to Internal Medicine Tests and Procedures. Philadelphia, PA: Elsevier; 2022:chap 60.