Renal perfusion is a term used to describe blood flow to the kidneys and is commonly assessed with a test called renal scintigraphy. This test helps determine how well blood is delivered to the kidneys and how well the kidneys function, according to Johns Hopkins University.Know More
In the case of renal perfusion assessment, a renal blood flow scan can help find blockages or narrowing of blood flow to the kidneys. This is an important test in cases where a physician wants to rule out renovascular hypertension as a source of disease or if renal transplant rejection is suspected, explains Johns Hopkins University.
The procedure begins by injecting a small amount of radioactive dye into the blood stream. The dye usually consists of iodine or technetium and is processed by the kidneys. Once there, the dye emits radiation, which is picked up by a scanner. The scanner then translates the information into an image, which a physician interprets, according to Johns Hopkins University.
The risks from the procedure are low because of the small amount of dye injected into the patient. Patients who are allergic to the dye or any of its components need to tell their physicians. Women who are pregnant should avoid being exposed to the dye because it can cause harm to the fetus, explains Johns Hopkins University.Learn more about Diagnostics & Imaging
Doctors use the images from a nuclear stress test to measure blood flow to a patient's heart before and after exercise, and in some cases before and after taking medications, notes Mayo Clinic. They conduct the test by injecting a radioactive dye into the patient's blood stream, then studying images of the dye's flow through the heart and heart muscles.Full Answer >
A cardiac stress test evaluates the amount of workload that the heart can take before it develops a problem with rhythm or blood flow, explains WebMD. The different types of tests include an exercise stress test, a dobutamine or adenosine stress test, a stress echocardiogram and a nuclear stress test.Full Answer >
A carotid Doppler test is a vascular ultrasound performed to evaluate blood flow through the carotid arteries, which are the main arteries that supply blood to the brain, according to Johns Hopkins Medicine. The test is usually performed if a doctor suspects carotid artery blockage or narrowing.Full Answer >
A chemical stress test uses a medication to increase blood flow to the heart in patients unable to exercise, states the American Heart Association. Myocardial imaging involves injecting a radioactive substance into the blood and obtaining images with a special camera to see the blood flow to the heart muscle.Full Answer >