Article 1 Biomarkers 1 Blood Chemical Analysis 1 Humans 1 Protein C 1 Sensitivity and Specificity 1 Venous Thrombosis 1 biological marker 1 blood 1 blood analysis 1 chromogenic substrate assay 1 chromogenic-based assay 1 clinical effectiveness 1 controlled study 1 deep vein thrombosis 1 deep venous thrombosis devices 1 diagnostic value 1 human 1 intermethod comparison 1 linear system 1 method comparison 1 performance evaluation 1 procedures 1 protein C 1 protein determination 1 receiver operating characteristic 1 reliability 1 sensitivity and specificity 1 vein thrombosis 1