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Mixing test. The activated partial thromboplastin time (APTT) was measured on day 122 with our patient's plasma mixed with normal plasma collected from healthy individuals, in various proportions. APTT was measured immediately after the mixing (solid line) and after a two-hour incubation at 37°C (dashed line). The incubation prolonged APTT as compared to no incubation, suggesting the presence of a circulating anticoagulant.
