Of the 2321 aPTT/anti-Xa data pairs, 1337 (58%) had a PT/INR value from the same day. Data pairs with a relatively high aPTT value ... thromboembolism. a This test was not performed in all patients.

In addition, each aPTT/anti-Xa data pair that had a PT/INR determined the same date was identified and categorized as associated with either a low (<1.5) or high (≥1.5) INR. Once patients had ...