[Determination of anti-Xa activity in cancer patients].

: Low molecular-weight heparins (clexan, fraxiparin, fragmin) were used in cancer patients to prevent hemostatic system disorders and related complications. The adequacy and safety of therapy were assessed measuring plasma anti-Xa activity in 239 patients. When the prophylactic doses of the low molecular-weight heparins clexan, fraxiparin, and fragmin were given, their anticoagulative effect was similar as judged from anti-Xa activity. Clexan exhibited the maximum anti-Xa activity when the therapeutic doses of the low molecular-weight heparins were used.