An 8-year-old child has low-grade fever, arthritis, colicky abdominal pain and a purpuric rash localized on the lower extremities. Laboratory studies reveal a guaiac-positive stool, urinalysis with red blood cell (RBC) casts and mild proteinuria, and a normal platelet count. The most likely diagnosis is:

Answer options

1. Poststreptococcal glomerulonephritis
2. Systemic lupus erythematosus (SLE)
3. Henoch-Schonlein’s vasculitis
4. Rocky Mountain spotted fever
5. Idiopathic thrombocytopenic purpura

Explanation

An 8 year old child has low-grade fever, arthritis, colicky abdominal pain and a purpuric rash llocalized on the lower extremities. laboratory studies reveal a guaiac-positive stool, urinalysis with red blood cell (RBC) casts and mild proteinuria, and a normal platelet count. The most likely diagnosis is:Henoch-Schonlein's vasculitis = called also Henoch–Schlein Purpura or vasculitis (HSP), or anaphylactoid purpurasystemic lupus erythematosus (SLE) = butterfly rashRocky Mountain spotted fever = hemorrhagic fever/ Rickettsia rickettsii, rash appear in wrist and ankle then palms and soles then spread centrally to the trunk and face (mostly north and south America)Idiopathic thrombocytopenic purpura = platelets DOWNPoststreptococcal glomerulonephritis = no sign of the previous infection here, like tonsillitis. As well as no glomerulonephritis **stool guaiac-positive this test to detect blood with stool