Why was citric acid or oxalic acid used as an anticoagulant

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Herparin is a mucopolysaccharide extracted from beef lung and liver that inhibits the action of thrombin. what effect would thrombin have on the prothrombin time and APTT? why was citric acid or oxalic acid used as an anticoagulant instead of heparin in these tests?

Reference no: EM13139980

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