Diagnostic accuracy of buffy coat culture compared to total blood culture in late-onset sepsis of the newborn

Objectives: To study the potential of buffy coat culture as a diagnostic tool for neonatal late-onset sepsis. Methods: This was a study of diagnostic accuracy in newborn infants born at 28-41 weeks of gestation, weighing >800. g, with ≥8 points on the NOSEP-1 scale. Paired samples for total blood culture (TBC) and buffy coat culture were drawn. We established the positivity rate, sensitivity, specificity, predictive values, and likelihood ratios, and compared time to positivity and contamination rates. Results: Fifty-two newborns were included in the study. Twenty-one TBC and 22 buffy coat cultures were positive. The positivity rate for TBC was 40.4% and for buffy coat culture was 42.3% (p=. not significant). Three TBC were positive with negative buffy coat culture. Four buffy coat cultures were positive with negative TBC; Kappa agreement was 0.723, p