Thus, the statistical analysis of the obtained test results revealed the presence of significant associations between the amount of urinary excretion of sGAGs and the value of serum CRP concentration in healthy children [(C), (r = 0.5108; p = 0.0039)], in the patients with remission of JIA vs. those being treated with MTX, SSA, and EC [(TR), (r = 0.7742; p = 0.00001)], and in the patients after two years of ETA therapy [(T24), (r = 0.7377; p = 0.0000)]. Here, CRP is linked to juvenile idiopathic arthritis.