A total of 2321 paired aPTT/anti-Xa values from 539 patients were studied. Data pairs were discordant most of the time: 413 (18%) data pairs had a low aPTT value compared with the anti-Xa value ...

Following implementation of an anti-Xa method for heparin dosing protocols in our hospital, we became aware of many patients with discordant aPTT and anti-Xa values. Objective: To determine the ...