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PCV) Determination Audu I www.symbiosisonline.org Symbiosis www.symbiosisonlinepublishing.com Case Report International Journal of Hematology and Blood Disorders Open Access Analytical Comparison between Microhematocrit and Automated Methods for Packed Cell Volume (PCV) Determination Audu I. Stephen1*, Simon T. Ubwa1, Ogbene G. Igbum1, Stephen S. Hati2, NwannadiI.Alex3 1Department of Chemistry, Benue State University, Makurdi, Nigeria 2RR&P, Nisa Premier Hospital, Abuja, Nigeria 3Department of Haematology, Benue State University Teaching Hospital, Makurdi, Nigeria Received: 6th June, 2017; Accepted: 26th June, 2017; Published: 10th July, 2017 *Corresponding author: Audu I. Stephen, Department of Chemistry, Benue State University, Makurdi, Nigeria.E-mail: [email protected] Abstract Introduction Analytical methods comparison for the determination of packed The packed cell volume (PCV) test are normally done to cell volume(PCV) are essential in clinical laboratory practice as it diagnose or evaluate anaemia (decrease of red blood cells), improves the quality of health care through accurate and reliable polycythaemia (increased in red blood cells). Conditions that clinical decision making from diagnostic results of suitable alternatives. can lead to low PCV include, bleeding, kidney disease (a healthy Comparison is necessary because each method is expected to serve kidney secretes a hormone erythropoietin which stimulates as a quality control measure for the other. This study was done to red blood cell production in the bone marrow) and heamolysis assess the analytical performance between the Microhematocrit and automated methods for PCV determination. In this study carried (where the red blood cells are being destroyed prematurely either out at the heamatology laboratory of the Benue State University due to attack by the body immune system or organ damage) [1]. Teaching Hospital, Makurdi, Nigeria, the Microhematocrit method Hematocrit is the percentage of blood that is comprised of red determined by using the HC 702, (ApelCo. Ltd, Korea) was compared blood cell. This is often referred to as packed cell volume (PCV) with the Automated hematology Analyzer method (KX-21N sysmex, or erythrocyte volume fraction. It is considered as an integral USA) using paired data of blood samples analyzed respectively from part of a person’s complete blood count, along with hemoglobin 206 patients in the hospital. Data analysis was performed using Analyse-it ® Version 4.6 method validation software. The results concentration, white blood cell count and platelet counts [2,3]. showed that similar overall mean values of PCV were obtained by both The measurement of the packed cell volume (PCV) is useful microhematocrit (34.5±7.3%) and automated (34.3±6.8%) methods. in any hematologic workup and is a main tool in the quality control programs in the haematology laboratory [4]. Incorrectly between the overall measurements by both methods. reported microhematocrit result may bias clinical decision in Result of t-test analysis was not statistically significant (p= 0.135) follow up of patients, blood transfusion decision, and in diagnosis between microhematocrit and Automated measurements of PCV. of hematologic diseases such as severe anemia. In spite of its Pearson’s analysis revealed a high correlation value (r = 0.917) from the standpoint of its reliability than have the measurements Passing-Bablok fit of the regression line provided the equation: significance it has received far less consideration in research Automated = 1.373 + 0.9692 microhematocrit; and slope value of hemoglobin or red cell counts [3,4]. high(0.969, level 95% ofCI: agreement0.9400 to 1.008)between supports the microhematocrit the high correlation and In Nigeria, hematocrit is a common complete blood coefficient. The Bland-Altman plot of mean difference expresses Automated measurements. The average error in evaluating PCV count parameter routinely used by clinicians. In most rural part with microhematocrit compared with evaluation with Automated of the country where the automated analysers are not available, (calculated by Automated - microhematocrit) ranged between 16.2% the microhematocrit method is used to determine PCV in clients. despite the sophistication of present day auto analyzers, there is need Haematology autoanalyzers provide quick and accurate results in toand depend 59.3% (95%on manual CI = 0.9400% techniques to 1.008%).for primary It can calibration, be concluded and thatthe most situations. However, auto analyzers are prone to errors as platelet aggregates or hypolobulated neutrophil may give rise to automated haematology analyzer. false high PCV [5,6]. study confirm that the microhematocrit readings are as reliable as the Keywords: Materials and Methods Microhematocrit; Packed cell Volume; Automated Study Setting and Design method; Anaemia TThe study was carried out at the haematology laboratory of the Benue State University Teaching hospital, Makurdi, Nigeria. Symbiosis Group *Corresponding author email: [email protected]@gmail.com Analytical Comparison between Microhematocrit and Automated Methods Copyright: Warfarin related nephropathy: a case report from a tertiary © 2017 Audu I. Stephen,et.al.Copyright: hospitalfor Packed of northCell Volume India and(PCV) review Determination of literature © 2016 Pannu This prospective study was conducted from November 2015 to Statistical analysis September 2016. A total of 206 patients were randomly sampled Data collected were collated on Microsoft Excel spread sheet at the Benue State University Teaching Hospital, Makurdi during and analysis was done using Analyse-it ® Version 4.6, (Analyse- the study period. The study was approved by the Health Research and Ethics Committee of the Hospital. Determination of Packed Cell Volume (PCV) industry-recognisedit Leeds, UK) [9] A protocols,p-value of enablesless than the 0.05 analyst (p < to 0.05) validate, was verifyconsidered and demonstratesignificant.The analytical software accuracy, supports precision, the latest CLSIlinearity, and 2 mls of blood samples were collected from the patients into bottles containing Ethylene di amine tetra acetic acid (EDTA) anticoagulant and was properly mixed using a blood mixer. referenceResults intervals, and diagnostic performance [9]. PCV was determined by the microhematocrit by placing the A total of 206 subjects were sampled and 412 paired data centrifuge heparinized blood in a capillary tube (also known were obtained and analysed in this study. The results showed that similar overall mean values of PCV were obtained by both of its length, sealed with plasticine and centrifuged in a micro as microhematocrit tube), the capillary tube was filled to 75% microhematocrit (34.5±7.3%) and Automated (34.3±6.8%). separates the blood into layers. It is then placed on the HC 702 between the overall measurements by both microhematocrit and hematocrithaematocrit andcentrifuge read [7,8].at 10,000 The MicrohematocritRPM for five minutes, centrifuge this theResult Automated of t-test analysisheamatology was notanalyzer. statistically significant (p> 0.05) components include a motor that supplies power to the shaft and rotor centrifuge heads (carriers) that spin on the rotor and a lid latch or lid. centrifuge apply centrifugal force to separate between microhematocrit and Automated measurements of PCV. suspended particles from a liquid or to separate liquids of different Pearson’s analysis revealed a high correlation value (r=0.917) densities, the micro hemetocrit centrifuge is a special purpose Passing-Bablok fit of the regression line provided the equation: and RCFs (relative centrifugal force) of up to15,000g to spin Automated = 1.373 + 0.9692 microhematocrit; and slope value microversion capillary of a fixed tube head samples unit, quickly [16]. The attains Automated speed of haematology 11,000 rpm (0.969, 95% CI: 0.9400 to 1.008) supports the high correlation Analyzer used the counter principle, which blood is passed coefficient (Figure 1). between two electrodes through an aperture so narrow that only one cell can pass through at a time. The change in impedence is proportional to cell volume resulting in a cell count and measure of volume [6]. PCV was determined directly by placing the blood sample in the Automated hematology Analyzer (KX-21N sysmex, USA). The sysmex hematology automated analyser can be run on Racks of blood go in on a tray on the right and come out on the leftits own, side. orThe connected racks hold to ten a blood4.5mL film tubes making and have and a staining notch so unit.. they only go in one way. The sampled blood moves through a tube thin enough that cells pass by one at a time, characteristics about the electrical impedence [6]. The PCV values of both methods were cell are measured using lasers (fluorescent flow cytometry) or properly recorded, all blood samples were analysed within 6hrs Figure 1: Pearson’s correlation plot for PCV after collection and samples were analysed the same time by both the Microhematocrit and the automated method. Table 1: PCV samples characteristics Statistic% Automated Microhematort Minimum 16.5 16 Maximum 59.3 49 Median 35.0 35.0 Mean 34.5 34.3 Mean SE 0.71 0.66 SD 7.3 6.8 Variance 52.9 46.1 Skewness 0.2 -0.4 Kurtosis 1.26 0.02 Figure 2: Bland-Altman plot comparing microhematocrit-Automated measurement Citation:Citation: Audu Pannu I. Stephen,SimonAK (2016) Warfarin T. Ubwa, related Ogbene nephropathy: G. Igbum, et.al. a case (2017) report Analytical from a Comparison tertiary hospital between of northMicrohematocrit
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