Which lab tests are performed in the workup of antithrombin III (ATIII) deficiency?

Updated: Mar 04, 2020
  • Author: James L Harper, MD; Chief Editor: Hassan M Yaish, MD  more...
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Laboratory studies that can be performed in the workup for antithrombin III deficiency include the following:

  • Antithrombin assays
  • Prothrombin time (PT) and activated partial thromboplastin time (aPTT)
  • Protein C (antigen and activity tests) and protein S (total and free tests)
  • Factor V Leiden testing
  • Homocysteine level
  • Anticardiolipin antibodies (immunoglobulin G [IgG] and IgM class)

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