Importance of the reticulocyte hemoglobin equivalent in the exclusion of latent iron deficiency.

BACKGROUND: Iron deficiency is an underdiagnosed public health problem, especially in developing countries, that can conceal serious underlying illnesses. Early diagnosis and treatment of latent iron deficiency (LID) is crucial. Reticulocyte hemoglobin equivalent (RET-He), was reported to be a cost-effective tool that reflects the iron availability at erythropoiesis. The aims of this study were to evaluate the RET-He in the exclusion of LID. METHODS: Transversal study was carried out in the laboratory of clinical biology of Ben Arous regional hospital, it included volunteers in apparently good health. We performed a complete blood count and a serum ferritin assay. Participants with normal hemoglobin were divided into two groups: Control group G1: normal ferritin (≥ 15 ng/mL)/LID group G2: low ferritin (< 15 ng/mL). We compared the blood count parameters of the two groups. RESULTS: We selected 108 participants (G1: 88 (81.5%), G2: 20 (18.5%)), mean age = 36 years, gender-ratio = 0.92. We noted, in G2, significantly lower rates for hemoglobin Hb (p < 0.001), hematocrit (p < 0.001), mean corpuscular hemoglobin MCH (p = 0.026), reticulocyte count (p = 0.039) and RET-He (p < 0.001) and significantly higher rate for RDW/CV (p = 0.009). RET-He averages were 29.1 pg in G2 and 31.1pg in G1. In multivariate analysis, only RET-He showed a significant difference between the two groups. Area under the curve was 0.872, the cutoff = 30.9 (sensitivity 100%, specificity 61%, PPV 37%, NPV 100%). CONCLUSION: RET-He is an accessible and affordable parameter of the iron status, with an excellent NPV. It would be interesting to evaluate our results on a larger sample to define reference values in our population.

Prognostic Value of Routine Blood Parameters in Intensive Care Unit COVID-19 Patients.

Introduction: Laboratory medicine has an important role in the management of COVID-19. The aim of this study was to analyze routinely available blood parameters in intensive care unit COVID-19 patients and to evaluate their prognostic value. Patients and methods: This is a retrospective, observational, single-center study including consecutive severe COVID-19 patients who were admitted into the intensive care unit of Ben Arous Regional Hospital in Tunisia from 28 September 2020 to 31 May 2021. The end point of the study was either hospital discharge or in-hospital death. We defined two groups based on the outcome: survivors (Group 1) and non-survivors (Group 2). Demographical, clinical, and laboratory data on admission were collected and compared between the two groups. Univariate and multivariate logistic regression analysis were performed to determine the predictive factors for COVID-19 disease mortality. Results: A total of 150 patients were enrolled. Eighty patients (53.3%) died and 70 (46.7%) survived during the study period. Based on statistical analysis, median age, Simplified Acute Physiology Score (SAPS II) with the serum levels of urea, creatinine, total lactate dehydrogenase (LDH), creatine kinase, procalcitonin and hs-troponin I were significantly higher in non-survivors compared to survivors. On multivariate analysis, LDH activity ≥ 484 U/L (OR=17.979; 95%CI [1.119-2.040]; p = 0.09) and hs-troponin I ≥ 6.55 ng/L (OR=12.492; 95%CI [1.691-92.268]; p = 0.013) independently predicted COVID-19 related mortality. Conclusion: Total LDH and hs-troponin I were independent predictors of death. However, further clinical investigations with even larger number of patients are needed for the evaluation of other laboratory biomarkers which could aid in assessing the prediction of mortality.