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 ...

Background: Both the activated partial thromboplastin time (aPTT) and anti-Xa assay can be used to monitor unfractionated heparin (UFH). Following implementation of an anti-Xa method for heparin ...