Poor prognostic risk factors:
Creatinine > 1.4mg/dL
Platelets < 60k
Altered mental status
Shock
Urological consult for percutaneous drainage, stent placement, or nephrectomy (classes 3 and 4 with 2 or more prognostic risk factors)
Presence of obstructive stone requires even more urgent surgical intervention
Mortality rates between ~20-40%
Creatinine > 1.4mg/dL
Platelets < 60k
Altered mental status
Shock
Emphysematous pyelonephritis
Genitourinary infection
Pyelonephritis
Acute cystitis 
Renal abscess
Acute cystitis
Urethritis
Glomerulonephritis