Functional assays for C1 inhibitor (chromogenic or EIA) are expressed as the percentage of the mean level in normal specimens rather than as a mass concentration. The mass concentration of C1 inhibitor in a subject with low C1 inhibitor function may be low or normal depending on whether the patient has normal amounts of a dysfunctional protein.
4476-8 Complement Cl esterase inhibitor.functional [Mass/volume] in Serum or Plasma may be incorrect
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