title: D-dimer, other markers of haemostasis activation and soluble adhesion molecules in patients with different clinical probabilities of deep vein thrombosis.
abstract: Two automated turbidimetric D-dimer assays (BC D-dimer Plus, Dade Behring, Marburg, Germany and Auto-Dimer, Biopool, Umeå, Sweden) were compared to two enzyme-linked immunosorbent assays (ELISAs) (Enzygnost D-dimer micro, Dade Behring and Asserachrome D-dimer, Diagnostica Stago, Asnières, France) and two rapid D-dimer assays (SimpliRed, Agen Biomedical, Brisbane, Australia and Minutex, Biopool) in out-patients with suspected deep vein thrombosis (DVT). In addition, the performance of prothrombin fragment 1+2 (F1+2), thrombin-antithrombin complex (TAT), and soluble adhesion molecules VCAM-1 and P-selectin for DVT diagnosis was assessed. One hundred and thirty-five consecutive out-patients with suspected DVT of the lower limb were included, and in 52 (39%), DVT was confirmed by compression ultrasound. All D-dimer assays investigated reliably excluded DVT in those patients without DVT irrespective of their pre-test clinical probability of DVT. One D-dimer ELISA (Dade Behring) gave the highest area under the receiver operating characteristic (ROC) curve compared to other assays, and therefore, this was the most accurate assay in differentiating patients with from patients without DVT. The diagnostic performance of one automated turbidimetric assay (Auto Dimer, Biopool) was similar to ELISA and its convenience close to rapid latex agglutination assays. Most patients with a high pre-test clinical probability of DVT had positive D-dimer regardless of the presence or absence of DVT, which decreased the specificity of the tests and made D-dimer determination less useful for this group of patients. Because the diagnostic accuracy [sensitivity, specificity, negative (NPV) and positive predictive value (PPV)] of F1+2, TAT, VCAM-1 and P-selectin was inferior to D-dimer assay, these assays could not substitute or supplement D-dimer testing in diagnosis of DVT. Levels of VCAM-1 and P-selectin were increased in patients with DVT and should therefore be investigated further to clarify their role in DVT.
authors.affiliation: Department of Angiology, University Medical Centre, Riharjeva 24, SI-1000 Ljubljana, Slovenia. mojca.bozic@trnovo.kclj.si
authors.forename: Mojca
authors.initials: M
authors.lastname: Bozic
authors.forename: Ales
authors.initials: A
authors.lastname: Blinc
authors.forename: Mojca
authors.initials: M
authors.lastname: Stegnar
mesh_terms: D000328:Adult; D000368:Aged; D000990:Antithrombin III; D015415:Biomarkers / Q000097:blood; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005338:Fibrin Fibrinogen Degradation Products / Q000032:analysis / Q000378:metabolism*; D006487:Hemostasis; D006801:Humans; D008297:Male; D008875:Middle Aged; D009391:Nephelometry and Turbidimetry; D019007:P-Selectin / Q000097:blood; D010446:Peptide Fragments / Q000097:blood; D010447:Peptide Hydrolases / Q000097:blood; D011237:Predictive Value of Tests; D011516:Prothrombin; D012307:Risk Factors; D012680:Sensitivity and Specificity; D019010:Vascular Cell Adhesion Molecule-1 / Q000097:blood; D020246:Venous Thrombosis / Q000097:blood* / Q000175:diagnosis* / Q000209:etiology
chemical_list: D015415:Biomarkers; D005338:Fibrin Fibrinogen Degradation Products; D019007:P-Selectin; D010446:Peptide Fragments; D019010:Vascular Cell Adhesion Molecule-1; C046193:antithrombin III-protease complex; C036309:fibrin fragment D; C045879:prothrombin fragment 1.2; D000990:Antithrombin III; D011516:Prothrombin; D010447:Peptide Hydrolases