Will I need to do anything to prepare for the test? Are there any risks to the test? You may have a little discomfort when the tracer is injected during a perfusion scan. Allergic reactions to the tracer are rare and usually mild. What do the results mean? The scans may also show that you have a different condition affecting your lungs. References Bajc M, Jonson B. Int J Mol Imaging [Internet]. Mayo Foundation for Medical Education and Research; c— Pulmonary embolism: Diagnosis and treatment; Jun 13 [cited Jan 5]; [about 4 screens].
Pulmonary embolism: Symptoms and causes; Jun 13 [cited Jan 5]; [about 3 screens]. Bethesda MD : U. Radiological Society of North America, Inc. General Nuclear Medicine; [cited Jan 5]; [about 3 screens].
Pulmonary Embolism; [cited Jan 5]; [about 3 screens]. If the lungs are working as they should, the results of the two scans will match. If the scan results don't match, you may have a blood clot in the lung.
Ventilation and perfusion scans can be done on their own or together. The ventilation scan usually is done first. If you are breastfeeding, you may want to pump enough breast milk before the test to get through 1 to 2 days of feeding.
The radioactive tracer used in this test can get into your breast milk and is not good for the baby. You will need to take off any jewellery that might interfere with the scan. You may need to take off all or most of your clothes, depending on which area is being examined.
You will be given a cloth or paper covering to use during the test. During the scan, you might lie on your back with the scanning camera over or under your chest. Or you might sit with the camera next to your chest. The camera does not produce any radiation. For the ventilation scan, a mask will be placed over your mouth and nose.
Or you may have a nose clip on your nose and a tube in your mouth that you use for breathing. You will take a deep breath and hold it. The camera will take pictures as the tracer moves through your lungs. You may be asked to breathe the gas in and out through your mouth for several minutes.
You may then be asked to hold your breath for short periods about 10 seconds and to change positions. This is done so your lungs can be viewed from other angles. The camera may move to take pictures from different angles. You need to stay very still during the scans to avoid blurring the pictures. Afterward, the radioactive gas or mist will clear from your lungs as you breathe. For the perfusion scan, a small amount of the radioactive tracer is injected into your arm.
After the tracer is injected, the camera will take pictures as the tracer moves through your lungs. The camera may be repositioned around your chest to get different views.
The two scans are usually done together and will take about an hour. The ventilation scan takes about 15 to 30 minutes, and the perfusion scan takes about 5 to 10 minutes. The scans can be done on their own. Breathing through the mask during the ventilation scan may be uncomfortable, especially if you feel very short of breath. But you will be given plenty of oxygen through the mask. If you have a perfusion scan, you may feel nothing at all from the needle, or you may feel a brief sting or pinch.
Otherwise, a lung scan is usually painless. You may find it hard to stay still. Ask for a pillow or blanket to make yourself as comfortable as possible before the scan begins. The results of a lung scan are usually ready in 1 day. The radioactive tracer is evenly distributed throughout the lungs during ventilation and perfusion. The ventilation scan is abnormal, but the perfusion scan is normal.
This may mean that there are abnormal airways in all or parts of the lung. The scanner detects the energy that the radioisotopes release inside your body and uses the energy to make pictures of your lungs. Lung VQ scans involve little pain or risk for most people. You may bruise at the injection site. In rare instances, some people have a treatable allergic reaction to the radioisotope. This test uses small amounts of radiation from the radioisotope that you breathe in and that is injected into your vein.
Talk to your doctor and the technicians performing the test about whether you are or could be pregnant. If the test is not urgent, they may have you wait to do the test until after your pregnancy. If it is urgent, the technicians will take extra steps to protect your baby during this test.
Let your doctor know if you are breastfeeding because radiation can pass into your breast milk. You may want to pump and save enough breast milk for one to two days after your test, or you may bottle-feed your baby for that time.
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