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Clinical Biochemistry

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https://www.readbyqxmd.com/read/28342804/easy-to-use-equations-for-the-estimation-of-urine-relative-saturation-in-the-assessment-of-risk-of-recurrence-in-urinary-stones-formers
#1
Geneviève Plante, Denis Ouimet, Robert Robitaille
It is a fact that recurrence of urinary stones is a common medical problem. One of the key factors used in determining the risk of urinary stone-formation is the urine relative saturation in the major constituents of lithiasis. Nomograms were developed in the 1970's to estimate the relative saturation of urine. We present here easy-to-use mathematical equations derived from these nomograms. These equations can be integrated directly in the LIS of any laboratories, and can be used as a tool in the treatment and prevention of recurrent stone-formation...
March 22, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28336392/diagnostic-laboratories-in-asia-pacific-region-investigation-on-quality-characteristics-and-time-of-reporting
#2
Tony C Badrick, Anton Gutscher, Nakako Sakamoto, Daniel Chin
This is the result of a Survey of various aspects of quality, cost and speed in a large sample of diagnostic laboratories in the Asia Pacific region. It is the first of its type to be published and represents a snapshot of the current performance in a large number of diagnostic laboratories in a broad range of countries in the Asia Pacific region. This demonstrates that there are common issues facing all the laboratories surveyed but also common solutions using a Quality Systems approach which involves Accreditation, Customer responsiveness, greater use of IT, automation and Lean principles...
March 20, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28336391/serum-high-c-reactive-protein-concentrations-are-related-to-the-intake-of-dietary-macronutrients-and-fiber-findings-from-a-large-representative-persian-population-sample
#3
Sayyed Saeid Khayyatzadeh, Seyyed Mohammad Reza Kazemi-Bajestani, Mohammad Bagherniya, Mehraneh Mehramiz, Maryam Tayefi, Mahmoud Ebrahimi, Gordon A Ferns, Mohammad Safarian, Majid Ghayour-Mobarhan
OBJECTIVE: Serum high-sensitivity CRP is a marker of inflammation and an independent predictor of chronic diseases. However, the effect of diet on serum hs-CRP is unclear. The aim of this study was to investigate the relationship between dietary macronutrient intake and serum hs-CRP. DESIGN AND METHODS: We recruited 9778 adults, aged 35-65years as part of the MASHAD study. Dietary intake was determined using 24-hour dietary recall and several biochemical parameters including serum hs-CRP were measured...
March 20, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28322757/impaired-clinical-utility-of-sequential-patient-gem-blood-gas-measurements-associated-with-calibration-schedule
#4
George S Cembrowski, Qian Xu, Adam R Cembrowski, Junyi Mei, Hossein Sadrzadeh
BACKGROUND: Within- and/or between-instrument variation may falsely indicate patient trends or obscure real trends. We employ a methodology that transforms sequential intra-patient results into estimates of biologic and analytic variation. We previously derived realistic biologic variation (sb) of blood gas (BG) and hematology analytes. We extend this methodology to derive the imprecision of two GEM 4000 BG analyzers. METHODS: A laboratory data repository provided arterial BG, electrolyte and metabolite results generated by two GEM 4000s on ICU patients in 2012-2013...
March 18, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28322756/establishing-reference-intervals-for-galectin-3-concentrations-in-serum-requires-careful-consideration-of-its-biological-determinants
#5
Magdalena Krintus, Marek Kozinski, Tomasz Fabiszak, Jacek Kubica, Mauro Panteghini, Grazyna Sypniewska
BACKGROUND: Appropriately established reference intervals for laboratory biomarkers may help the interpretation of their results and facilitate clinical utilization. OBJECTIVES: i) To determine reference intervals for serum galectin-3 measured using the Architect STAT immunoassay, and ii) to identify factors affecting galectin-3 concentrations. METHODS: We recruited 533 questionnaire-identified apparently healthy individuals, in which laboratory biomarkers were used to detect asymptomatic myocardial injury and dysfunction, ongoing inflammation, hyperglycemia, dyslipidemia, and renal dysfunction...
March 18, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28322753/myeloperoxidase-asymmetric-dimethyl-arginine-and-the-renin-angiotensin-aldosterone-system-in-cardiovascular-risk-patients-cross-sectional-findings-from-the-ludwigshafen-risk-and-cardiovascular-health-luric-study
#6
Sieglinde Zelzer, Dietmar Enko, Stefan Pilz, Andreas Tomaschitz, Winfried März, Andreas Meinitzer
OBJECTIVES: The leukocyte-derived myeloperoxidase (MPO), the nitric oxidase synthase (NOS) inhibitor asymmetrical dimethyl-arginine (ADMA) and the renin-angiotensin-aldosterone-system (RAAS) are associated with cardiovascular diseases (CVD). This study aimed to investigate potential interactions between the RAAS, ADMA and MPO in cardiovascular risk patients. DESIGN AND METHODS: All in all, 1446 patients, who were referred to coronary angiography, were included in this prospective study...
March 18, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28322755/letter-to-the-editor-regarding-the-usefulness-of-the-refrigeration-test-in-addition-to-triglyceride-levels-for-the-detection-of-chylous-ascites-and-pleural-effusions
#7
LETTER
Adrian Klak, Simon Degandt, Maxime De Sloovere, Michel Langlois, Pieter Vermeersch
No abstract text is available yet for this article.
March 17, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28322754/evaluation-of-the-clsi-ep26-a-protocol-for-detection-of-reagent-lot-to-lot-differences
#8
Brooke M Katzman, Karl M Ness, Alicia Algeciras-Schimnich
BACKGROUND: Verification of new reagent lots is a required laboratory task. The Clinical and Laboratory Standards Institute (CLSI) EP26-A guideline provides a lot-to-lot verification protocol to detect significant changes in test performance. The aim of this study was to compare the performance of EP26-A with our laboratory reagent lot verification protocol. METHODS: Prospective evaluations for two reagent lots each for thyroid stimulating hormone (TSH), thyroglobulin (Tg), thyroxine (T4), triiodothyronine (T3), free triiodothyronine (fT3), and thyroid peroxidase antibody (TPOAb) were performed...
March 17, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28300544/pre-analytical-and-analytical-aspects-affecting-clinical-reliability-of-plasma-glucose-results
#9
REVIEW
Sara Pasqualetti, Federica Braga, Mauro Panteghini
The measurement of plasma glucose (PG) plays a central role in recognizing disturbances in carbohydrate metabolism, with established decision limits that are globally accepted. This requires that PG results are reliable and unequivocally valid no matter where they are obtained. To control the pre-analytical variability of PG and prevent in vitro glycolysis, the use of citrate as rapidly effective glycolysis inhibitor has been proposed. However, the commercial availability of several tubes with studies showing different performance has created confusion among users...
March 11, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28300543/antibodies-against-monomeric-c-reactive-protein-a-promising-biomarker-of-lupus-nephritis
#10
Katarzyna Jakuszko, Magdalena Krajewska, Katarzyna Kościelska-Kasprzak, Marta Myszka, Agata Sebastian, Katarzyna Gniewek, Piotr Wiland, Marian Klinger
OBJECTIVE AND AIM: A significant incidence of systemic lupus erythematosus (SLE), the severity of lupus nephritis and varying responses to treatment rationalize the search for novel biomarkers of disease activity. The aim of the study was to assess whether antibodies against monomeric C reactive protein (anti-mCRP) are associated with the presence of lupus nephritis, correlate with disease activity, and whether they can serve to evaluate a response to treatment. METHODS: The study involved 74 patients with lupus nephritis, 29 patients with systemic lupus without renal involvement and 31 patients with primary glomerulonephritis; the control group included 31 healthy volunteers...
March 11, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28288852/altered-circulating-concentrations-of-active-glucagon-like-peptide-glp-1-and-dipeptidyl-peptidase-4-dpp4-in-obese-subjects-and-their-association-with-insulin-resistance
#11
Radwan H Ahmed, Hasniza Zaman Huri, Sekaran Muniandy, Zaid Al-Hamodi, Boshra Al-Absi, Abdulsamad Alsalahi, Muhammad Fm Razif
OBJECTIVES: Soluble DPP4 (sDPP4) is a novel adipokine that degrades glucagon-like peptide (GLP-1). We evaluated the fasting serum levels of active GLP-1 and sDPP4 in obese, overweight and normal weight subjects to assess the association between sDPP4 levels, active GLP-1 levels and insulin resistance in obese subjects. METHODS: The study involved 235 Malaysian subjects who were randomly selected (66 normal weight subjects, 97 overweight, 59 obese subjects, and 13 subjects who were underweight)...
March 11, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28288853/establishing-evidence-based-thresholds-and-laboratory-practices-to-reduce-inappropriate-treatment-of-pseudohyperkalemia
#12
Pratistha Ranjitkar, Dina N Greene, Geoffrey S Baird, Andrew N Hoofnagle, Patrick C Mathias
BACKGROUND: Unrecognized pseudohyperkalemia (PHK), defined as an artificial increase in measured potassium concentration, due to thrombocytosis and leukocytosis can lead to inappropriate patient treatment. Understanding the laboratory and patient characteristics that increase risk of PHK is key to preventing diagnostic errors. METHODS: Serum/plasma potassium results collected at 2 laboratories over 4years were selected based on blood cell counts collected within 24h and whole blood potassium concentrations determined within 2h of the serum/plasma sample...
March 10, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28288851/clinically-distinct-presentations-of-copper-deficiency-myeloneuropathy-and-cytopenias-in-a-patient-using-excessive-zinc-containing-denture-adhesive
#13
Sahara J Cathcart, Alina G Sofronescu
OBJECTIVES: While copper deficiency has long been known to cause cytopenias, copper deficiency myeloneuropathy is a more recently described entity. Here, we present the case of two clinically distinct presentations of acquired copper deficiency syndromes secondary to excessive use of zinc-containing denture adhesive over five years: myeloneuropathy and severe macrocytic anemia and neutropenia. METHODS: Extensive laboratory testing and histologic evaluation of the liver and bone marrow, were necessary to rule out other disease processes and establish the diagnosis of copper deficiency...
March 10, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28288850/comparison-of-umbilical-cord-tissue-and-meconium-for-the-confirmation-of-in-utero-drug-exposure
#14
Jennifer M Colby
OBJECTIVES: Drug screening in neonates is traditionally performed using meconium, but cord tissue has been proposed as an alternative specimen. This study compares the detection of drugs in a large number of paired meconium and umbilical cord tissue samples from subjects at risk of in utero drug exposure. DESIGN AND METHODS: Physician-ordered toxicology results and clinical information were collected in a retrospective review of subject medical records. All toxicology testing was performed by a national reference laboratory using a combination of immunoassays and chromatography-mass spectrometry...
March 10, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28288849/whole-blood-selenium-determination-by-inductively-coupled-plasma-mass-spectrometry
#15
Dustin R Bunch, Wendy Cieslak, Sihe Wang
OBJECTIVE: To develop a sensitive method for accurately measuring whole blood selenium and determining an appropriate reference interval for the local Cleveland population. DESIGN AND METHODS: The assay was developed and validated on an inductively coupled plasma mass spectrometry (ICP-MS) with a collision cell. Whole blood trace element free EDTA tubes were used to collect samples for the reference interval study (n=50). Samples were collected after at least 8h fast from healthy adults (76% females) with ages between 19 and 64yr...
March 10, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28286138/one-hundred-years-of-clinical-laboratory-automation-1967-2067
#16
Jason Y Park, Larry J Kricka
No abstract text is available yet for this article.
March 9, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28284827/the-role-of-laboratory-in-ensuring-appropriate-test-requests
#17
REVIEW
Simona Ferraro, Mauro Panteghini
This review highlights the role of laboratory professionals and the strategies to be promoted in strict cooperation with clinicians for auditing, monitoring and improving the appropriateness of test request. The introduction of local pathways and care maps in agreement with international and national guidelines as well as the implementation of reflex testing and algorithms have a central role in guiding test request and in correcting the overuse/misuse of tests. Furthermore, removing obsolete tests from laboratory menu and vetting of restricted tests is recommended to increase cost-effectiveness...
March 9, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28283329/the-dark-side-of-point-of-care-testing
#18
Jlv Shaw
No abstract text is available yet for this article.
March 7, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28263715/hemoglobinopathies-thalassemias-why-clinical-biochemists-need-to-know-about-them
#19
Trefor Higgins
No abstract text is available yet for this article.
March 2, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28263716/statistical-considerations-for-determining-high-sensitivity-cardiac-troponin-reference-intervals
#20
Peter E Hickman, Gus Koerbin, Julia M Potter, Walter P Abhayaratna
The troponin 99th percentile is used as the laboratory decision point in the diagnosis of acute myocardial infarction. A recent publication has shown that the statistical treatment for outlier removal may dramatically change the calculated troponin 99th percentile. We have used our large database from the previously reported Canberra Heart Study to independently assess the effect of various methods for removing outliers on the calculated 99th percentile. We have performed the same exercise using the troponin 97...
March 1, 2017: Clinical Biochemistry
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