Rapid Detection of <i>Plasmodium vivax</i> by the Hematology Analyzer for Population Screening

Abstract

In India, where malaria is endemic, the prompt and accurate detection of infections is crucial for disease management and vector control. Our study aimed to evaluate the “iRBC” flag, a novel parameter developed for routine hematology analyzers, for its sensitivity and specificity in detecting Plasmodium vivax (P. vivax) infections. We used residual blood samples from patients with suspected malaria and compared the iRBC flag results with microscopy, which serves as the gold standard. Additionally, we compared the results with rapid immuno-chromatographic tests (RDTs) commonly used in the field. Our study included 575 samples, of which 187 were positive for P. vivax. The iRBC flag demonstrated a high sensitivity of 88.7% and 86.1% on the XN and XN-L hematology analyzers, respectively, and a clinical specificity of 100% on both analyzers. Furthermore, the scattergram derived from each positive dataset exhibited distinct patterns, which facilitated rapid confirmation by laboratory specialists. Notably, the iRBC flag remained effective even in the presence of interfering conditions. Overall, our results indicate that the iRBC flag is a reliable and rapid screening tool for identifying P. vivax in routine blood testing. Our findings have significant implications for malaria detection and control in endemic regions like India.

Keywords

• malaria
• Sysmex XN
• Sysmex XN-L
• iRBC flag
• <i>P. vivax</i>