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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 fixed anti-hCG is complex with an enzyme or other color producing molecule. The result will be the production of a visible marker. Controls must be routinely tested on the kits to verify the validity of patient results. Sample Requirements Random urine specimen is appropriate for hCG testing, but the first morning urine is optimal because it generally contains the highest concentration of hCG. Urine specimens should be collected in any clean, dry, plastic container. NOTE: Urine specimen should be stored in the smallest possible plastic container. Large containers (especially glass) are to be avoided because hCG sticks to the surface of containers.