When testing for weak D using an indirect antigblobulin test (IAT),cells that are already coated with _____ can give a false-positive reaction in the antiglobulin phase.

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When testing for weak D using the IAT method, cells that are already coated with IgG (usually due to previous exposure to the D antigen) can give a false-positive reaction in the antiglobulin phase. This is why it is important to perform a positive control using D-positive cells to confirm the specificity of the reaction.

When Testing for Weak D Using an Indirect Antigblobulin Test