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Practical Laboratory Medicine

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https://www.readbyqxmd.com/read/29487891/enzymatic-measurement-of-ether-phospholipids-in-human-plasma-after-hydrolysis-of-plasma-with-phospholipase-a-1
#1
Shiro Mawatari, Seira Hazeyama, Tomomi Morisaki, Takehiko Fujino
Objectives: Ethanolamine ether phospholipids (ePE) and choline ether phospholipid (ePC) are present in human serum or plasma. Decreases in ether phospholipids (plasmalogens) in serum (plasma) have been reported in several diseases such as Alzheimer's disease, Parkinson's disease, metabolic syndrome, schizophrenia. Therefore, need for assay of ether phospholipids in plasma may increase in the future. Nowadays, measurement of the ether phospholipids in human plasma seem to depend on tandem mass spectrometry (LC/MS/MS), but a system for LC/MS/MS is too expensive for most of ordinary clinical laboratories, moreover, use and maintenance of the system are time consuming...
March 2018: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/29487890/method-validation-of-a-set-of-12-gem%C3%A2-premier%C3%A2-4000-blood-gas-analyzers-for-point-of-care-testing-in-a-university-teaching-hospital
#2
Charlotte Oris, Yoan Clavel, Matthieu Jabaudon, Annick Pialat, Hadj Abdelkader Mohamed, Frédérique Lioret, Vincent Sapin, Damien Bouvier
Background: Blood gas analyzers are o0.ften integrated into point-of-care testing provisions. International standards (ISO 22870 and 15189) as adapted to French COFRAC regulations make accreditation of point-ofta-care testintag obligatory. We installed and assessed 12 GEM PREMIER 4000 analyzers for pH, p CO2 , p O2 , Na+ , K+ , Cl- , Ca2+ , lactate, hemoglobin and oxyhemoglobin (O2 Hb) at Clermont-Ferrand Hospital. These instruments were distributed across 11 care sites in the hospital...
March 2018: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/29349114/evaluation-of-a-new-venous-catheter-blood-draw-device-and-its-impact-on-specimen-hemolysis-rates
#3
Ruth Natali, Cara Wand, Kelly Doyle, Jaime H Noguez
Objectives: Blood collections from peripheral intravenous catheters offer several benefits to patients, including reduced needle punctures and patient discomfort, but they risk reducing the quality of blood specimens analyzed by the laboratory. In an effort to balance analytical quality of test results with patient-centered care initiatives, a needle-less blood collection device called PIVO™ was evaluated at two institutions. The primary objective of this study was to assess the ability of the PIVO™ device to provide high-quality blood specimens for laboratory testing compared to current blood collection methods...
March 2018: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/29326970/revisiting-sweat-chloride-test-results-based-on-recent-guidelines-for-diagnosis-of-cystic-fibrosis
#4
Jayson V Pagaduan, Mahesheema Ali, Michael Dowlin, Liye Suo, Tabitha Ward, Fadel Ruiz, Sridevi Devaraj
Objectives: Recent sweat chloride guidelines published by the Cystic Fibrosis Foundation changed the intermediate sweat chloride concentration range from 40-59 mmol/L to 30-59 mmol/L for age > 6 months. We wanted to know how this new guideline would impact detection of cystic fibrosis among patients who previously had sweat tests done at Texas Children's Hospital. Methods: We revisited sweat chloride test results (n = 3012) in the last 5 years at Texas Children's Hospital based on the new guidelines on diagnosis of cystic fibrosis from the Cystic Fibrosis Foundation...
March 2018: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/29234708/simple-and-rapid-validated-hplc-fluorescence-determination-of-perampanel-in-the-plasma-of-patients-with-epilepsy
#5
Susan Mohamed, Carmina Candela, Roberto Riva, Manuela Contin
We present a simple and fast high-performance liquid chromatography method with fluorescence detection for the determination of the antiepileptic drug perampanel in human plasma. The chromatographic separation was performed on a Kinetex PFP (100 × 2.6 mm, 4.6 µm) column, using a mobile phase of sodium acetate 0.03 M pH 3.7 and acetonitrile (40/60, v/v), at a flow rate of 0.8 mL/min. Total chromatography time for each run was 5 min. Sample preparation (250 µL) involved only one simple precipitation step by acetonitrile spiked with mirtazapine as internal standard...
March 2018: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/29234707/point-of-care-testing-of-fecal-calprotectin-as-a-substitute-for-routine-laboratory-analysis
#6
Julie Hejl, Klaus Theede, Brian Møllgren, Kirsten Vikkelsø Madsen, Ashraf Heidari, Anna Á Steig, Mogens Fenger
Objectives: Fecal calprotectin (FC) is widely used to monitor the activity of inflammatory bowel disease (IBD) and to tailor medical treatment to disease activity. Laboratory testing of fecal samples may have a turnaround time of 1-2 weeks, whereas FC home testing allows results within hours and thus enables a rapid response to clinical deterioration. Design and methods: Fifty-five stool samples were analyzed by the IB Doc ® Calprotectin Home Testing kit and the BÜHLMANN fCAL® turbo assay on a Roche Cobas 6000 c501...
March 2018: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/29204509/evaluation-of-semi-automatic-image-analysis-tools-for-cerebrospinal-fluid-electrophoresis-of-igg-oligoclonal-bands
#7
G Forzy, L Peyrodie, S Boudet, Z Wang, A Vinclair, V Chieux
Background: IgG concentrations in cerebrospinal fluid generally range from 20 to 45 mg/L. In multiple sclerosis immune reactions lead to intrathecal synthesis of specific IgGs that can be detected in biological fluid samples both quantitatively and qualitatively by isoelectric focusing of supplementary oligoclonal IgG bands. Method: A simple tool, using the MATLAB application, to facilitate and improve isoelectric focusing profile analysis is presented and evaluated in terms of its sensitivity, repeatability and reproducibility...
March 2018: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/29159257/development-and-analytical-performance-of-a-new-architect-automated-dipeptidyl-peptidase-4-immunoassay
#8
Philip M Hemken, Nicolette M Jeanblanc, Tracey Rae, Susan E Brophy, Maria J Datwyler, Ying Xu, T Scott Manetz, Inna Vainshtein, Meina Liang, Xiaodong Xiao, Partha S Chowdhury, Chien-Ying Chang, Katie Streicher, Lydia Greenlees, Koustubh Ranade, Gerard J Davis
Background: Dipeptidyl peptidase-4 (DPP-4) may be a suitable biomarker to identify people with severe asthma who have greater activation of the interleukin-13 (IL-13) pathway and may therefore benefit from IL-13-targeted treatments. We report the analytical performance of an Investigational Use Only immunoassay and provide data on the biological range of DPP-4 concentrations. Methods: We assessed assay performance, utilising analyses of precision, linearity and sensitivity; interference from common endogenous assay interferents, and from asthma and anti-diabetic medications, were also assessed...
December 2017: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/29159256/cirrhosis-of-liver-interference-of-serpins-in-quantification-of-serpina4-a-preliminary-study
#9
Krishna Sumanth Nallagangula, K N Shashidhar, V Lakshmaiah, C Muninarayana
Background: Cirrhosis of liver is a pathological condition, wherein functions of liver are impaired by chronic liver exploitations. Due to decrease in synthetic capacity, expressions of plasma proteins tend to decrease in blood stream. Serpins (Serine protease inhibitors) are class of plasma proteins expressed from liver with structural similarities and diverse functions. SERPINA4 (Kallistatin) is a multifunctional serpin clade A protein expressed from liver and concentration in serum is the reflection of extent of liver dysfunction...
December 2017: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/29159255/comparative-diagnostic-performance-of-the-granulocyte-and-neutrophil-counts
#10
Nicola S Pether, Jessica L Brothwood, Cornelis van Berkel, Elaine H Dunwoodie, Robert L Blake, Christopher P Price, Richard G Jones, Karl S Baker, Geoff Hall
Objectives: Use of point-of-care testing is increasing, however many haematology analysers can only determine granulocyte count without further differentiation into neutrophils, eosinophils and basophils. Since the diagnosis of life-threatening neutropenia in cancer patients requires a distinct neutrophil count, this study aimed to determine the comparative performance between the neutrophil and granulocyte count. Design and methods: A database of 508 646 venous full blood count results measured on a laboratory reference analyser was mined from a large oncology unit...
December 2017: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/29034305/fecal-zonulin-is-elevated-in-crohn-s-disease-and-in-cigarette-smokers
#11
Karin Malíčková, Irena Francová, Milan Lukáš, Martin Kolář, Eva Králíková, Martin Bortlík, Dana Ďuricová, Lenka Štěpánková, Kamila Zvolská, Alexandra Pánková, Tomáš Zima
OBJECTIVES: Human zonulin is a protein that increases permeability in the epithelial layer of the small intestine by reversibly modulating the intercellular tight junctions. There is not sufficient information available about zonulin's participation in inflammatory bowel diseases (IBD). The aim of this study was therefore to investigate fecal and serum zonulin in IBD patients and its relation to the disease localization, behavior and smoking status. DESIGN AND METHODS: Forty IBD patients and forty healthy persons were examined for fecal and serum zonulin concentrations by competitive ELISA (DRG International Inc)...
December 2017: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/29034304/validated-low-volume-aldosterone-immunoassay-tailored-to-gclp-compliant-investigations-in-small-sample-volumes
#12
J Schaefer, B B Burckhardt, J Tins, A Bartel, S Laeer
INTRODUCTION: Heart failure is well investigated in adults, but data in children is lacking. To overcome this shortage of reliable data, appropriate bioanalytical assays are required. OBJECTIVES: Development and validation of a bioanalytical assay for the determination of aldosterone concentrations in small sample volumes applicable to clinical studies under Good Clinical Laboratory Practice. METHODS: An immunoassay was developed based on a commercially available enzyme-linked immunosorbent assay and validated according to current bioanalytical guidelines of the EMA and FDA...
December 2017: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/29034303/validation-of-capillary-blood-analysis-and-capillary-testing-mode-on-the-epoc-point-of-care-system
#13
Jing Cao, Rachel Edwards, Janette Chairez, Sridevi Devaraj
BACKGROUND: Laboratory test in transport is a critical component of patient care, and capillary blood is a preferred sample type particularly in children. This study evaluated the performance of capillary blood testing on the epoc Point of Care Blood Analysis System (Alere Inc). METHODS: Ten fresh venous blood samples was tested on the epoc system under the capillary mode. Correlation with GEM 4000 (Instrumentation Laboratory) was examined for Na+, K+, Cl-, Ca2+, glucose, lactate, hematocrit, hemoglobin, pO2, pCO2, and pH, and correlation with serum tested on Vitros 5600 (Ortho Clinical Diagnostics) was examined for creatinine...
December 2017: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/29034302/comparison-of-two-immunoassay-systems-for-hcg%C3%AE-and-papp-a-in-prenatal-screening-for-trisomy-21-18-and-13-in-the-first-trimester
#14
Anna Elise Engell, Elin Rebecka Carlsson, Finn Stener Jørgensen, Steen Sørensen
OBJECTIVES: The biochemical serum markers free β-human chorionic gonadotropin (hCGβ) and pregnancy associated plasma protein A (PAPP-A), used in screening for trisomy 21 (T21), trisomy 18 (T18), and trisomy 13 (T13) during the first trimester, can be measured on different laboratory instruments e.g. Kryptor (Brahms) and Cobas (Roche). We compared the performance of these two analytical instruments when used for first trimester combined testing. DESIGN AND METHODS: Serum samples from 944 singleton pregnant women attending for first trimester combined testing were routinely assayed for hCGβ and PAPP-A on Kryptor, and re-analyzed on Cobas...
December 2017: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/29034301/effects-of-one-directional-pneumatic-tube-system-on-routine-hematology-and-chemistry-parameters-a-validation-study-at-a-tertiary-care-hospital
#15
A-Jin Lee, Hun Suk Suh, Chang-Ho Jeon, Sang-Gyung Kim
BACKGROUND: The validation of sample stability through pneumatic tube system (PTS) is essential. The objective of this study was to evaluate the effects of PTS transportation on laboratory results. METHODS: Paired EDTA and SST blood samples were collected from 56 randomly selected patients. Laboratory parameters were compared between PTS group and hand-delivered group. RESULTS: No statistical differences were observed for complete blood counts, white blood cell differential parameters, erythrocyte sedimentation rate and most chemistry parameters between PTS and hand-delivered transport procedures...
December 2017: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/29034300/generating-method-specific-reference-ranges-a-harmonious-outcome
#16
Graham R Lee, Alison Griffin, Kieran Halton, Maria C Fitzgibbon
OBJECTIVES: When laboratory Reference Ranges (RR) do not reflect analytical methodology, result interpretation can cause misclassification of patients and inappropriate management. This can be mitigated by determining and implementing method-specific RRs, which was the main objective of this study. DESIGN AND METHODS: Serum was obtained from healthy volunteers (Male + Female, n > 120) attending hospital health-check sessions during June and July 2011. Pseudo-anonymised aliquots were stored (at - 70 °C) prior t° analysis on Abbott ARCHITECT c16000 chemistry and i 2000SR immunoassay analysers...
December 2017: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/28856234/evaluation-of-cystatin-c-in-malignancy-and-comparability-of-estimates-of-gfr-in-oncology-patients
#17
Melissa Jones, Stephanie Denieffe, Ciara Griffin, Willard Tinago, Maria C Fitzgibbon
OBJECTIVES: Creatinine is the biomarker of choice for use in estimates of kidney function in oncology patients. However as non-renal factors such as muscle mass can influence creatinine concentrations, we evaluated cystatin C as an alternative biomarker and its incorporation in GFR estimating formulae in an oncology setting. Measured GFR is infrequently undertaken in adult clinical practice with the consequent reliance on calculated GFR for patient assessment. DESIGN AND METHODS: Cystatin C and creatinine concentrations were evaluated from 134 oncology patients prior to commencing chemotherapeutic cycles...
August 2017: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/28856233/performance-evaluation-of-enzyme-immunoassay-for-voriconazole-therapeutic-drug-monitoring-with-automated-clinical-chemistry-analyzers
#18
Yongbum Jeon, Minje Han, Eun Young Han, Kyunghoon Lee, Junghan Song, Sang Hoon Song
OBJECTIVE: Voriconazole is a triazole antifungal developed for the treatment of fungal infectious disease, and the clinical utility of its therapeutic drug monitoring has been evaluated. Recently, a new assay for analyzing the serum voriconazole concentration with an automated clinical chemistry analyzer was developed. We evaluated the performance of the new assay based on standardized protocols. METHODS: The analytical performance of the assay was evaluated according to its precision, trueness by recovery, limit of quantitation, linearity, and correlation with results from liquid chromatography-tandem mass spectrometry (LC-MS/MS)...
August 2017: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/28856232/operational-impact-of-using-a-vanadate-oxidase-method-for-direct-bilirubin-measurements-at-an-academic-medical-center-clinical-laboratory
#19
Neha Dhungana, Cory Morris, Matthew D Krasowski
OBJECTIVES: The aim of this study was to compare the operational impact of using vanadate oxidase versus diazo direct bilirubin assays for an academic medical center patient population. DESIGN AND METHODS: Retrospective study was done over an approximately 3.5 year period. The main automated chemistry instrumentation was a Roche Diagnostics cobas 8000 line. The Roche Direct Bilirubin assay was compared to Diazyme Laboratories Direct Bilirubin Assay and Randox Laboratories Direct Bilirubin assay using manufacturer's guidelines for hemolysis index, lipemia index, and analytical measurement range (AMR)...
August 2017: Practical Laboratory Medicine
https://www.readbyqxmd.com/read/28856231/investigation-of-morphological-changes-for-the-discrimination-of-nucleated-red-blood-cells-and-other-leukocytes-in-sysmex-xn-hematology-analyzer-scattergrams-using-transmission-electron-microscopy
#20
Masako Kaido, Yuri Takagi, Mari Kono, Fumie Nakazawa, Shiori Yamamoto, Atsushi Wada, Takashi Morikawa
BACKGROUND: The WNR channel of the XN-Series automated hematology analyzer (Sysmex) counts white blood cells (WBCs) and simultaneously performs a differential counting of basophils and nucleated red blood cells (NRBCs). The detection process involves exposing the cells to WNR-specific reagents containing an acidic detergent and a fluorescent dye and measuring the intensity of the forward scattered light (FSC) and side fluorescence light (SFL). METHOD: We treated isolated peripheral WBCs and NRBCs with specific reagents and assessed the morphological changes in NRBCs and each leukocyte type using transmission electron microscopy (TEM)...
August 2017: Practical Laboratory Medicine
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