Serum concentrations of sCD30 in patients with mastocytosis. Serum levels of sCD30 were determined in 10 normal (healthy) donors (ND), 6 patients with CM, 25 with ISM, 3 with ASM, and 2 with MCL. sCD30 levels were quantified using a commercial ELISA. The detection limit of this assay was found to be 6.4 ng/mL. Results represent sCD30 levels in each cohort (patients or controls) and represent the mean ± standard deviation (SD) of all donors in each group. *P < .05.