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Slide 11
The cell indicated by the arrow does not contain inclusions but is bluer than the rest of the cells. Ribonucleic acid, which is found in young red cells, gives it the blue color. The bluish cells are reported as polychromasia. Polychromasia (a mixture of colors - the eosinophilia of hemoglobin and the bluishness of ribonucleic acid) is correlated with the number of reticulocytes. Reticulocytes, however, cannot be seen in Wright's stained smears and must be stained with a vital stain before they become visible. If much polychromasia is present, the observer knows that there is an increased number of reticulocytes.

Course Section: 02. Inclusions Found in Red Blood Cells
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