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Updated: Sep 8, 2025

Rapid Point-of-Care Assay of Enoxaparin Anticoagulant Efficacy in Whole Blood
Published on: October 12, 2012
Impact of Pharmacist-To-Dose Enoxaparin in Pediatric Patients
Yi Fei Heng1, Andrew Allison1, Emily Clemons1
1Department of Pharmacy (YFH, AA, EC), WVU Medicine Children's Hospital, Morgantown, WV.
Insights
Pharmacist-to-dose (PTD) protocols did not significantly change target anti-Xa levels in pediatric enoxaparin patients. However, PTD improved the accuracy and speed of achieving therapeutic anticoagulation, demonstrating pharmacists' equal quality of care.
Area of Science:
- Pediatric pharmacology
- Pharmacokinetics
- Anticoagulation therapy
Background:
- Enoxaparin pharmacokinetics vary in pediatric patients, necessitating anti-Xa level monitoring for effective anticoagulation.
- Pharmacist-to-dose (PTD) protocols are crucial for optimizing enoxaparin therapy in children for venous thromboembolism prophylaxis and treatment.
Purpose of the Study:
- To evaluate the impact of implementing a pharmacist-led enoxaparin dosing protocol (PTD) on achieving target anti-Xa concentrations in pediatric patients.
- To compare the rates of therapeutic anti-Xa concentrations before and after PTD protocol implementation.
Main Methods:
- Retrospective review of inpatient pediatric enoxaparin use (January 2016-September 2023) at a children's hospital.
- Assessment of enoxaparin indication, dosing, administration, and anti-Xa concentration timing and goal achievement.
- Analysis of secondary outcomes including number of anti-Xa levels drawn, dose adjustments, accuracy, and time to goal.
Main Results:
- No significant difference was observed in the rate of achieving goal anti-Xa concentrations before and after PTD protocol implementation.
- A higher frequency of appropriately drawn anti-Xa concentrations and a shorter time to goal were noted post-PTD, though not statistically significant.
Conclusions:
- Implementation of a PTD protocol did not alter the primary outcome of achieving target anti-Xa concentrations.
- The consistent use of dose adjustment guidelines contributed to similar therapeutic outcomes.
- Pharmacist involvement, even without altering goal achievement rates, positively impacts the efficiency of monitoring and achieving therapeutic anticoagulation.
Objective:
Variations in pharmacokinetics necessitate monitoring anti-Xa concentrations for optimal anticoagulation in pediatric patients receiving enoxaparin for the prophylaxis or treatment of venous thromboembolism. Pharmacists play an essential role through pharmacist-to-dose (PTD) protocols. This study aims to assess the impact of pharmacist involvement by comparing rates of achieving target anti-Xa concentrations before and after implementation of the PTD protocol in a pediatric population.
Methods:
Medical records were queried for patients 18 years old and younger who received enoxaparin as an inpatient at West Virginia University Medicine Children's Hospital from January 2016 to September 2023. Indication, dosing, and administration of enoxaparin were assessed. Anti-Xa concentrations were evaluated for appropriate timing and goal range. Secondary outcomes included the number of anti-Xa concentrations drawn, the number of enoxaparin dose adjustments, the rate of accurately drawn anti-Xa concentrations, the rate of following guideline recommended enoxaparin dosing on initiation, and the time to goal anti-Xa concentration.
Results:
There was no difference in the rate of anti-Xa concentrations that were in goal before and after the implementation of a pharmacist-led enoxaparin dosing protocol. The frequency of concentrations drawn appropriately was higher, and the time to goal was shorter after the implementation of the PTD protocol, although this difference was not statistically significant.
Conclusions:
There was no difference in the rate of anti-Xa concentrations that were in goal between groups. This likely stemmed from the use of the same dose adjustment guideline among both groups. This underscores the equal quality of care provided by pharmacists in achieving optimal anticoagulation and positive outcomes.
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