IgG coated red cells are added to negative antiglobulin tests to detect which of the following sour

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IgG coated red cells are added to negative antiglobulin tests to detect which of the following sources of error:

Please select the single best answer

	Delay in washing procedure
	Improper resuspension of the red cells
	Failure to add Coombs serum
	Improper incubation time or temperature