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In page Aplastic anemia:

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Aplastic anemia must be differentiated from pure red cell aplasia. In aplastic anemia, the patient has pancytopenia (i.e., also leukopenia and thrombocytopenia) resulting in a decrease of all formed elements. In contrast, pure red cell aplasia is characterized by a reduction in red cells only. The diagnosis can only be confirmed with a bone marrow examination.[citation needed]