Mean Platelet Volume and Mean Platelet Volume/Platelet Count Ratio Are Predictors of Late-Onset Sepsis in Preterm Infants: A Case-Control Study.

Objective: Our aim was to assess mean platelet volume (MPV) and mean platelet volume to platelet count ratio (MPR) in the setting of late-onset sepsis (LOS) and their association with the type of bacteria causing LOS. Study design: The MPV and MPR levels were obtained at the onset of LOS and then assessed in intra/inter group analyses in preterm infants. Results: Overall, 136 preterm infants were enrolled. The MPV and MPR levels were higher during a LOS event ( P  < 0.001). A MPV cutoff of >9.2 was related with a sensitivity of 63% and a specificity of 73% for predicting LOS ( P  < 0.001). A MPR cutoff of >0.15 was related with a sensitivity of 88% and a specificity of 63% for predicting gram negative LOS ( P  < 0.001). Conclusion: Elevated MPV values and MPR ratios may be helpful in assessing LOS.