Indocyanine Green (ICG) Videoangiography
What is ICG Videoangiography?
ICG Videoangiography is a test to find out about the blood flow of the
choroid, the layer of major blood vessels lying under the retina. These
vessels supply blood to outer layers of the retina. The test takes about
30 minutes. Photographers, who are experts in this area, take the
pictures. It is not an x-ray. The doctor will be able to look at the
pictures on a computer screen as soon as the test is done.
The test is done with a special camera that has a video attachment.
Indocyanine green is a green colored dye. It is injected into a vein in
your arm. The dye travels through your body to the blood vessels in the
retina and choroid in 10 to 20 seconds. Many pictures are taken as the
dye moves through these blood vessels. The result is a set of pictures
that show the doctor the blood flow in your eye. This test is often
combined with fluorescein angiography, which is similar to ICG
videoangiography but uses a different dye.
If you take metformin (glucophage) you may be asked to stop your
medicine for 48 hours after this test. Your doctor will tell you if you
need to do this. People who are allergic to iodine and/or shellfish
should not receive this dye. Pregnant or nursing women should avoid
What You Can Expect
There may be slight pain or bruising at the injection site, much like
having blood drawn for lab tests.
Please let your nurse or doctor know if you have any problems either
during the injection or in the day or so after the test. Please call if you
have any problems or questions.
If you have any problems breathing or a severe allergic reaction, call
University Station Eye Clinic, 8 a.m. to 4:30 p.m., Monday through
Friday (608) 263-7171
When the clinic is closed, your call will be forwarded to the hospital
paging operator. Ask for the “Eye Resident on Call”. Give the operator
your name and phone number with area code. The doctor will call you
If you live out of the area, call 1-800-323-8942 and ask to be transferred
to the above number.
Please call if you have any questions or concerns.
Your health care team may have given you this information as part of your care. If so, please use it and call if you
have any questions. If this information was not given to you as part of your care, please check with your doctor. This
is not medical advice. This is not to be used for diagnosis or treatment of any medical condition. Because each
person’s health needs are different, you should talk with your doctor or others on your health care team when using
this information. If you have an emergency, please call 911. Copyright 1/2016. University of Wisconsin Hospitals
and Clinics Authority. All rights reserved. Produced by the Department of Nursing HF#4243