Establishing reference ranges of the complete blood count (CBC), reticulocyte hemoglobin content (Ret-He), immature reticulocyte fraction (IRF), and reticulocyte production index (RPI) helps diagnose a disease related to the changes in erythrocyte indices, white blood count, platelets, and reticulocytes, especially in babies. Therefore, the study aims to establish a reference range for CBC and reticulocyte parameters in healthy babies aged 1–4 months. The study design was a cross-sectional study with descriptive analysis of CBC and reticulocyte in babies aged 1–4 months. Three hundred forty-eight babies met the inclusion criteria. This study recruited 89 babies aged 1 month, 87 babies aged 2 months, 86 babies aged 3 months, and 86 babies aged 4 months. The P5-P95 reference range of healthy babies for hemoglobin (Hb) aged 1 month, 2 months, 3 months, and 4 months was 9.95 to 15.45 g/dL, 9.74 to 13.42 g/dL, 9.51 to 12.40 g/dL, and 10.04 to 13.10 g/dL respectively. The P3-P97 reference range of healthy babies for Hb aged 1 month, 2 months, 3 months, and 4 months was 9.60 to 15.90 g/dL, 9.46 to 13.97 g/dL, 9.26 to 12.82 g/dL, and 10.00 to 13.33 g/dL respectively. This study also defined reference ranges for CBC, Ret-He, IRF, and RPI. The reference range of CBC, Ret-He, IRF, and RPI for healthy babies aged 1–4 months in this study can be used as a benchmark.

Introduction: Inflammation plays a vital role in the pathophysiology of COVID-19. Complete blood count (CBC) is a routine test performed on patients. It provides information regarding the inflammatory process and can be used as a predictor of outcome. This study aimed to explore the correlation between different complete blood count (CBC)-derived inflammation indexes at hospital admission, such as neutrophil to lymphocyte ratio (NLR), derived NLR (dNLR), platelet to lymphocyte ratio (PLR), monocyte to lymphocyte ratio (MLR), neutrophil to lymphocyte × platelet ratio (NLPR), aggregate index of systemic inflammation (AISI), systemic inflammation response index (SIRI), and systemic immune-inflammation index (SII), to in-hospital mortality in confirmed COVID-19 patients. Methodology: A retrospective observational study was performed at Ulin Referral Hospital of South Kalimantan with 445 COVID-19 patients from April to November 2020. The patients were divided into two groups, non-survivor and survivor. A receiver operating characteristic (ROC) curve was used to determine the cut-off values. Bivariate analysis was performed using the Chi Square test, the risk ratio was calculated, and logistics regression was determined. Results: Increase of NLR, dNLR, PLR, MLR, NLPR, MLR, AISI, SIRI, and SII from cut-off values were significantly correlated with patient survival outcome. The cut off values were 6.90, 4.10, 295, 0.42, 0.037, 1,422, 1.80, and 2,504 respectively. NLPR was dominant in predicting in-hospital mortality (OR: 6.668, p = 0.000) with a 28.1% sensitivity and 95.9% specificity. Conclusions: CBC-derived inflammation indexes were associated with the survival outcome of confirmed COVID-19 patients and NLPR was a dominant variable.

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