C1 Esterase Inhibitor

How to Cite This Chapter: Don-Wauchope A, Chetty VT, Ivica J, Kavsak P, Khan WI, Lafreniere M, Nouri K, Solnica B. C1 Esterase Inhibitor. McMaster Textbook of Internal Medicine. Kraków: Medycyna Praktyczna. https://empendium.com/mcmtextbook/chapter/B31.1269.3.7.105. Accessed May 24, 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]

C1 esterase inhibitor [S/P]

C1 esterase inhibitor, functional [P]

Reference range, target level, or decision threshold

C1 esterase inhibitor:

Concentration: 0.2-0.36 g/L!!!

Activity: 55%-80% to 120%-135% (depending on method)!!!

C1 esterase inhibitor, functional:

Concentration: 0.75-1.59 IU/mL!!!

Methodology: Chromogenic!!!

Interpretation of results

↓ Congenital or acquired angioedema

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