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Abstract

This study has been performed on the vegetative parts of the local Horsetail Equisetum arvense L.,which grow naturally in Haj Umran , north of Iraq , included some heamatological tests coccerning blood coagulation by using different concentration of both water and ethanolic extracts in vitro and in vivo . The results revealed that water extract of (25 and 50) mg/ml decreased clotting time in vitro, but higher concentration (100) mg/ml had reverse effect ( stoped coagulation) , Also the low concentration of crude extracts (water and ethanolic) were very efficient to decrease clotting time, and increase platelet count in vivo. But higher concentration (100) mg/ml increased the clotting time with decrease in platelet count .

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