Euvolemia (no edema)

Total body water
Total body sodium !!LtArrow!!!!RtArrow!!

Hypervolemia

Total body water
Total body sodium

U_Na >20

Glucocorticoid deficiency
Hypothyroidism
Stress
Drugs
Syndrome of inappropriate antidiuretic hormone secretion

Nephrotic syndrome
Cirrhosis
Cardiac failure

Acute or chronic renal failure

U_Na >20

U_Na <20

Renal losses
Diuretic excess
Mineral corticoid deficiency
Salt-losing deficiency
Bicarbonaturia with renal tubal acidosis and metabolic alkalosis
Ketonuria
Osmotic diuresis
Cerebral salt wasting syndrome

Extrarenal losses
Vomiting
Diarrhea
Third spacing of fluids
Burns
Pancreatitis
Trauma

U_Na >20

U_Na <20