Escobar HJBH, López MJJD, Ortega PCB, Lagunes MO, Domínguez TE, González OSA, Ramos DAL, Carmona CDA, Croda TMT, Solís PF, Moncayo VV, López HCM, Guadarrama VMA, Viveros GA

Language: Spanish
References: 12
Page: 24-27
PDF size: 210.63 Kb.

ABSTRACT

Introduction. The laboratory determinations are subject to multiple sources of error, which can be avoided, and collectively determine the accuracy of the analysis. The external quality control gives evidence of possible causes of error to establish corrective measures for each laboratory and also know the problems of other laboratories to ensure quality, which helps to identify common problems and causes, thus facilitating the solution them. A few years ago in Mexico, the participation of laboratories in an external evaluation program, occurred on the initiative of the same to ensure the quality of its results, until the day December 4, 1998 is published in the Official Journal of the Federation the Norma Oficial Mexicana (NOM 166-SSA1 1997) “For the organization and operation of clinical laboratories”, which states: “that clinical laboratories must participate in a program of external quality assessment in which to conduct integrated analysis and including the program and evaluation should be credited to each of the tests included in external programs and develop research aimed to solve the problem of those studies where the quality is not satisfactory. “ Objective. Implement a program of external quality assessment in each of the participating laboratories in the areas of Haematology and Coagulation. Material and Methods. Provided to 10 laboratories in the city of Xalapa the following material: a control hemolysate of human origin, homogeneous and sterile negative for human immunodeficiency virus (HIV), hepatitis B and C for the determination of hemoglobin, a control for plasma to determine the parameters of the area of hemostasis, a Pap smear for Wright for the account of erythrocytes, leukocytes, differential leukocyte and morphological review of white series and red series, a smear stained with vital dyes (brilliant cresyl blue or methylene blue) to the reticulocyte count. Provided controls were evaluated by an expert panel comprised of 10 clinical chemistry. Expected values were determined for each analyte for comparison with observed values of each participating laboratory, were prepared averages, proportions and measures of variability (standard deviation, coefficient of variation (CV) and average variance index (PIV). Results. Participants 10 (100%) laboratories of which 3 (30%) operate manually the area of hematology and 6 (60%) detection, while 1 (10%) did not indicate the mode of operation. Regarding the methodology used for the area of hemostasis and coagulation, 60% (6) do automatically, 10% (1) manual and 30% (3) did not indicate which is the methodology they use. Conclusions. There are differences between the results reported by different laboratories participating in the PEEC, this is due to the different methodology used for analysis (manual and automated) in the future, it is intended to discriminate on the methodology for establishing a proper comparison between laboratories. It is important to track the performance of participating laboratories in order to observe the variability in their pursuit of work.

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