👉 A plethysmogram is a medical test used to determine if there is any blockage in the blood vessels. It involves taking a small sample of blood and placing it on a special device called a catheter, which is then passed through the body to examine the flow of blood. If the blood flows normally, the result of the test will be normal. If the blood does not flow normally, there may be a blockage in the blood vessels that needs to be addressed.
