This is the first report on midkine (MK) in children with HSP.
Serum midkine level was elevated at the onset of the disease in children with HSP.
There is an abnormal production of cytokines in children with HSP.
MK positively correlated with IL-4, IL-6, IL17A, IgA and IgE.
MK could be used as an efficient indicator for an early diagnosis of HSPN.