Analysis of Anti-Xa Concentrations in Patients on Treatment Dose Enoxaparin: A Retrospective Chart Review

The purpose of this retrospective chart review was to determine the correlation between full weight-based enoxaparin use and the frequency of anti-Xa concentrations within the defined therapeutic range; to ascertain if anti-Xa monitoring is being appropriately ordered in relation to the timing of enoxaparin dose (after 3 consistent therapeutic doses and 3-5 hours post-dose); to establish if the evidence-based recommended dose adjustment protocol that was studied in the pediatric population was utilized; and if this yielded anti-Xa concentrations within the target range (0.6 -1.1 IU/mL) for an adult population. The data may suggest a lack of correlation between BMI and whether or not the anti-Xa concentration is within the therapeutic range. Further prospective studies are needed to confirm this finding, and to determine the utility of the available dose adjustment nomogram.