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The present work evaluated the possible alterations in different hemogram parameters as: total erythrocyte count, hematocrit, leukocyte, and platelet count, against different times of sample storage at refrigerated and room temperature towards the effects of anticoagulants that can affect the variation of laboratory results. Objective: Compare variations in automated hemogram analysis, with blood collected in tubes containing dipotassium ethylenediaminetetraacetic acid (K 2 EDTA) and tripotassium ethylenediaminetetraacetic acid (K 3 EDTA). Material and methods: A comparative study was carried out on differential leukocyte count and absolute leukocyte count, hemoglobin determination and red blood cell count and platelet count. Therefore, it researches the anticoagulant that brings less interferences in hemogram analysis according to storage, at temperatures from 2°C to 8°C and 25°C (room temperature), and the time window between collection and analysis (4, 6, and 8 hours). These determinations were carried out after homogenization from five to eight inversions using the automated device Sysmex XN-1000. Eighteen biological samples of venous blood were collected, used as control, from patients aged 18 and over that did not have any hematologic disease. Results: The results were evaluated through descriptive statistical analysis, and comparison of mean values through the analysis of variance (Anova). In accordance with the results presented, there were not changes in the parameters by refrigerating the sample in the period of 8 hours, except for the platelet count, presenting oscillations when stored under refrigeration from 2°C to 8°C. Conclusion: At room temperature, the parameters mean corpuscular volume (MCV), mean corpuscular hemoglobin concentration (MCHC), and hematocrit presented significant statistical differences.

Interference of blood storage containing K2EDTA and K3EDTA anticoagulants in the automated analysis of the hemogram