A method for classifying leukocytes with a flow cytometer by use of optical measurements on fluorochrome-stained blood cells. The method comprises the steps of lysing erythrocytes in a blood sample, selectively staining eosinophils and basophils, permitting stained sample to flow through a flow cytometer,...http://www.google.de/patents/US5296378?utm_source=gb-gplus-sharePatent US5296378 - Method for classifying leukocytes by flow cytometry