Describe the antibody identification process using panel cells.

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The process relies on testing the patient’s serum against a panel of red blood cells, each with a known set of antigens. By observing which panel cells the serum reacts with and how strongly (the pattern of reactivity), you can deduce which specific antibody is present in the patient. Each panel cell’s antigen profile serves as clues: if a cell that carries a particular antigen reacts and a closely related cell lacking that antigen does not, that points to antibodies against that antigen. Once the antibody is identified, donor units can be matched to avoid transfusing units that carry the corresponding antigen, preventing a hemolytic reaction. This panel-based approach is the standard method for antibody identification, rather than sequencing methods, and is only pursued when a screen or preliminary testing indicates an antibody is present. If the initial screen is negative, there’s no antibody to identify, so this step isn’t needed.