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Department of Immunology Notes Immunochemical C1 esterase inhibitor is assessed along with complement C3 and C4.
Very low C4 in isolation can be associated with C1 inhibitor deficiency. If C4 is normal, C1 inhibitor deficiency is very unlikely.
C1-esterase inhibitor
Upchurch E, Old OJ, Lloyd GR, Isabelle M, Kendall C1, Shetty G, Pavlou A, Shepherd N, Barr H.