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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 for a urinalysis can be collected at any time. The first morning sample is considered the most valuable because it is more concentrated and more likely to yield abnormalities if present. It is important to clean the genitalia before collecting urine.Bacteria and cells from the surrounding skin can contaminate the sample and interfere with the interpretation of test results. With women, menstrual blood and vaginal secretions can also be a source of contamination.rine for a urinalysis can be collected at any time. The first morning sample is considered the most valuable because it is more concentrated and more likely to yield abnormalities if present. It is important to clean the genitalia before collecting urine.