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C1 esterase inhibitor (Quantitation and functional assays)

About This Test

Department: Immunology

Requirement: Complement C3 and C4 levels should also be measured.

Turnaround Time: 10 days

Low levels of C1 esterase inhibitor are associated with hereditary and acquired angioedema. Normal C4 during an attack of angioedema excludes hereditary angioedema. If C4 is normal C1 inhibitor is not tested, however if you have a high index of suspicion please contact the laboratory. Patients should be referred to Consultant Immunologist

Other Comments:

Quantitative ref range = 0.15 -0.35 g/L Functional ref range = 70-150%