Data pairs were discordant most of the time: 413 (18%) data pairs had a low aPTT value compared with the anti-Xa value, 971 (42%) had a high aPTT value compared with the anti-Xa value, and 937 (40 ...

Results: A total of 2321 paired values from 539 patients were studied; 42% of data pairs had a high aPTT value relative to the anti-Xa value. Patients with elevated baseline prothrombin time ...