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Preanalytical

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https://www.readbyqxmd.com/read/28809747/oxidation-of-pth-in-vivo-feature-or-effect-of-preanalytical-conditions
#1
Stan R Ursem, Marc G Vervloet, Jacquelien J G Hillebrand, Renate T de Jongh, Annemieke C Heijboer
BACKGROUND: Posttranslational oxidation of parathyroid hormone (PTH) modifies its biological activity. Measurement of non-oxidized PTH (n-oxPTH) could be an improvement in assessing PTH status, as intact PTH may rather reflect oxidative stress. However, it is debated whether oxidation of PTH occurs in vivo, or whether it is mainly an in vitro artifact. The aim of this study was to investigate the influence of different preanalytical conditions on the oxidation of PTH within a wide range of plasma PTH concentrations and oxidation propensity...
August 15, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28804838/platelet-function-tests-preanalytical-variables-clinical-utility-advantages-and-disadvantages
#2
Anne-Mette Hvas, Erik Lerkevang Grove
Platelet function tests are mainly used in the diagnostic work-up of platelet disorders. During the last decade, the additional use of platelet function tests to evaluate the effect of antiplatelet therapy has also emerged in an attempt to identify patients with an increased risk of arterial thrombosis. Furthermore, platelet function tests are increasingly used to measure residual effect of antiplatelet therapy prior to surgery with the aim of reducing the risk of bleeding. To a limited extend, platelet function tests are also used to evaluate hyperaggregability as a potential marker of a prothrombotic state outside the setting of antiplatelet therapy...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28804816/preanalytical-issues-in-hemostasis-and-thrombosis-testing
#3
Giuseppe Lippi, Emmanuel J Favaloro
Hemostasis testing is critical to many hemorrhagic and thrombotic disorders, wherein laboratory diagnostics can provide critical information for diagnosis, prognostication, and therapeutic monitoring. Due to this crucial role in modern medicine, hemostasis tests should be carried out at their highest degree of quality, thus encompassing standardization and monitoring of all phases of the testing process. It is now clearly established that the preanalytical phase is the most critical and vulnerable part of the total testing process, since up to 70% of diagnostic errors are due to highly manual activities encompassing patient preparation and collection of biological samples, as well as handling, transportation, preparation and storage of blood specimens...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28795528/limit-of-detection-and-threshold-for-positivity-of-the-centers-for-disease-control-and-prevention-assay-for-factor-viii-inhibitors
#4
Connie H Miller, Brian Boylan, Amy D Shapiro, Steven R Lentz, Brian M Wicklund
BACKGROUND: The Bethesda assay (BA) for measurement of factor VIII (FVIII) inhibitors called for quantitation of positive inhibitors using dilutions producing 25-75% residual activity (RA), corresponding to 0.4-2.0 Bethesda units, recommending use of "more sensitive methods" for samples with RA closer to 100%. The Nijmegen modification (NBA) changed the reagents used but not these calculations. Some specimens negative by NBA have been shown to have FVIII antibodies detectable by sensitive immunologic methods...
August 10, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28777141/cytologic-histologic-discrepancies-in-pathology-of-the-uterine-cervix-analysis-of-the-clinical-and-pathologic-factors
#5
Fadi W Abdul-Karim, Bin Yang
Cytologic-histologic correlation (CHC) represents a documented effort to obtain and compare, when available, gynecologic cytology reports with an interpretation of high-grade squamous intraepithelial lesion or malignancy, with the subsequent histopathology report, and to determine the possible cause of any discrepancy. The correlation is influenced by multiple closely interdependent clinical and pathologic factors. Many of these factors including the sensitivity and accuracy of colposcopy-directed biopsy, the diligence of the colposcopist, and the attributes of the cervical lesion represent "preanalytical" factors which can significantly affect the CHC outcome, but are often less emphasized during CHC process...
September 2017: Advances in Anatomic Pathology
https://www.readbyqxmd.com/read/28775174/comparison-of-protein-based-cell-of-origin-classification-to-the-lymph2cx-rna-assay-in-a-cohort-of-diffuse-large-b-cell-lymphomas-in-malaysia
#6
Kean-Chang Phang, Ariz Akhter, Nur Maya Sabrina Tizen, Faridah Abd Rahman, Raja Zahratul Azma, Ghaleb Elyamany, Meer-Taher Shabani-Rad, Noraidah Masir, Adnan Mansoor
AIMS: The cell of origin (COO) based molecular characterisation into germinal centre B-cell-like (GCB) and activated B-cell-like (ABC) subtypes are central to the pathogenesis and clinical course in diffuse large B-cell lymphoma (DLBCL). Globally, clinical laboratories employ pragmatic but less than ideal immunohistochemical (IHC) assay for COO classification. Novel RNA-based platforms using routine pathology samples are emerging as new gold standard and offer unique opportunities for assay standardisation for laboratories across the world...
August 3, 2017: Journal of Clinical Pathology
https://www.readbyqxmd.com/read/28753865/prognostic-biomarkers-used-for-localised-prostate-cancer-management-a-systematic-review
#7
REVIEW
Pierre-Jean Lamy, Yves Allory, Anne-Sophie Gauchez, Bernard Asselain, Philippe Beuzeboc, Patricia de Cremoux, Jacqueline Fontugne, Agnès Georges, Christophe Hennequin, Jacqueline Lehmann-Che, Christophe Massard, Ingrid Millet, Thibaut Murez, Marie-Hélène Schlageter, Olivier Rouvière, Diana Kassab-Chahmi, François Rozet, Jean-Luc Descotes, Xavier Rébillard
CONTEXT: Prostate cancer stratification is based on tumour size, pretreatment PSA level, and Gleason score, but it remains imperfect. Current research focuses on the discovery and validation of novel prognostic biomarkers to improve the identification of patients at risk of aggressive cancer or of tumour relapse. OBJECTIVE: This systematic review by the Intergroupe Coopérateur Francophone de Recherche en Onco-urologie (ICFuro) analysed new evidence on the analytical validity and clinical validity and utility of six prognostic biomarkers (PHI, 4Kscore, MiPS, GPS, Prolaris, Decipher)...
March 7, 2017: European Urology Focus
https://www.readbyqxmd.com/read/28750474/potential-misdiagnosis-of-von-willebrand-disease-and-haemophilia-caused-by-ineffective-mixing-of-thawed-plasma
#8
E J Favaloro, S Oliver, S Mohammed, M Ahuja, E Grzechnik, S Azimulla, J McDonald, G Lima-Oliveira, G Lippi
INTRODUCTION: von Willebrand disease (VWD) reflects a loss or dysfunction in von Willebrand factor (VWF), while haemophilia represents a loss or dysfunction of clotting factors such as factor VIII (FVIII) or FIX. Their diagnosis requires laboratory testing, with this potentially compromised by preanalytical events, including poor sample quality. This study assessed the effect of inadequate mixing as a potential cause of VWD and haemophilia misdiagnosis. METHODS: After completion of requested testing, 48 consecutive patient samples comprising separate aliquots from single collections were individually pooled, appropriately mixed, then frozen in separate aliquots, either at -20°C or -80°C for 2-7 days...
July 27, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/28748476/quantitative-rt-pcr-for-micrornas-in-biofluids
#9
Michael Thorsen, Thorarinn Blondal, Peter Mouritzen
MicroRNAs in biofluids hold great promise as minimally invasive diagnostic biomarkers for a wide range of diseases and biological processes. One of the most sensitive technologies for detection and measuring expression levels of microRNA is quantitative RT-PCR. However, quantification of microRNA in biofluid samples is challenging in many ways. Biofluids contain low levels of RNA and high levels of inhibitors of enzymatic processes like reverse transcription and PCR. Furthermore, biofluids are susceptible to many preanalytical variables...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28714765/comparison-of-estrogen-and-progesterone-receptor-antibody-reagents-using-proficiency-testing-data
#10
Megan L Troxell, Thomas Long, Jason L Hornick, Abiy B Ambaye, Kristin C Jensen
CONTEXT: - Immunohistochemical analysis of estrogen receptor (ER) and progesterone receptor (PgR) expression in breast cancer is the current standard of care and directly determines therapy. In 2010 the American Society of Clinical Oncology and the College of American Pathologists (ASCO/CAP) published guidelines for ER and PgR predictive testing, encompassing preanalytic, analytic, postanalytic factors; antibody validation; and proficiency testing. OBJECTIVE: - To compare the performance of different antibody reagents for ER and PgR immunohistochemical analysis by using CAP proficiency testing data...
July 17, 2017: Archives of Pathology & Laboratory Medicine
https://www.readbyqxmd.com/read/28706925/overcoming-preanalytical-issues-for-diagnosing-diabetes-with-fasting-plasma-glucose
#11
EDITORIAL
Martina Montagnana, Giuseppe Lippi
No abstract text is available yet for this article.
June 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/28694735/what%C3%A2-s-floating-on-my-plasma
#12
Janne Cadamuro, Helmut Wiedemann, Thomas K Felder, Cornelia Mrazek, Ulrike Kipman, Oberkofler Hannes, Elisabeth Haschke-Becher
We report on a preanalytical issue we encountered during routine clinical chemistry analyses, potentially leading to deviated analysis results and believe that it might help other laboratories to overcome similar problems. In a heparin-gel tube we measured an implausible glucose value of 0.06 mmol/L. Re-measurement of the same sample resulted in a glucose value of 5.4 mmol/L. After excluding an analytical error, we inspected the sample closer and found a white material as well as fatty droplets floating on the surface of the plasma tube...
June 15, 2017: Biochemia Medica: časopis Hrvatskoga Društva Medicinskih Biokemičara
https://www.readbyqxmd.com/read/28689156/first-void-urine-a-potential-biomarker-source-for-triage-of-high-risk-human-papillomavirus-infected-women
#13
REVIEW
Severien Van Keer, Jade Pattyn, Wiebren A A Tjalma, Xaveer Van Ostade, Margareta Ieven, Pierre Van Damme, Alex Vorsters
Great interest has been directed towards the use of first-void urine as a liquid biopsy for high-risk human papillomavirus DNA testing. Despite the high correlations established between urinary and cervical infections, human papillomavirus testing is unable to distinguish between productive and transforming high-risk infections that have the tendency to progress to cervical cancer. Thus far, investigations have been primarily confined to the identification of biomarkers for triage of high-risk human papillomavirus-positive women in cervicovaginal specimens and tissue biopsies...
June 27, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/28686397/-preanalytical-step-in-bacteriology-a-practical-overview-for-family-physicians
#14
Myriam M Eyer, Sara Droz
Physicians play a key role in the accuracy of bacteriological results by appropriate prescription and the quality of sample collection, preservation and transport. Samples for diagnostic purposes are of use if analysis results have an impact on the therapeutic approach. They have minimal risk of contamination, are usually obtained invasively, and may be targeted to detection of specific bacteria. Physicians should refer to the laboratory technical manual to provide proper sample quality. Furthermore, they have to provide clinical and administrative information to the microbiologist, because the laboratory analytical process depends on these...
October 12, 2016: Revue Médicale Suisse
https://www.readbyqxmd.com/read/28680354/an-lc-ms-assay-with-isocratic-separation-and-on-line-solid-phase-extraction-to-improve-the-routine-therapeutic-drug-monitoring-of-busulfan-in-plasma
#15
Cristiano Ialongo, Alessia Francesca Mozzi, Sergio Bernardini
BACKGROUND: Busulfan (Bu) requires therapeutic drug monitoring (TDM) in subjects undergoing a conditioning regimen for hematopoietic stem cell transplantation (HSCT). To speed up the procedure and increase reproducibility, we improved our routine LC-MS/MS assay using the on-line solid-phase extraction (SPE) of samples. METHODS: A protein precipitation (PP) step was performed before the on-line SPE of Bu from 200 µL of plasma spiked with octa-deuterated Bu (D8-Bu) as the internal standard...
April 2017: Journal of Medical Biochemistry
https://www.readbyqxmd.com/read/28680348/preanalytical-nonconformity-management-regarding-primary-tube-mixing-in-brazil
#16
Gabriel Lima-Oliveira, Gian Cesare Guidi, Andre Valpassos Pacifici Guimaraes, Jose Abol Correa, Giuseppe Lippi
BACKGROUND: The multifaceted clinical laboratory process is divided in three essential phases: the preanalytical, analytical and postanalytical phase. Problems emerging from the preanalytical phase are responsible for more than 60% of laboratory errors. This report is aimed at highlighting and discussing nonconformity (e.g., nonstandardized procedures) in primary blood tube mixing immediately after blood collection by venipuncture with evacuated tube systems. METHODS: From January 2015 to December 2015, fifty different laboratory quality managers from Brazil were contacted to request their internal audit reports on nonconformity regarding primary blood tube mixing immediately after blood collection by venipuncture performed using evacuated tube systems...
January 2017: Journal of Medical Biochemistry
https://www.readbyqxmd.com/read/28656617/proposal-for-standardized-preanalytical-and-analytical-conditions-for-measuring-thrombin-generation-in-hemophilia-communication-from-the-ssc-of-the-isth
#17
Y Dargaud, A S Wolberg, E Gray, C Negrier, H C Hemker
No abstract text is available yet for this article.
May 26, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28647065/preanalytic-process-linked-to-spuriously-elevated-hiv-viral-loads-improvement-on-an-fda-approved-process
#18
Gary W Procop, Alan J Taege, Colleen Starkey, Marisa Tungsiripat, Diane Warner, Jesse D Schold, Belinda Yen-Lieberman
The processing of specimens often occurs in a central processing area within laboratories. We demonstrated that plasma centrifuged in the central laboratory but allowed to remain within the primary tube following centrifugation was associated with spuriously elevated HIV viral loads compared with recentrifugation of the plasma just prior to testing.
September 14, 2016: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28643538/do-methodological-differences-account-for-the-current-controversy-on-tissue-factor-expression-in-platelets
#19
Marta Brambilla, Laura Rossetti, Chiara Zara, Paola Canzano, Peter L A Giesen, Elena Tremoli, Marina Camera
Tissue factor (TF), the key activator of the blood coagulation cascade and of thrombus formation, is also expressed by circulating human platelets. Despite the documented in-depth characterization of platelet TF carried out in the past 15 years, some authors still fail to identify TF in platelets, especially when assessment in platelet-rich plasma (PRP) or washed platelets is carried out. This study aims to extend the characterization of the subset of TF-positive platelets in PRP from healthy subjects and to verify how different centrifugation forces, used to prepare the PRP, could affect the analysis of TF-positive platelets...
June 23, 2017: Platelets
https://www.readbyqxmd.com/read/28631236/use-of-ctx-i-and-pinp-as-bone-turnover-markers-national-bone-health-alliance-recommendations-to-standardize-sample-handling-and-patient-preparation-to-reduce-pre-analytical-variability
#20
P Szulc, K Naylor, N R Hoyle, R Eastell, E T Leary
The National Bone Health Alliance (NBHA) recommends standardized sample handling and patient preparation for C-terminal telopeptide of type I collagen (CTX-I) and N-terminal propeptide of type I procollagen (PINP) measurements to reduce pre-analytical variability. Controllable and uncontrollable patient-related factors are reviewed to facilitate interpretation and minimize pre-analytical variability. INTRODUCTION: The IOF and the International Federation of Clinical Chemistry (IFCC) Bone Marker Standards Working Group have identified PINP and CTX-I in blood to be the reference markers of bone turnover for the fracture risk prediction and monitoring of osteoporosis treatment...
June 19, 2017: Osteoporosis International
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