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Clinical Biochemistry

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https://www.readbyqxmd.com/read/27914934/a-practical-way-to-overcome-ascorbate-interference-in-total-cholesterol-and-triglyceride-measurement-by-exploiting-the-autoxidation-property-of-ascorbate
#1
LETTER
Jisook Yim, Jooyoung Cho, Sunyoung Ahn, Sang-Guk Lee, Jeong-Ho Kim
No abstract text is available yet for this article.
November 30, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27913270/part-1-comparison-of-plasma-ammonia-results-from-seven-different-automated-platforms-in-use-throughout-central-australia
#2
Corey Markus, Michael Metz
INTRODUCTION: The clinical catchment area for the Metabolic service at the Women's and Children's Hospital in Adelaide, South Australia, covers nearly 2.5millionkm(2). Care of children with metabolic disorders in these remote areas is assisted from Adelaide, and at times, using plasma ammonia results from laboratories up to 3000km away. There are seven different platforms measuring plasma ammonia within this vast clinical catchment area. Hence, a correlation study was conducted to examine the relationship between plasma ammonia results from the seven different platforms in use throughout central Australia...
November 29, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27894953/biological-variability-of-lipoprotein-associated-phospholipase-a2activity-in-healthy-individuals
#3
Leslie J Donato, Jeffrey W Meeusen, Sarah M Jenkins, Stacy J Hartman, Amy K Saenger, Nikola A Baumann, Darci R Block, Allan S Jaffe
OBJECTIVES: Measuring lipoprotein-associated phospholipase A2 (Lp-PLA2) activity can aid in identifying individuals at higher risk of coronary heart disease. However, the biological variation of Lp-PLA2 activity and corresponding reference change value (RCV) is unknown which limits interpretation of results. In this study we aim to define the intra- and inter-individual variability of Lp-PLA2 activity in a healthy reference population. METHODS: A total of 24 healthy individuals (22-47years of age) were prospectively collected at several time points: daily for five days (after overnight fast), daily for three days (while non-fasting), weekly for four weeks (after overnight fast), and monthly for 6months (after overnight fast)...
November 25, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27894952/comparison-of-creatinine-and-cystatin-c-based-egfr-in-the-estimation-of-glomerular-filtration-rate-in-indigenous-australians-the-egfr-study
#4
Elizabeth Lm Barr, Louise J Maple-Brown, Federica Barzi, Jaquelyne T Hughes, George Jerums, Elif I Ekinci, Andrew G Ellis, Graham Rd Jones, Paul D Lawton, Cherian Sajiv, Sandawana W Majoni, Alex Dh Brown, Wendy E Hoy, Kerin O'Dea, Alan Cass, Richard J MacIsaac
BACKGROUND: The Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation that combines creatinine and cystatin C is superior to equations that include either measure alone in estimating glomerular filtration rate (GFR). However, whether cystatin C can provide any additional benefits in estimating GFR for Indigenous Australians, a population at high risk of end-stage kidney disease (ESKD) is unknown. METHODS: Using a cross-sectional analysis from the eGFR Study of 654 Indigenous Australians at high risk of ESKD, eGFR was calculated using the CKD-EPI equations for serum creatinine (eGFRcr), cystatin C (eGFRcysC) and combined creatinine and cystatin C (eGFRcysC+cr)...
November 25, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27890823/assessment-of-thyroid-function-in-intensive-care-unit-patients-by-liquid-chromatography-tandem-mass-spectrometry-methods
#5
Kerry J Welsh, Brian R Stolze, Xiaolin Yu, Trisha R Podsiadlo, Lisa S Kim, Steven J Soldin
OBJECTIVES: Patients with non-thyroidal illness syndrome have many abnormalities in thyroid hormone tests. Such patients have medical comorbidities associated with low serum proteins and are on multiple medications that interfere with thyroid hormone measurement by immunoassay platforms. It is unknown if these thyroid hormone measurements reflect physiologic conditions or if they are artifacts of testing methodology. METHODS: Fifty patients were selected from the intensive care unit (ICU) from our institution...
November 25, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27890824/evaluating-a-switch-from-meconium-to-umbilical-cord-tissue-for-newborn-drug-testing-a-retrospective-study-at-an-academic-medical-center
#6
Kendra L Palmer, Kelly E Wood, Matthew D Krasowski
BACKGROUND: The objective of this study was to compare detection rates of newborn drug exposure at an academic medical center transitioning from meconium to umbilical cord tissue toxicology testing. METHODS: We performed an Institutional Review Board-approved retrospective chart review on all newborns (n=2072) for whom newborn drug testing was ordered at our academic medical center between June 2012 and August 2015 (in August 2013, umbilical cord tissue became the preferred specimen)...
November 24, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27889567/prognostic-value-of-plasma-apelin-concentrations-at-admission-in-patients-with-st-segment-elevation-acute-myocardial-infarction
#7
Jordi Sans-Roselló, Gregori Casals, Xavier Rosselló, Bernardino González de la Presa, Montserrat Vila, Albert Duran-Cambra, Manuel Morales-Ruiz, Andreu Ferrero-Gregori, Wladimiro Jiménez, Alessandro Sionis
BACKGROUND: The use of plasma biomarkers is relevant for the prognosis of ST-segment elevation myocardial infarction (STEMI) patients. Apelin, an adipocytokine, plays a pivotal role in the pathophysiology of both ischemia/reperfusion injury and its potential subsequent heart failure. We evaluated apelin concentrations at admission as a biomarker to assess risk of 6-month mortality. METHODS: Consecutive patients with STEMI were recruited from January 2012 to January 2013 (n=250)...
November 23, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27889566/pitfalls-in-the-detection-of-n-methyl-d-aspartate-receptor-nmda-r-antibodies
#8
LETTER
Matteo Gastaldi, Anaïs Thouin, Diego Franciotta, Angela Vincent
No abstract text is available yet for this article.
November 23, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27884705/analytical-and-clinical-validation-of-the-new-ultrasensitive-roche-thyroglobulin-ii-assay
#9
LETTER
Marcelo C Batista, Carlos E S Ferreira, Paulo R S Ferreira, Adriana C L Faulhaber, André L O Silva, Cristóvão L P Mangueira
No abstract text is available yet for this article.
November 21, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27876610/establishing-reference-intervals-for-hcg-in-postmenopausal-women
#10
Khushbu K Patel, Abraham J Qavi, Karl G Hock, Ann M Gronowski
BACKGROUND: Plasma concentrations of human chorionic gonadotropin (hCG) have been shown to increase with age due to pituitary secretion. We previously recommended that an hCG cutoff of 14.0IU/L be used for women ≥55years of age. However, it remains unknown whether concentrations >14.0IU/L can be expected in women with advanced age. Our objectives were to establish plasma hCG reference intervals and correlate follicle stimulating hormone (FSH) and hCG concentrations in postmenopausal females ≥55years...
November 19, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27876609/laboratory-medicine-advances-and-challenges
#11
E Delvin
No abstract text is available yet for this article.
November 19, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27876608/the-achievements-of-clinical-chemistry-testing-1967-2017
#12
Joris R Delanghe
No abstract text is available yet for this article.
November 19, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27871894/optimizing-gdna-extraction-from-fresh-frozen-meningioma-tissue-for-downstream-genetic-analysis
#13
D T Proctor, E H Yoo, Z Vujadinovic, S Lama, G van Marle, G R Sutherland
OBJECTIVE: Meningioma is the most common brain tumor. Genetic mutations in meningioma that include deletion of the neurofibromatosis type 2 gene, (NF2), offer diagnostic information on tumor behavior, recurrence and potential response to treatment. Obtaining high-grade genetic material is critical for accurate, sensitive and robust molecular testing. Currently, no standardized procedure exists for extracting gDNA from meningioma, and this problem was addressed in this report. METHOD: This study compared the yield and quality of extracted gDNA from patient meningioma specimens using an optimized phenol chloroform method and two commercial silica column-based extractions kits and tested respective performances as template in qPCR tests and multiplex ligation-dependent probe amplification (MLPA) NF2 screening...
November 19, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27867087/a-quantitative-immunoassay-for-lung-cancer-biomarker-ciz1b-in-patient-plasma
#14
Dawn Coverley, Gillian Higgins, Daniel West, Oliver T Jackson, Adam Dowle, Aidan Haslam, Eve Ainscough, Rebecca Chalkey, John White
OBJECTIVES: Non-invasive tests for early detection of lung cancer are an important unmet clinical need. CIZ1b plasma biomarker can discriminate stage 1 lung cancer from within high-risk groups with clinically useful accuracy, with ROC AUCs in excess of 0.9 for two independent retrospective cohorts, and could therefore meet this need. Our aim was to characterise the native state of the biomarker and develop a quantitative immunoassay. DESIGN AND METHODS: Selective denaturation, preparative electrophoresis and mass spectrometry of human plasma were used to characterise the biomarker and interaction partners...
November 17, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27865783/the-modulation-of-inflammatory-parameters-brain-derived-neurotrophic-factor-levels-and-global-histone-h4-acetylation-status-in-peripheral-blood-of-patients-with-gaucher-disease-type-1
#15
Alexandre Silva de Mello, Ivy Reichert Vital da Silva, Gustavo Pereira Reinaldo, Gilson Pires Dorneles, Jaqueline Cé, Pedro Dal Lago, Alessandra Peres, Viviane Rostirola Elsner, Janice Carneiro Coelho
OBJECTIVES: Gaucher's disease type 1 (GD1) pathophysiology includes an imbalance on brain-derived neurotrophic factor (BDNF) levels and in the inflammatory system. However, the pathways involved remain poorly understood. The hypothesis of this study is that epigenetic mechanisms might be involved, at least partially, in this phenomenon. DESIGN AND METHODS: This study investigated the BDNF modulation, global histone H4 acetylation and pro- and anti-inflammatory cytokines levels in the peripheral blood of GD1 patients (n=10) when compared with control samples (CS) (n=11)...
November 16, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27865782/application-of-nano-lc-maldi-tof-tof-ms-for-proteomic-analysis-of-microvesicles
#16
Joanna Kasprzyk, Ewa Stępień, Wojciech Piekoszewski
Activated platelets and platelet derived microvesicles (PMVs) emerged recently to be promising biomarkers. There is no universal procedure to carry out the proteomic analysis on microvesicles. In this study we proposed a nano-liquid chromatography (nano-LC) technique coupled off-line with a spectrometric measurement MALDI-TOF-MS/MS as a throughput and time-saving procedure. In this study we developed a simplified method to evaluate the protein composition of platelet organelles and PMVs. Platelet-rich plasma (PRP) was collected from healthy donors...
November 16, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27863965/robustness-of-the-reichert-unistat-bilirubinometer-for-analysis-of-hemolyzed-samples-from-neonates
#17
Christopher R McCudden, Kathy Fleming, Michelle Warr
BACKGROUND AND OBJECTIVES: Bilirubin is routinely measured in neonates to avoid the irreversible effects of kernicterus. Grossly hemolyzed samples are routinely rejected under the assumption that bilirubin cannot be accurately measured in hemolyzed samples. The objective of this study was to determine the effect of hemolysis on bilirubin measurement in neonates. METHODS: Data included 2-years of paired bilirubin results (n=70) where hemolyzed and non-hemolyzed samples were collected and measured within 6h of each other...
November 15, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27863211/comparison-of-two-methods-for-measuring-25-oh-vitamin-d-in-the-follow-up-of-patients-after-bilio-pancreatic-diversion-bariatric-surgery
#18
Ahlem Chouiali, Pierre-Luc Mallet, Guy Fink, Simon Biron, Marie-France Langlois
OBJECTIVE: Our objective was to compare the ECLIA from Roche versus the LC-MS/MS method for quantitation of serum 25-hydroxy-vitamin D in patients who have undergone bariatric surgery. DESIGN AND METHODS: Cross-sectional and correlational studies were performed on three different groups for the 25-OH-D levels quantitated by both methods. The control group of apparently healthy subjects was randomly selected in a clinical chemistry laboratory. Test groups were patients who had undergone bilio-pancreatic diversion (BPD) and were supplemented either with vitamin D2 or with vitamin D3...
November 15, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27847340/relevance-of-pre-analytical-blood-management-on-the-emerging-cardiovascular-protein-biomarkers-tweak-and-hmgb1-and-on-mirna-serum-and-plasma-profiling
#19
Daniela Basso, Andrea Padoan, Thomas Laufer, Vittorio Aneloni, Stefania Moz, Hannah Schroers, Michela Pelloso, Anna Saiz, Medea Krapp, Paola Fogar, Paola Cornoldi, Carlo-Federico Zambon, Elisa Rossi, Marco La Malfa, Alberto Marotti, Thomas Brefort, Tanja M Weis, Hugo A Katus, Mario Plebani
BACKGROUND: Disease-independent sources of biomarker variability include pre-analytical, analytical and biological variance. The aim of the present study was to evaluate whether the pre-analytical phase has any impact on the emerging heart disease TWEAK and HMGB1 protein markers and miRNA biomarkers, and whether peptidome profiling allows the identification of pre-analytical quality markers. METHODS: An assessment was made of sample type (serum, EDTA-Plasma, Citrate-Plasma, ACD-plasma, Heparin-plasma), temperature of sample storage (room temperature or refrigerated), time of sample storage (0...
November 12, 2016: Clinical Biochemistry
https://www.readbyqxmd.com/read/27847339/analytical-evaluation-of-a-new-point-of-care-system-for-measuring-cardiac-troponin-i
#20
Danielle Wm Kemper, Veronique Semjonow, Femke de Theije, Diederick Keizer, Lian van Lippen, Johannes Mair, Bernadette Wille, Michael Christ, Felicitas Geier, Pierre Hausfater, David Pariente, Volkher Scharnhorst, Joyce Curvers, Jeroen Nieuwenhuis
OBJECTIVES: Point-of-care cardiac troponin testing with adequate analytical performances has the potential to improve chest pain patients flow in the emergency department. We present the analytical evaluation of the newly developed Philips Minicare cTnI point-of-care immunoassay. DESIGN & METHODS: Li-heparin whole blood and plasma were used to perform analytical studies. The sample type comparison study was performed at 4 different hospitals. The 99th percentile upper reference limit (URL) study was performed using Li-heparin plasma, Li-heparin whole blood and capillary blood samples from 750 healthy adults, aging from 18 to 86years...
November 12, 2016: Clinical Biochemistry
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