A Lung Scan (Ventilation/Perfusion) evaluates both the air (ventilation) flow and the blood (perfusion) supply to the lungs. Diseases such as emphysema, bronchitis, and asthma can be seen with the ventilation part of the exam, and blood clots can be seen with the perfusion part of the exam.
What to Expect
- The patient is given two radioactive materials.
- The first part involves breathing in a radioactive aerosol through a mouthpiece or a mask.
- The patient is then placed under a camera and 8 pictures are taken.
- The second part involves injecting another radioactive material into a vein and 8 more pictures are taken of the lungs.
- This test is approximately 1 to 1-1/2 hours.
- The patient should have nothing to eat or drink for 2 hours and will need an AP supine chest x-ray before the lung scan.