PERFORMANCE EVALUATION OF NUCLEATED RED BLOOD CELL (NRBC) COUNT USING A FULLY AUTOMATED HAEMATOLOGY ANALYZER VERSUS MANUAL COUNTING

Objective: To evaluate the performance of Nucleated RBC (NRBC) Count using a fully automated haematology analyzer versus manual counting. Study Design: Cross-Sectional Study. Place and Duration of Study: Department of Hematology, Armed Forces Institute of Pathology, from Sep 2019-Jun 2020. Methodology: Routine fresh whole blood samples were run on Sysmex XN-3000 automated haematology analyzer and 384 samples with results of ≥0.1% Nucleated red blood cells were included in this study. Manual NRBC counting was carried out twice on Leishman-stained peripheral blood smears from all 384 samples. Comparison between manual and automated nucleated red blood cell counting methods was statistically analyzed through linear regression analysis & coefficient correlation. The degree of agreement between two methods was analyzed through Bland-Altman plot. Finally, concordance between the two methods was also analyzed at 5 different ranges of nucleated red blood cells. Results: Linear regression analysis revealed a (r2) value of 0.97. Regression equation was calculated as XN = 0.76MC ± 1.28, with 95% limits of agreement between ± 40.42% and -24.47%. A mean bias of 7.97% was demonstrated through Bland-Altman plot. Concordance analysis revealed a concordance rate of 93.74% (360/384). Nucleated red blood cell counting between two methods were more concordant when nucleated red blood cell counts were <200%. Conclusion: Nucleated red blood cells counting by XN-3000 automated hematology analyzer is statistically comparable to manual nucleated red blood cell counting. We suggest that automated counting can be adopted in routine hematology laboratory as a replacement of manual NRBC counting.

Significance of cord blood nucleated red blood cell count in pregnancies complicated by preeclampsia as a marker for intra uterine growth restriction

Background: Preeclampsia is a pregnancy-specific syndrome of reduced organ perfusion secondary to vasospasm and endothelial activation which is typically characterized by hypertension, proteinuria, edema and fetal compromise which is a leading cause of intra uterine growth restriction (IUGR). Elevated nucleated red blood cell (NRBC) count is introduced as a potential marker of intra-uterine growth restriction (IUGR) hence determination of NRBC counts is essentially helpful in predicting short term neurodevelopment outcome. Objective of the study Elevated nucleated red blood cell (NRBC) count is introduced as a potential marker of intra-uterine growth restriction (IUGR) in term babies born to preeclamptic mothersMethods: A cross sectional study conducted in a tertiary care hospital to evaluate the significance of cord blood NRBC count in term neonates born with pregnancy complicated by preeclampsia. It included 60 healthy mothers (control group) and 60 mothers with PIH. Collected data was analysed with SPSS software.Results: The nucleated red blood cell in cord blood of newborns in preeclampsia group was significantly higher than in the control group (p value 0.013). IUGR is significantly higher in PIH group (p value 0.008).Conclusions: From the observed data it is concluded that IUGR is an important cause of perinatal morbidity and mortality. The commonest maternal cause for IUGR was pregnancy induced hypertension. The other contributing factors were anemia, lack of awareness (unregistered, unbooked cases) among mothers, poor maternal nutrition and poor weight gain during pregnancy. Infants of preeclamptic women have higher nucleated red blood cell count at birth than control which means that preeclampsia may produce an erythropoietic response in the fetus. The positive correlation between cord nucleated red blood cell counts in preeclamptic patients and control group indicates that may be the hypoperfused placenta plays a role in this correlation.