What is the purpose of washing red blood cells before testing?

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Multiple Choice

What is the purpose of washing red blood cells before testing?

Washing red blood cells before testing is done to remove unbound serum components from the cell suspension. This step prevents soluble antibodies, plasma proteins, and other substances in the serum from interfering with the assay, so any agglutination or detection you observe reflects specific antigen–antibody interactions that are actually bound to the cells. If you skip the wash, free antibodies can cause nonspecific reactions or background noise, leading to false positives or unclear results. Lysis would ruin the cells, washing does not purposefully increase antibody binding, and ABO typing isn’t accurately validated by leaving serum components in place.

Washing red blood cells before testing is done to remove unbound serum components from the cell suspension. This step prevents soluble antibodies, plasma proteins, and other substances in the serum from interfering with the assay, so any agglutination or detection you observe reflects specific antigen–antibody interactions that are actually bound to the cells. If you skip the wash, free antibodies can cause nonspecific reactions or background noise, leading to false positives or unclear results. Lysis would ruin the cells, washing does not purposefully increase antibody binding, and ABO typing isn’t accurately validated by leaving serum components in place.

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