False negative results may occur with both the direct and indirect antiglobulin tests as a result of

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False negative results may occur with both the direct and indirect antiglobulin tests as a result of all of the following except:

Please select the single best answer

	Undercentrifugation
	Delay in adding antiglobulin reagent
	Failure to adequately wash cells
	Agglutination of red cells prior to addition of antiglobulin reagent