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Related Experiment Videos

Different heparin lots: Does it matter?

M A Smythe1, J M Koerber, S J Westley

  • 1Department of Pharmaceutical Services, William Beaumont Hospital, 3601 W 13 Mile Rd, Royal Oak, MI 48073, USA. msmythe@beaumont.edu

Archives of Pathology & Laboratory Medicine
|November 8, 2001
PubMed
Summary
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Heparin lot variation minimally impacts activated partial thromboplastin time (aPTT) correlation and therapeutic ranges. Reevaluating aPTT ranges with each new heparin lot may not be necessary.

Area of Science:

  • Pharmacology
  • Clinical Chemistry
  • Hematology

Background:

  • Heparin is a critical anticoagulant used in various clinical settings.
  • Activated partial thromboplastin time (aPTT) is a common laboratory test used to monitor heparin therapy.
  • Variations in heparin lots could potentially affect the accuracy of aPTT monitoring and heparin levels.

Purpose of the Study:

  • To evaluate the influence of different heparin lots on the correlation between heparin concentration and aPTT.
  • To assess the impact of heparin lot variability on the established aPTT therapeutic range.
  • To determine the effect of heparin lot on measured heparin levels using anti-factor Xa analysis.

Main Methods:

  • Retrospective analysis of data from two prior studies involving 95 and 35 patients, respectively.

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  • Patients received heparin from five different lots (study 1) and three different lots (study 2).
  • Laboratory measurements included aPTT and heparin levels determined by anti-factor Xa analysis, with lot-specific calibration curves.

    • Main Results:

    • Strong correlations between heparin concentration and aPTT were observed across different lots (0.86-0.89).
    • Regression line slopes showed no significant differences between heparin lots.
    • Therapeutic ranges derived from lot-specific heparin levels were comparable, with minimal average bias (0.005-0.036 units/mL).

    Conclusions:

    • Heparin lot variation has a limited impact on the correlation between heparin concentration and aPTT.
    • The therapeutic range for aPTT and measured heparin levels remain consistent across different heparin lots.
    • The necessity of reevaluating the aPTT therapeutic range with every new heparin lot warrants further investigation.