A convalescent blood specimen should be collected ____ after the onset of symptoms.

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In obtaining specimens for serologic testing,it is important to consider the phase of the disease and the condition of the patient at the time of the specimen collection.This is especially important in assays for diagnosis of infectious diseases.If serum is being tested for antibody levels for a specific infectious organism,generally the blood should be drawn during the acute phase of the illness-when the disease is first discovered or suspected-and another sample drawn during the convalescent phase,usually about 2 weeks later.Accordingly,these samples are called acute and convalescent serum.

A Convalescent Blood Specimen Should Be Collected ____ After the Onset