In prerenal azotemia, tubular function is preserved and sodium reabsorption increases with the associated renal vasoconstriction. Hence the FENa is usually <1% in prerenal azotemia. A high FENa in the context of prerenal azotemia is possible during diuretic treatment and glycosuria. FEurea is of value in states of reduced effective circulating volume, and in cases where diuretics have been administered. In these situations, a low FEurea (<35%) has a higher sensitivity and specificity than FENa in differentiating between prerenal azotemia and renal AKI.
Acute kidney injury laboratory findings
Acute renal failure laboratory findings
Acute liver failure laboratory findings
Acute kidney injury physical examination
Nephrotic syndrome physical examination
Nephrotic syndrome laboratory findings
Acute renal failure ultrasound
Papillorenal syndrome physical examination