Abstract
Heparin and heparin fragments of different molecular weight and with different anti-factor Xa/APTT activity ratios were studied with respect to their ability to inhibit thrombus formation in an animal model. It is concluded that: a) Neither anti-factor Xa nor the APTT activity alone is a good reflector of the antithrombotic activity. b) Anti-factor Xa active fragments must have a minimum molecular weight in order to elicit good antithrombotic activity. c) High affinity for antithrombin III is important for good antithrombotic activity. d) A heparin fragment of molecular weight 4 000 has the same antithrombotic activity as heparin but less effect on the clotting time.
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