Majority of cases of community-acquired ARF is secondary to volume depletion although consideration of pre-renal, post renal, and renal causes are important.
Useful if patient's baseline creatinine is unknown
Stage 1:<unk>  damage (e.g. proteinuria) and normal GFR; GFR >90
Stage 2:<unk>  damage (e.g. proteinuria) and mild decrease in GFR; GFR 60-89
Stage 3: Moderate decrease in GFR; GFR >30-59
Stage 4: Severe decrease in GFR; GFR 15-29
Stage 5:<unk>  failure (dialysis or<unk>  transplant needed); GFR <15
Stage 1:<unk>  damage (e.g. proteinuria) and normal GFR; GFR >90
Stage 2:<unk>  damage (e.g. proteinuria) and mild decrease in GFR; GFR 60-89
Stage 3: Moderate decrease in GFR; GFR >30-59
Stage 4: Severe decrease in GFR; GFR 15-29
Stage 5:<unk>  failure (dialysis or<unk>  transplant needed); GFR <15
Radiocontrast agents
Especiallyif GFR <60, hypovolemic
Atherosclerosis
Chronic hypertension
Chronic<unk>  disease
NSAIDs
ACEI/ARB
Sepsis
Hypercalcemia
Hepatorenal syndrome
Especiallyif GFR <60, hypovolemic
Acute kidney injury
Acute hepatic failure
Acute urinary retention
Tumor lysis syndrome
Hepatorenal syndrome
Adrenal crisis
Renal infarction
Diabetes insipidus