Complement activation is a key feature of systemic lupus erythematosus (SLE). Detection of cell-bound complement activation products (CB-CAPS) occurs more frequently than serum hypocomplementemia in definite lupus. We describe a patient with normocomplementemic probable SLE who did not fulfill ACR classification criteria for lupus, but the diagnosis was supported by the presence of CB-CAPS.
Keywords: Systemic lupus erythematosus (SLE); cell-bound complement activation products (CB-CAPS); complement; neuromyelitis optica (NMO).
© The Author(s) 2016.