The Nurse Is Providing Care to a School-Age Child Admitted

The nurse is providing care to a school-age child admitted because of the presence of colicky abdominal pain, palpable purpura on the lower extremities, edema of the face and lips, and anorexia. The suspected diagnosis is Henoch-Schönlein purpura. Which diagnostic test result does the nurse expect to validate the diagnosis?

A) Elevated serum creatinine
B) Positive for proteinuria
C) Stool positive for occult blood
D) Renal biopsy shows IgA deposition