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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.
Urine Specimen Collection. Proper collection of urine specimens is important to avoid contamination, or deterioration of urine constituents. Ensure the urine collection container is clean and the container manufacturer has guaranteed that will not leach interfering substances into the specimen.