Please read this leaflet carefully before your appointment. It explains the procedure for a general lung scan (VQ scan).
What is a lung scan (VQ scan)?
Your doctor has requested a lung scan to evaluate the air and blood supply to your lungs. By comparing the two, we can identify differences that might indicate a clot on the lung (pulmonary embolism) requiring treatment.
What does the test involve?
The scan is performed in two parts using a gamma camera:
- Air Supply: You will breathe in a radioactive gas while images are taken for about ten minutes. It is essential to keep very still.
- Blood Supply: You will then receive a small injection, followed by another set of identical images to show the blood flow in your lungs.
Radiation and Safety
The test uses a small, safe amount of radiation from both the gas and the injection. For context, the radiation dose is equivalent to spending 4 months in Cornwall (where natural background radiation is slightly higher than average).
Breastfeeding and Attendance
Breastfeeding: If you are breastfeeding, you will need to stop for 18 hours following the scan. Specific instructions will be provided at the department.
Attendance: Please attend the appointment alone if possible. Your technologist will be happy to answer any questions during the procedure.