Progressive antithrombin activity and the immunological levels of antithrombin III, α2-macroglobulin, and α1-antitrypsin were measured in women at various intervals during treatment with oral contraceptives and in a group of untreated women. No significant changes were observed in any of the above parameters. In both control and treated women, there was a positive statistical correlation between progressive antithrombin activity and antithrombin III immunological levels, whereas no correlation was found between the former and α1-antitrypsin or α2-macroglobulin immunological levels. This study questions the possibility of thrombin inhibitors being selective signs of hypercoagulability during treatment with oral contraceptives.

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