ABSTRACT
Objetivo: Comparar as metodologias de impedância e óptica para contagem de eritrócitos (RBC) e dosagem de hemoglobina (HGB) como forma de corrigir a contagem de eritrócitos em casos de pacientes que apresentam índice de concentração de hemoglobina corpus- cular média (CHCM) acima do ponto de corte. Métodos: Para comparar as metodologias, foram utilizadas amostras com CHCM normal e aumentado. Os parâmetros avaliados foram RBC, HGB e CHCM. Resultados: As amostras com valores de CHCM aumentado demonstraram uma correlação significativa entre RBC e HGB, porém o CHCM apresen- tou uma correlação fraca. Observamos que a metodologia por impedância obteve maior sucesso na correção do CHCM quando as amostras apresentavam aglutinação. Conclusão: A metodologia óptica é uma boa alternativa para correção de valores aumentados de CHCM em situações específicas, mas para casos de aglutinação não se mostrou efetiva.
Objetctive: Compare the impedance and optical methodologies for red blood cells (RBC) count and hemoglobin (HGB) measurement as a way to correct the RBC count in cases of patients who have a MCHC index above the cutoff. Methods: To compare the methodologies, samples with normal and augmented MCHC were used. The parameters evaluated were RBC, HGB and MCHC. Results: Samples with increased MCHC values demonstrated a significant correlation between RBC and HGB, but the MCHC showed a weak correlation. We observed that the impedance methodology was more successful in correcting the MCHC when the samples presented agglutination. Conclusion: Optical methodology is a good alternative for correction of increased CHCM values in specific situations, but for cases of agglutination it has not been shown to be effective.
ABSTRACT
ABSTRACT Introduction: The immature platelet and immature reticulocyte fractions represent the ratios of platelets and reticulocytes recently released into the circulation and thus with higher RNA content. They are considered early indicators of bone marrow recovery. Objective: The aim of this study was to determine the reference ranges for the immature platelet and reticulocyte fractions of hematologically normal individuals in a university hospital. Methods: Venous blood samples collected in ethylenediaminetetraacetic acid K3 were analyzed using a Sysmex XE-5000™ analyzer. Individuals with platelet and reticulocyte counts within the reference ranges, and a blood count within the laboratory's screening criteria were included. Individuals with clinical conditions that could affect hematological results were excluded. The immature platelet fraction, high, medium and low fluorescence reticulocyte fractions and reticulocyte hemoglobin equivalent were evaluated. The reference ranges were determined according to the recommendations of the International Federation of Clinical Chemistry. Results: One hundred and thirty-two outpatients were evaluated. The mean age was 44 years (range: 13-80 years), 72 (54.5%) were women treated in a university hospital. The mean platelet count was 250.8 × 109/L and the mean reticulocyte count was 0.052 × 109/L. The following reference ranges were obtained: immature reticulocyte fraction 1.6-12.1%, the high, medium and low fluorescence reticulocyte fractions were 0.0-1.7%, 1.6-11.0% and 87.9-98.4%, respectively, the reticulocyte hemoglobin equivalent was 30.0-37.6% and immature platelet fraction was 0.8-5.6%. There was a statistically significant difference (p-value = 0.006) between genders in respect to the immature platelet fraction with 0.8-4.7% for females and 0.7-6.1% for males. The immature reticulocyte fraction was directly correlated with the reticulocyte count. Conclusion: Determining the reference range is critical to the introduction of a new parameter. The reference ranges obtained herein corroborate those reported in previous publications and will contribute to the clinical and laboratory application of the indices.