... assay test is high [58].Unfortunately, the more precise carbon 14-serotonin releaseassay is not routinely available. Awaiting final diagnosis, allkinds of heparins should be discontinued and ... Randomized, clinical trial comparison of trisodiumcitrate 30% and heparin as catheter-locking solution in hemodialysis patients. J Am Soc Nephrol 2005, 16:2769-2777.19. Grudzinski L, Quinan P, Kwok ... analyses indicate increased bleeding ifsystemic aPTT is longer than 45 seconds [31]. At this lowlevel of anticoagulation, activated clotting time is relativelyinsensitive for monitoring [46]. However,...