6 doctors weighed in:

What are the differences between pulmonary perfusion scan and pulmonary ventilation scan?

6 doctors weighed in
Dr. Shahin Tavackoli
Internal Medicine - Cardiology
4 doctors agree

In brief: Lung V-Q scan

Ventilation scanning involves the patient breathing in a radiotracer while perfusion scanning involves injecting the radiotracer through an iv.
The procedure is done usually to evaluate the presence of absence of a pulmonary embolism (usually a blood clot) and involves comparing the radiotracer's presence in the alveoli vs. Its presence in the lung circulation.

In brief: Lung V-Q scan

Ventilation scanning involves the patient breathing in a radiotracer while perfusion scanning involves injecting the radiotracer through an iv.
The procedure is done usually to evaluate the presence of absence of a pulmonary embolism (usually a blood clot) and involves comparing the radiotracer's presence in the alveoli vs. Its presence in the lung circulation.
Dr. Shahin Tavackoli
Dr. Shahin Tavackoli
Thank
1 comment
Dr. Michael DePietro
Usually when possible the scans are done as part of the same test, a ventilation/ perfusion scan, or VQ scan. The reason is that normally when there is an abnormality in ventilation, such as with pneumonia etc.. there is a matched decrease in perfusion blood flow) to the same area. A defect in blood flow to an area with normal ventilation suggests a blood clot in the lung which can be dangerous
Dr. Thomas Heston
Family Medicine

In brief: Blood vs air

The perfusion scan images blood perfusion of the lungs.
The ventilation scan is used to image ventilation by air of the lungs. Generally, both are performed together to see how well lung perfusion (blood) matches lung ventilation (air).

In brief: Blood vs air

The perfusion scan images blood perfusion of the lungs.
The ventilation scan is used to image ventilation by air of the lungs. Generally, both are performed together to see how well lung perfusion (blood) matches lung ventilation (air).
Dr. Thomas Heston
Dr. Thomas Heston
Thank
Get help from a real doctor now
Dr. Aaron Milstone
Board Certified, Internal Medicine - Pulmonology
24 years in practice
1M people helped
Continue
111,000 doctors available
Read more answers from doctors