In a prospective study of deep vein thrombosis (DVT), detected by the Tc-plasmin test, in 34 patients with acute myocardial infarction sequential determinations were made in plasma by immunologic methods of histidine-rich glycoprotein (HRG) and total plasminogen and the concentrations of free plasminogen calculated. Mean plasma HRG concentrations were consistently higher in the group of patients, in which Tc-plasmin scanning had revealed the existence of DVT. The effect of HRG caused the level of free plasminogen to be only 50-60% of the level of total plasminogen. Fluctuations of HRG caused only minor changes in free plasminogen concentrations. Our data suggest that HRG acts as a weak, negative acute phase reactant.
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