The white IRIS leukocyte differential analyzer for rapid high-precision differentials based on images of cytoprobe-reacted cells.

Combining unique cytoprobe, rapid hemacyte fractionation, and novel color image analysis, The White IRIS (TWI) extends automated intelligent microscopy to leukocyte differentiation. TWI provides flow cytometry precision and microscopical resolution to review specimens flagged by hematology analyzers with differential capabilities or to complement other analyzers without these capabilities. The system includes compartments for closed sampling, rapid leukocyte-rich plasma preparation, cytoprobe-induced metachromasia, and collection and color analysis of leukocyte images, and presents the results as a single-view 500-cell differential on a 20-in. (50-cm) touch-screen monitor. Method correlations for the five mature cell types averaging r > 0.90 were obtained with a prototype system. Classification of normal and abnormal specimens showed 95% agreement with a reference method without any undetected significant morphologic abnormality. False-positive and false-negative rates of 7.27% and 3.53%, respectively, exceeded performance of current commercial systems. Case studies demonstrate the ease and speed with which unusual pathologies and leukemias can be observed and interpreted.