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Anaphylactic reactions are excluded by the presence of red plasma or urine, discordant pretransfusion and posttransfusion ABO blood types, or a positive direct antiglobulin (Coombs) test result. Demonstration of anti-IgA in a pretransfusion sample of the recipient's serum or plasma establishes the diagnosis.
Why It Is Done. A kidney scan is done to: 1  Check the blood flow through the kidneys. 2  Abnormal flow may mean narrowed renal arteries that can cause a type of high blood pressure called renovascular hypertension. 3  See how a transplanted kidney is working.uring a scan to look at kidney function, a radioactive tracer substance is injected into a vein in the arm and then travels through the bloodstream to the kidneys. The tracer flows through the blood vessels in the kidneys and then is excreted into the urine.