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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.
THE CLOTTING PROCESS. â¢ Clotting begins when a blood sample is collected from a patient into. a red-top tube or serum separator tube (SST). â¢ A specimen collected in a blood collection tube with clot activator. should be inverted five times to facilitate the clotting process. â¢ Allow the specimen(s) to sit at ambient temperature until a clot has.