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The hemogram and hemogram-derivative ratios (HDRs) are becoming markers of the severity and mortality of COVID-19. We evaluated the hemograms and serial weekly HDRs [neutrophil-lymphocyte ratio (NLR), monocyte-lymphocyte ratio (MLR), platelet-lymphocyte ratio (PLR), neutrophil-platelet ratio (NPR) and systemic immune-inflammatory index (SII)] in the survivors and non-survivors of COVID-19.We retrospectively reviewed the medical notes and serial hemograms of real-time reverse-transcription polymerase chain reaction (RT-PCR)-confirmed COVID-19 adults hospitalized from April 2020 to March 2021 from the time of diagnosis to the 3Of the 320 adults, 257 (80.3%) were survivors and had a lower mean age than the non-survivors (57.73This study shows that serial lymphocyte and neutrophil counts, NLR, PLR, MLR, NPR and SII could serve as good and easily accessible markers of severity and predictors of outcomes in COVID-19 patients and should be used for the monitoring of treatment response.

Background: Brazil became the South American epicenter for coronavirus disease (COVID-19) soon after the first case was diagnosed in February 2020 with the highest infection rate occurring in the state of Sao Paulo. COVID-19 is characterized by marked thrombo-inflammation mechanisms, and neutrophil-lymphocyte ratio (NLR) among many clinical and laboratory data, is becoming an inflammatory marker of severity and mortality of COVID-19. We evaluated the serial weekly lymphocyte ratios, which are easily derivable from the routine blood counts, in the survivors and non-survivors of COVID-19 at the Clinical Hospital of University of Campinas (UNICAMP), Campinas, Sao Paulo, Brazil, from time of diagnosis to the 3 rd week of care. This hospital is one of the referral centers for COVID-19 patients in this state. Methods: In this retrospective study, we reviewed the medical notes of 320 adults hospitalized patients with PCR-confirmed COVID-19 at the Clinical Hospital of UNICAMP, from March 2020 to March 2021. The serial weekly hematological parameters (analyzed using automated counter - XN 9000™, Sysmex, Japan) from the time of diagnosis were analyzed and lymphocytes ratios (neutrophil-lymphocyte, NLR, platelet-lymphocyte PLR, and monocyte-lymphocyte MLR) were calculated. The survivors (n=257) were those who recovered from the disease and were discharged from the hospital, while the non-survivors (n=63) were those who died in the course of treatment. Statistical analyses were performed using SPSS (version 22). Unpaired data of Survivors and Non-survivors with COVID-19 were compared using Mann-Whitney tests. Repeated measures were compared within and between groups using univariate and multivariate tests in general linear models. All results were considered significant if p Results: Of the 320 patients, 257 (80.3%) were survivors and had lower mean age than the non-survivors (57.73 vs 64.65 years, p We used general linear models for repeated measures and corrected for the patients who did not stay long enough to have a complete series of blood counts, Figure 1 A-G. Multivariate tests between the survivor and non-survivor groups showed significant variations with serial weekly lymphocyte count (p Conclusions: The non-survivors were older and their NLR and MLR tend to increase from the time of diagnosis while their PLR tend to decrease after the 2 nd week post-COVID-19 diagnosis and treatment. On the other hand, all three ratios significantly decrease in the survivors. While neutrophilia and lymphopenia improved in the survivor, they worsen in non-survivors. These cells may have contributed towards the recovery by ameliorating the inflammatory response in survivors, and death by worsening the response in non-survivors of COVID-19. This study shows that serial lymphocyte count, neutrophil count, NLR, PLR, and MLR could serve as good and easily accessible markers of outcomes in patients with COVID-19 and could be used for monitoring of response to treatment. Figure 1 Figure 1. Disclosures Costa: Novartis: Consultancy.