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Perfusion Scan (MAA)

Overview

A Lung Perfusion scan (MAA scan) is a diagnostic nuclear medicine test used to evaluate blood flow (perfusion) to the lungs in specific situations. It helps doctors detect blockages, clots, or uneven blood flow that may affect lung function.

In addition to assessing lung health, this scan is also used to:

  • Assess lung function before surgery (such as lung resection or transplantation)
  • Monitor lung function after treatment or surgery
  • Evaluate lung diseases such as chronic obstructive pulmonary disease (COPD) or emphysema
  • Quantify liver-lung shunts (to check if blood is bypassing the liver and flowing directly to the lungs)

  • You will receive a small amount of radiopharmaceutical injection (MAA) into a vein in your arm to evaluate blood flow through your lungs.
  • You will lie down on a table while a gamma camera captures images of your lungs. The camera will move around your chest but will not touch you. This part takes about 15-30 minutes.
  • In some cases, images of your brain and abdomen may also be taken to evaluate shunts.
  • The procedure is generally painless, though you may feel a slight pinch from the injection.

The imaging process takes about 15–30 minutes, while the entire process usually takes 30–60 minutes.

  • Medications: Inform your doctor about all medications you are taking, including blood thinners or inhalers. You may be asked to stop certain medications before the scan.
  • Allergies: Notify your doctor if you have any allergies, especially to iodine, contrast agents, or medications.
  • Pregnancy and breastfeeding: If you are pregnant or breastfeeding, inform your doctor. Perfusion scans are generally avoided during pregnancy unless necessary. 

  • The test is safe and well-tolerated.
  • Exposure to radiation is minimal, and the tracer leaves the body naturally within 24 hours.
  • Allergic reactions are extremely rare, but you should discuss any concerns or allergies with your healthcare provider before the scan.

  • You can resume normal activities immediately after the scan.
  • Drink plenty of fluids after the scan to help flush the radioactive tracer from your body.
  • The radioactive material will naturally leave your body within 24 hours.

Disclaimer:

The information in this Health Library is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional with any questions about a medical condition or before starting any treatment. Use of this site and its content does not establish a doctor–patient relationship. In case of a medical emergency, call your local emergency number or visit the nearest emergency facility immediately.