History
Recent URI or skin infection (strep)
Rash, arthralgia (HSP, SLE)
Fever, vomiting, diarrhea (HUS)
Often associated with hypertension
Recent URI or skin infection (strep)
Rash, arthralgia (HSP, SLE)
Fever, vomiting, diarrhea (HUS)
Glomerulonephritis
Urologic 
Pyelonephritis
Any location
Renal abscess
Iatrogenic/postprocedure
Acute cystitis
GU trauma