Fig. 2From: Variation in coagulation factor activity levels cause discrepancies between activated partial thromboplastin time and anti-Xa activity for heparin monitoring: a retrospective observational studyScatter plot between anti-Xa activity and activated partial thromboplastin time. Green circle, upper group; blue circle, concordant group; red circle, lower group; black curve, the relationship between anti-Xa activity and APTT in normal plasma. APTT, activated partial thromboplastin timeBack to article page