Coagulation laboratory tests

Low molecular weight heparin (LMWH)

Topic Completed: 1 November 2012

Minor changes: 23 September 2020

Copyright: 2002-2022,, Inc.

PubMed Search: Low molecular weight heparin (LMWH)

Jeremy C. Parsons, M.D.
Page views in 2021: 29
Table of Contents
Definition / general
Cite this page: Parsons JC. Low molecular weight heparin (LMWH). website. Accessed January 17th, 2022.
Definition / general
  • Recommended to monitor using chromogenic antifactor Xa assay on specimens obtained up to 4 hours after subcutaneous injection of LMWH (Chest 2001;119:64S)
  • Recommended to use different calibrations for LMWH and unfractionated heparin, and to establish calibration curves for each lot and type of LMWH
  • Don’t use PTT to monitor because LMWH doesn’t affect thrombin or factor IXa
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