Topic Completed: 1 June 2012

Revised: 4 January 2019, last major update June 2012

Copyright: (c) 2002-2016,, Inc.

PubMed Search: Antithrombin [title] coagulation

Page views in 2019: 23
Page views in 2020 to date: 25
Cite this page: Parsons J. Antithrombin. website. Accessed August 3rd, 2020.
Definition / general
  • Formerly called antithrombin III
  • Member of serine protease inhibitor (serpin) gene family on #1q23-25
  • Functions as anticoagulant by inhibiting activated factors II (thrombin), IX, X, XI, XII, kallikrein, plasmin and probably factor VII (all are serine proteases)
  • Activity is accelerated 1000x by interaction with heparin or heparan sulfate (located on endothelial cells)
Diagrams / tables

Flickr image courtesy of Kendall Crookston, M.D., Ph.D.:

Missing Image

Natural anticoagulants

Back to top