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lupus anticoagulant testing

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https://www.readbyqxmd.com/read/29157179/association-between-false-positive-torch-and-antiphospholipid-antibodies-in-healthy-pregnant-women
#1
S De Carolis, S Tabacco, F Rizzo, G Perrone, C Garufi, A Botta, S Salvi, P Benedetti Panici, A Lanzone
The present study investigated: (a) the presence of antiphospholipid antibodies and (b) the obstetric outcome in healthy pregnant women showing false-positive TORCH-Toxoplasmosis, Other: syphilis, varicella-zoster, Rubella, Cytomegalovirus (CMV), and Herpes infections-results. Data from 23 singleton healthy pregnancies with false-positive TORCH results were collected. Each woman was systematically screened for TORCH IgG and IgM during the pre-conception assessment and/or at the beginning of pregnancy. In the presence of IgM positivity, when indicated (CMV, toxoplasmosis, rubella, herpes simplex virus), IgG avidity was evaluated and, if possible, polymerase chain reaction was performed on an amniotic fluid sample in order to distinguish between primary infection or false positivity...
January 1, 2017: Lupus
https://www.readbyqxmd.com/read/29126301/coagulation-testing-in-the-core-laboratory
#2
William E Winter, Sherri D Flax, Neil S Harris
Primary hemostasis begins with endothelial injury. VWF, produced by endothelial cells, binds to platelets and links them to subendothelial collagen. Platelet-derived ADP and thromboxane activate non-adhered platelets via their GPIIb/IIIa receptors, allowing these platelets to participate in platelet aggregation. Secondary hemostasis is initiated with the binding of factor VII to extravascular tissue factor (TF). Factors II, VII, IX and X are vitamin K-dependent factors. The role of vitamin K is to assist in the addition of gamma carboxylate groups to glutamic acids in the "GLA" domains of these factors...
November 8, 2017: Laboratory Medicine
https://www.readbyqxmd.com/read/29072238/prevalence-of-lupus-anticoagulant-in-women-with-spontaneous-abortion-in-zaria
#3
I N Ibrahim, A I Mamman, S E Adaji, A Hassan, A A Babadoko
INTRODUCTION: Spontaneous abortion (SA) is a common complication of pregnancy. Presence of lupus anticoagulant (LA), one of the antiphospholipid antibodies, has been associated with SA in many studies, especially in Caucasians. This study was carried out to determine the prevalence of LA in women with SA in ABUTH, Zaria. MATERIALS AND METHODS: A cohort of 100 consecutive women presenting with SA with no history of thrombotic episodes were enrolled into the study...
September 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28985591/antiphospholipid-syndrome-and-recurrent-miscarriage-a-systematic-review-and-meta-analysis
#4
REVIEW
Thaís da Silva Santos, Andressa Lorena Ieque, Hayalla Corrêa de Carvalho, Ana Maria Sell, Maria Valdrinez Campana Lonardoni, Izabel Galhardo Demarchi, Quirino Alves de Lima Neto, Jorge Juarez Vieira Teixeira
Antiphospholipid syndrome (APS) is an autoimmune condition that is associated with thrombosis and morbidity in pregnancy. The exact mechanisms by which these associations occur appear to be heterogeneous and are not yet well understood. The aim of this study was to identify and analyze publications in recent years to better understand the diagnosis and its contribution to monitoring APS among women with recurrent miscarriage (RM). This systematic review and meta-analysis was conducted using the PubMed and Web of Knowledge databases, with articles published between 2010 and 2014, according to the PRISMA statement...
September 2017: Journal of Reproductive Immunology
https://www.readbyqxmd.com/read/28961286/asymptomatic-cutaneous-polyarteritis-nodosa-treatment-options-and-therapeutic-guidelines
#5
Kate Ross, Jessika Contreras, David Aung-Din, Mary Lien
Cutaneous polyarteritis nodosa (CPAN) is a rare cutaneous small- to medium-vessel vasculitis of unknown etiology. Clinically it ranges in manifestation from livedo reticularis to large cutaneous ulcers and necrosis. Prognosis is favorable and progression to systemic polyarteritis nodosa is rare. There are multiple treatment options, none of which have proven to be definitively effective. Cutaneous polyarteritis nodosa has been associated with abnormal antibody testing with elevations of antiphospholipid cofactor antibody, lupus anticoagulant, anticardiolipin antibody, and anti-β2-glycoprotein I-dependent cardiolipin antibodies, as well as elevated anti-phosphatidylserine-prothrombin complex antibody...
August 2017: Cutis; Cutaneous Medicine for the Practitioner
https://www.readbyqxmd.com/read/28914278/magnitude-of-potentially-inappropriate-thrombophilia-testing-in-the-inpatient-hospital-setting
#6
Eric Mou, Henry Kwang, Jason Hom, Lisa Shieh, Andre Kumar, Ilana Richman, Caroline Berube
Laboratory costs of thrombophilia testing exceed an estimated $650 million (in US dollars) annually. Quantifying the prevalence and financial impact of potentially inappropriate testing in the inpatient hospital setting represents an integral component of the effort to reduce healthcare expenditures. We conducted a retrospective analysis of our electronic medical record to evaluate 2 years' worth of inpatient thrombophilia testing measured against preformulated appropriateness criteria. Cost data were obtained from the Centers for Medicare and Medicaid Services 2016 Clinical Laboratory Fee Schedule...
September 2017: Journal of Hospital Medicine: An Official Publication of the Society of Hospital Medicine
https://www.readbyqxmd.com/read/28914273/patterns-and-appropriateness-of-thrombophilia-testing-in-an-academic-medical-center
#7
Nicholas Cox, Stacy A Johnson, Sara Vazquez, Ryan P Fleming, Matthew T Rondina, David Kaplan, Stephanie Chauv, Gabriel V Fontaine, Scott M Stevens, Scott Woller, Daniel M Witt
BACKGROUND: Clinical guidelines recommend against routine use of thrombophilia testing in patients with acute thromboembolism. Thrombophilia testing rarely changes acute management of a thrombotic event. OBJECTIVE: To determine appropriateness of thrombophilia testing in a teaching hospital. DESIGN: Retrospective cohort study. SETTING: One academic medical center in Utah. PARTICIPANTS: All patients who received thrombophilia testing between July 1, 2014, and December 31, 2014...
September 2017: Journal of Hospital Medicine: An Official Publication of the Society of Hospital Medicine
https://www.readbyqxmd.com/read/28900368/testing-lupus-anticoagulants-in-a-real-life-scenario-a-retrospective-cohort-study
#8
Franz Ratzinger, Tanja Panic, Helmuth Haslacher, Thomas Perkmann, Klaus G Schmetterer, Sabine Belik, Georg Maenner, Ingrid Pabinger, Peter Quehenberger
INTRODUCTION: Lupus anticoagulant (LAC) testing is challenging. Most data are derived from a well-controlled study environment with potential alterations to daily routines. The aim of this retrospective cohort study was to assess the capacity of various LAC screening tests and derived mixing tests to predict a positive result in subsequent confirmation tests in a large cohort of patients. MATERIALS AND METHODS: In 5832 individuals, we retrospectively evaluated the accuracy of the aPTT-A, aPTT-LAscreen, aPTT-FS and dRVVTscreen and of their derived mixing tests in detecting a positive confirmation test result within the same blood specimen...
October 15, 2017: Biochemia Medica: časopis Hrvatskoga Društva Medicinskih Biokemičara
https://www.readbyqxmd.com/read/28884609/impact-of-classical-risk-factors-for-arterial-or-venous-thrombosis-in-patients-with-antiphospholipid-syndrome
#9
Daniel Navarro-Carpentieri, Maria Del Carmen Castillo-Hernandez, Karim Majluf-Cruz, Guillermo Espejo-Godinez, Paola Carmona-Olvera, Manuel Moreno-Hernandez, Yolanda Lugo-García, Jesús Hernandez-Juarez, Luis Loarca-Piña, Irma Isordia-Salas, Abraham Majluf-Cruz
There are classical risk factors associated with arterial thrombosis (AT) or venous thromboembolic disease (VTD). However, less is known about these risk factors and AT or VTD episodes in patients with antiphospholipid syndrome (APS). Our aim was to elucidate whether APS-related thrombotic episodes are associated with the same risk factors as the non-APS population. We gathered demographics, medical history, complications, and causes of death associated with the risk factors for AT or VTD in patients with APS...
January 1, 2017: Clinical and Applied Thrombosis/hemostasis
https://www.readbyqxmd.com/read/28876509/clot-waveform-analysis-where-do-we-stand-in-2017
#10
REVIEW
P O Sevenet, F Depasse
Analysis of the optical waveform generated during global coagulation assays, such as activated partial thromboplastin time and prothrombin time, can provide much precious information on the global coagulation state of the plasma sample tested, in addition to a single clotting time. Many studies have been published concerning patient diagnosis and management in haemophilia A, and in the early diagnosis and prognosis of disseminated intravascular coagulation and sepsis. However, many other works have also been published on further potential clinical applications such as lupus anticoagulant diagnosis and anticoagulant monitoring...
September 6, 2017: International Journal of Laboratory Hematology
https://www.readbyqxmd.com/read/28804830/solid-phase-immunoassay-for-the-detection-of-anticardiolipin-antibodies
#11
Rohan Willis, Elizabeth Papalardo, E Nigel Harris
The anticardiolipin (aCL) test was first developed in the 1980s and proved to be a valuable addition to the lupus anticoagulant assay for identifying patients with a disorder that came to be later known as the antiphospholipid syndrome (APS). Although the test has relatively poor specificity for APS diagnosis, particularly at low positive levels, it has continued to play a major role in the identification and management of these patients because of its high sensitivity and ability to be measured in both serum and plasma, and despite concomitant presence of anticoagulants normally given to APS patients...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28804829/lupus-anticoagulant-testing-activated-partial-thromboplastin-time-aptt-and-silica-clotting-time-sct
#12
Armando Tripodi, Veena Chantarangkul
Actvated partial thromboplastin time and its congener test Silica clotting time are used for the laboratory detection of lupus anticoagulants. Their performance consists of mixing test plasma with activators of the contact coagulation factors, phospholipids and calcium chloride, and recording the clotting time. Here we describe the principle, performance and extensive practical details of the two methods, the problems that may be encountered and how they can be identified and overcome.
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28804828/lupus-anticoagulant-testing-diluted-russell-viper-venom-time-drvvt
#13
Vittorio Pengo, Elisa Bison, Alessandra Banzato, Giacomo Zoppellaro, Seena Padayattil Jose, Gentian Denas
Diluted Russell Viper Venom Time (dRVVT) has become the most popular test to detect Lupus Anticoagulant (LA). dRVVT is more sensitive than other global tests employed to detect LA and is not affected by inhibitors of factor VIII or IX. The test is most successfully implemented if you observe three steps in its execution: screening, mixing, and confirmatory studies. Interference due to the presence of heparin in tested plasma must be excluded by means of thrombin time (TT). The prior use of Vitamin K Antagonists (VKAs) or Non-vitamin K Oral Anticoagulants (NOACs) must also be evaluated by means of International Normalized Ratio, or specific tests, respectively...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28804819/performance-of-activated-partial-thromboplastin-time-aptt-determining-reagent-sensitivity-to-factor-deficiencies-heparin-and-lupus-anticoagulants
#14
Geoffrey Kershaw
The activated partial thromboplastin time (APTT) is a useful global assay for the assessment of the contact factor pathway of hemostasis and its inhibitors. The test is usually performed on fully automated analyzers using commercially prepared reagents. The three main clinical areas of interest are detection of factor deficiencies, detection of lupus anticoagulants and in the monitoring of therapy with unfractionated heparin. Methods are described here for assessing APTT reagents for their sensitivity to clotting time prolongation in each of these areas of interest...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28803708/anti-phospholipid-syndrome-current-opinion-on-mechanisms-involved-laboratory-characterization-and-diagnostic-aspects
#15
REVIEW
Jean Amiral, Marie Peyrafitte, Claire Dunois, Anne Marie Vissac, Jerard Seghatchian
Anti-phospholipid syndrome is a complex and severe clinical situation, associated with symptoms such as recurrent thrombosis, arterial or venous, at any site, pregnancy loss, and other related syndromes. These clinical burdens, are highly variable from patient to patient, and are associated with biological abnormalities, such as the presence of the Lupus Anticoagulant or phospholipid dependent antibodies, confirmed on two occasions at least 12 weeks apart. From the diagnosis standpoint, both, functional (clotting) or immunological assays, are difficult to standardize and to optimize, due to the absence of reference material, or a characteristic clinical group, and international reference preparations...
July 15, 2017: Transfusion and Apheresis Science
https://www.readbyqxmd.com/read/28770876/assessment-of-the-underlying-causes-of-the-immune-thrombocytopenia-ten-years-experience
#16
Mehmet Sinan Dal, Abdullah Karakus, Tuba Dal, Berrin Balik Aydin, Elif Hattapoglu, Mehmet Onder Ekmen, Turgay Ulas, Orhan Ayyildiz
OBJECTIVE: Immune thrombocytopenia (ITP) is an immune haematologic disorder causing platelet destruction mediated by anti-platelet antibodies. In this study we aimed to evaluate the clinical and laboratory variables of ITP patients in southeast of Turkey. METHODS: In this retrospective study 167 ITP patients between 2005 and 2015 were evaluated. All patients were screened for immunological parameters including ANA (antinuclear antibodies), anti dsDNA (anti-double-stranded-DNA), ACA(anti-cardiolipin) IgM and IgG, LA (lupus anticoagulants)...
July 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28769114/diagnosing-antiphospholipid-syndrome-extra-criteria-manifestations-and-technical-advances
#17
REVIEW
Savino Sciascia, Mary-Carmen Amigo, Dario Roccatello, Munther Khamashta
First described in the early 1980s, antiphospholipid syndrome (APS) is a unique form of acquired autoimmune thrombophilia in which patients present with clinical features of recurrent thrombosis and pregnancy morbidity and persistently test positive for the presence of antiphospholipid antibodies (aPL). At least one clinical (vascular thrombosis or pregnancy morbidity) and one lab-based (positive test result for lupus anticoagulant, anticardiolipin antibodies and/or anti-β2-glycoprotein 1 antibodies) criterion have to be met for a patient to be classified as having APS...
September 2017: Nature Reviews. Rheumatology
https://www.readbyqxmd.com/read/28762061/direct-antiglobulin-coombs-test-in-systemic-lupus-erythematosus-patients
#18
Thelma Skare, Leandro Picelli, Thiago Alberto G Dos Santos, Renato Nisihara
The objective of the study is to study the positivity of Coombs test or direct antiglobulin test (DAT) in systemic lupus erythematosus (SLE) patients and its relationship with disease's clinical and serological profile. Retrospective study of 373 SLE patients seen at single Rheumatology Unit. Epidemiological data (age, gender, age at disease onset, auto declared ethnic background and tobacco use), clinical (malar rash, photosensitivity, oral ulcers, discoid lesions, serositis, glomerulonephritis, convulsions, psychosis, hemolytic anemia, leukopenia, lymphocytopenia and arthritis), and serological profile (anti ds DNA, anti Ro/SS-A; anti La/SS-B, Anti RNP, Anti Sm, aCl (anticardiolipin) IgG, aCl Ig M, LA or lupus anticoagulant, rheumatoid factor and direct Coombs) were collected...
July 31, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28755727/plasma-antiphospholipid-antibodies-effects-on-activated-partial-thromboplastin-time-assays
#19
Ke Yao, Lingyun Zhang, Hang Zhou, Ning Tang, Dengju Li
BACKGROUND: Activated partial thromboplastin time (aPTT) assays can be affected by plasma antiphospholipid antibodies (aPLs), but the degree of the interference is not easy to predict. This study aimed to investigate the effects on aPTT assay results of different types and combinations of aPLs, including anti-β2-glycoprotein I antibodies, anticardiolipin antibodies and lupus anticoagulant. MATERIALS AND METHODS: We retrospectively collected clinical information and laboratory tests from aPL-positive patients...
July 2017: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/28740966/portal-vein-thrombosis-as-a-rare-cause-of-abdominal-pain-when-to-consider
#20
Cengiz Tavusbay, Erdinç Kamer, Turan Acar, İbrahim Kokulu, Haldun Kar, Özlem Gür
Extrahepatic portal vein thrombosis (PVT) is a rare condition that is characterized by the presence of thrombus within any segment of the portal vein, including the right and left intrahepatic branches. It may also extend to the splenic or superior mesenteric veins. Portal vein thrombosis may be related to cirrhosis or liver malignancy as well as to local inflammatory conditions in the abdomen and genetic or acquired thrombophilic diseases. Currently, PVT is being increasingly diagnosed due to advances in modern imaging techniques...
2017: Turk J Surg
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