The effects of transport temperature and time on routine and specialized coagulation assays

Coagulation laboratories have largely stopped transporting whole blood specimens on ice, due to adverse effects on factor VIII, von Willebrand factor, and the prothrombin time. However, it is unknown whether ice should be required or avoided for other coagulation assays. Furthermore, the amount of time that specimens remain stable during transportation at room temperature (RT) is also largely unknown for many coagulation tests. Therefore, this study investigated specimen stability on ice and RT for a comprehensive panel of coagulation tests. One tube of whole blood from each volunteer (n = 22) was centrifuged immediately (time 0), one was stored for 4 h on ice, and one was stored for 4 h at RT before centrifugation. Among time 0, 4 h on ice, and 4 h at RT samples, no statistically significant differences were found for fibrinogen, activated protein C resistance, thrombin time, reptilase time, antithrombin activity, chromogenic protein C, factor XII, and antiplasmin activity. Prothrombin time, activated partial thromboplastin time, factors IX, XI, protein S activity, and plasminogen activity showed statistically, but not clinically, significant differences. On ice, the only analytes that showed clinically significant changes (≥6.0% from time 0) were factors VII, VIII, von Willebrand factor antigen, and ristocetin cofactor, which were 14.0% higher, and 19.2, 9.5, and 18.8% lower than time 0, respectively. At RT, all analytes were stable except factor VIII was 9.4...
Source: Blood Coagulation and Fibrinolysis - Category: Hematology Tags: Original Articles Source Type: research

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AbstractThe aim of this study is to assess the relationship between autoimmunity and endothelial activation/damage (ICAM-1 and vWF serum levels) and the degree of prothrombotic activity (thrombin –antithrombin complexes—TAT serum levels) in SLE. In 60 clinically stable SLE patients, levels of the following parameters were estimated in their serum: lupus anticoagulant (LA), anticardiolipin antibodies in both IgG and IgM classes (aCL-IgG and aCL-IgM, respectively), antiβ2GPI antibodies in both IgG and IgM classes (antiβ2GPI-IgG and antiβ2GPI-IgM, respectively), ICAM, von Willebrand factor (vWF), TA...
Source: Clinical Rheumatology - Category: Rheumatology Source Type: research
Abstract Many complement structures and a number of additional factors, i.e. autoantibodies, receptors, hormones and cytokines, are implicated in the complex pathogenesis of systemic lupus erythematosus. Genetic defects in the complement as well as functional deficiency due to antibodies against its components lead to different pathological conditions, usually clinically presented. Among them hypocomplementemic urticarial vasculitis, different types of glomerulonephritis as dense deposit disease, IgA nephropathy, atypical haemolytic uremic syndrome and lupus nephritis are very common. These antibodies cause confor...
Source: Lupus - Category: Rheumatology Authors: Tags: Lupus Source Type: research
Von Willebrand disease (VWD) is the most common congenital bleeding disorder and is due to quantitative or qualitative defects of von Willebrand factor (VWF). Acquired defects of VWF, termed acquired von Willebrand syndrome (AVWS), are due to a host of different mechanisms. Autoantibody-mediated AVWS may be associated with lymphoproliferative or immunological disorders, such as systemic lupus erythematosus (SLE). A large majority of AVWS cases are type 1 or type 2A-like and patients tend to have a mild to moderate bleeding tendency.
Source: Transfusion and Apheresis Science - Category: Hematology Authors: Tags: Case Report Source Type: research
In conclusion, PTX3 concentrations in SLE patients might serve as a indicator of the activation/dysfunction of vascular endothelium. PMID: 25401491 [PubMed - indexed for MEDLINE]
Source: Autoimmunity - Category: Allergy & Immunology Tags: Autoimmunity Source Type: research
In conclusion, plasma DRVVTr and FNG are strong predictors of vascular mortality in PAPS; while FNG lowering agents exist further research should be directed at therapeutic strategies able to dampen aPL production. PMID: 26864875 [PubMed - as supplied by publisher]
Source: Thrombosis and Haemostasis - Category: Hematology Authors: Tags: Thromb Haemost Source Type: research
Discussion Too much or too little causes the important homeostatic balance of life to be upset. This is true of the interactions between the circulatory and hematology systems of the body and their important function in ensuring that the circulatory system plumbing is not leaking (i.e. bleeding) and also not getting plugged up (i.e. thrombosis). A healthy system has adequate numbers of functional platelets, and protein synthesis of the factors needed for a balanced hemostasis system. An adequate amount of Vitamin K is needed for some factors activity. Additionally the absence of any drugs that interfere with platelets or t...
Source: PediatricEducation.org - Category: Pediatrics Authors: Tags: Uncategorized Source Type: news
Semin Thromb HemostDOI: 10.1055/s-0035-1552588The results of lupus anticoagulant (LA), antithrombin (AT), protein C (PC), and protein S (PS) testing, and the values of von Willebrand factor antigen (VWF:Ag) are important in diagnosis and therapeutic monitoring of thrombosis and hemostasis diseases. Till now, no published study has focused on the biological variations in LA testing, and only a few studies have examined the biological variations of AT, PC, PS, and VWF:Ag. With the latest fully automated instruments and improved reagents, the analytical, within-subject, and between-subject biological variations were estimated...
Source: Seminars in Thrombosis and Hemostasis - Category: Hematology Authors: Source Type: research
Objectives: Orthostatic hypotension has been linked with increased mortality and cardiovascular morbidity; however, the underlying mechanisms are still unknown. The aim of the study was to assess markers of coagulability in patients with and without orthostatic hypotension who suffered transient loss of consciousness. Methods: A total of 233 consecutive patients more than 15 years old, with unexplained transient loss of consciousness, underwent head-up tilt test (HUT, Italian protocol). Blood samples were collected during supine rest before and at 3 min of 70° HUT for determination of fibrinogen, von Willebrand facto...
Source: Journal of Hypertension - Category: Cardiology Tags: ORIGINAL PAPERS: Orthostatic hypotension Source Type: research
We present a case concerning a patient with splenic marginal zone lymphoma (SMZL) and isolated prolonged activated partial thromboplastin time (aPTT) caused by lupus anticoagulant. Von Willebrand factor (VWF) activity and antigen were immeasurable by latex particle immunoturbidimetric assays, and several coagulation factor levels were decreased. However, VWF activity and antigen were normal when analyzed by other methods. Also, coagulation factor levels were normal if an aPTT reagent with low lupus anticoagulant sensitivity or a chromogenic method was applied. Altogether, the initial findings were because of lupus anticoag...
Source: Blood Coagulation and Fibrinolysis - Category: Hematology Tags: Case Reports Source Type: research
CONCLUSIONS: Storage vials, freezing and thawing condition affect coagulation testing, although these differences may not be clinically significant. PMID: 25766006 [PubMed - as supplied by publisher]
Source: International Journal of Laboratory Hematology - Category: Hematology Authors: Tags: Int J Lab Hematol Source Type: research
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