PEIR Digital Library

Welcome to the Pathology Education Informational Resource (PEIR) Digital Library, a multidisciplinary public access image database for use in medical education.

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OTHER: HEMATOLOGIC: BLOOD: Blood tests: Sickle cell preparation: Metabisulfite test for sickle hemoglobin.; Metabisulfite is added to a tube of patients blood. Screen for sickle hemoglobin causes red cells to sickle by removing oxygen. Positive turbidity is gross change for presence of Hb S; with turbidity the line behind the tube disappears.