Anti-Xa Assay

How to Cite This Chapter: Don-Wauchope A, Chetty VT, Ivica J, Kavsak P, Khan WI, Lafreniere M, Nouri K, Solnica B. Anti-Xa Assay. McMaster Textbook of Internal Medicine. Kraków: Medycyna Praktyczna. Accessed May 26, 2024.
Last Updated: May 9, 2022
Last Reviewed: May 9, 2022
Chapter Information

For a brief introduction and guide to abbreviations, see Laboratory Tests: General Remarks.

Analyte [material]

Anti-Xa assay (heparin) [P]

Anti-Xa assay (low-molecular-weight heparin) [P]

Reference range, target level, or decision threshold

Anti-Xa assay (heparin):

Therapeutic use: 0.35-0.70 IU/mLHRI

Occasionally used for monitoring UFH.

Anti-Xa assay (low-molecular-weight heparin):

Therapeutic use: 0.5-1 IU/mLHRI

Monitored in certain settings, eg, in renal impairment.

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