HEMATOLOGICAL REFERENCE RANGES FOR HEALTHY ADULTS IN THE NORTHWEST REGION OF CAMEROON / GAMMES DE RÉFÉRENCE HÉMATOLOGIQUE POUR LA SANTÉ ADULTES DANS LA RÉGION NORD-OUEST DU CAMEROUN

Mercy A. Manjong-Kofete, Wilfred F. Mbacham

Abstract


The interpretation of laboratory test results requires reference or cutoff values. An improved diagnosis with accurate, reliable laboratory reference ranges saves valuable healthcare resources essential for effective clinical evaluation and monitoring. This benefit provides improved cost containment by eliminating unnecessary testing, treatment changes, and use of other healthcare resources during the episode of care. Based on the above fact, this study was designed to establish reference ranges for hematological parameters in apparently healthy voluntary non-remunerated blood donors. The study was a hospital based cross-sectional experimental study conducted between February and October 2020. Blood samples were taken from 356 healthy adults (18 to 60 years) 211 (59.3%) males and 145 (40.7%) females and routine hematology analysis performed. Patients were assessed as healthy on the basis of a medical history and medical examinations. Venous blood from the antecubital fossa was collected in 2-3mL of K- ethylenediamine tetra acetic acid (EDTA) for complete blood counts. A total of nineteen hematological parameters were tested in this study and showed significant differences (p<0.001) among males and females with the former showing higher CBC values, except WBC, GRAN# and platelet. More than 10% of the female population presented results that were out of that of the accompanying manual of the hematology analyzer used in the study. The reference range for LYM % for the female was above the upper limit of the manufacturers’ manual reference and for GRAN% in the males was below the lower limit of the accompanying manual of the hematology analyzer. Several differences were also observed when compared to previously established values from Yaounde (Cameroon), most notably in platelets. Our findings for CBC parameters, are in general agreement with previously published data from more limited trials undertaken in other African countries. In spite of the uncontrolled factors influencing hematological values, this study permitted to establish new hematological reference values for use in the North West region of Cameroon. In the absence of previously detailed and more comprehensive investigated hematological reference values for the region we offered to use these results for clinical management of patients from this region and interpretations of laboratory data.

L'interprétation des résultats des tests de laboratoire nécessite des valeurs de référence ou de coupure. Un diagnostic amélioré avec des plages de référence de laboratoire précises et fiables permet d'économiser de précieuses ressources de santé essentielles pour une évaluation et un suivi cliniques efficaces. Cet avantage permet une meilleure maîtrise des coûts en éliminant les tests inutiles, les changements de traitement et l'utilisation d'autres ressources de soins de santé pendant l'épisode de soins. Sur la base de ce qui précède, cette étude a été conçue pour établir des plages de référence pour les paramètres hématologiques chez des donneurs de sang volontaires non rémunérés apparemment en bonne santé. L'étude était une étude expérimentale transversale en milieu hospitalier menée entre février et octobre 2020. Des échantillons de sang ont été prélevés sur 356 adultes en bonne santé (18 à 60 ans) 211 (59,3%) hommes et 145 (40,7%) femmes et une analyse hématologique de routine a été réalisée. Les patients ont été jugés sains sur la base des antécédents médicaux et des examens médicaux. Le sang veineux de la fosse antécubitale a été collecté dans 2-3 ml d'acide K-éthylènediamine tétra acétique (EDTA) pour une numération globulaire complète. Un total de dix-neuf paramètres hématologiques ont été testés dans cette étude et ont montré des différences significatives (p <0,001) entre les hommes et les femmes, le premier montrant des valeurs de FSC plus élevées, sauf globules blancs, GRAN # et plaquettes. Plus de 10% de la population féminine a présenté des résultats différents de ceux du manuel d'accompagnement de l'analyseur d'hématologie utilisé dans l'étude. La plage de référence pour LYM% pour la femelle était au-dessus de la limite supérieure de la référence manuelle du fabricant et pour GRAN% chez les mâles était inférieure à la limite inférieure du manuel d'accompagnement de l'analyseur d'hématologie. Plusieurs différences ont également été observées par rapport aux valeurs précédemment établies à Yaoundé (Cameroun), notamment dans les plaquettes. Nos résultats pour les paramètres du FSC, sont en accord général avec les données publiées antérieurement à partir d'essais plus limités entrepris dans d'autres pays africains. Malgré les facteurs incontrôlés influençant les valeurs hématologiques, cette étude a permis d'établir de nouvelles valeurs hématologiques de référence à utiliser dans la région du Nord-Ouest du Cameroun. En l'absence de valeurs de référence hématologiques étudiées précédemment détaillées et plus complètes pour la région, nous avons proposé d'utiliser ces résultats pour la prise en charge clinique des patients de cette région et l'interprétation des données de laboratoire.

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Keywords


complete blood count, hematology, reference range, North West region, Cameroon / formule sanguine complète (FSC), hématologie, gamme de référence, région du Nord-Ouest, Cameroun

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DOI: http://dx.doi.org/10.46827/ejphs.v4i1.85

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