What is a lung scan?

A lung scan is a test that detects pulmonary emboli, that is the presence of blood clots in your lungs.

How does a lung scan work?

There are two parts to the lung scan:              

Part 1: Is called the ventilation scan and this examines the air flow to the lungs/ you will be asked to breathe in a gas mixed with a radiotracer. This radiotracer emits a small amount of radiation which can be detected by a gamma camera. Images of your lungs will be taken in several positions.

Part 2: You will then have an injection of another radiotracer and the blood flow to your lungs will be examined, again by imaging with the camera.

The results are derived from the comparison of the 2 scans.

Is this test safe?

Yes. You will receive a small amount of radiation from the radiotracer in parts 1 and 2.

How long will the test take?

Allow about 1 hour from when you arrive the department until you leave.

What are the preparations that I need to take?

None. You may eat and drink prior to the scan and take your usually medications. Please bring along any recent Chest X-ray.

Are there any restrictions during or after the scan?

Yes. You should not nurse a small child from the time that you receive the injection until 12 hours you have completed the study.

If you are breast feeding, pregnant or think that you might be pregnant, please tell a staff member BEFORE the procedure starts.

What should I do following the test?

We ask that you:

  1. Keep yourself well hydrated for the next 24 hours. A substantial amount of the Tc99m injection will pass out through your urine.
  2. Keep your distance from pregnant woman or children.
  3. If you are seeing your doctor or any other health professional immediately after your scan please notify them that you are still a source of radiation.
  4. We ask that you do not schedule any other appointments for yourself for the rest of the day.



9716 3600


 8042 3000


9911 6800

Five Dock

8705 8300


9598 0100


8228 9000

North Strathfield

8282 8100

North Sydney (Mater Imaging)

9955 4466
Go to top