II. Normal
- 50-1200 mOsm/kg
III. Increased
- Syndrome Inappropriate ADH Secretion (SIADH)
- Dehydration
- Glycosuria
- Adrenal Insufficiency
- High protein diet
IV. Decreased
- Diabetes Insipidus
- Excessive hydration (oral or intravenous)
- Acute Renal Insufficiency
- Glomerulonephritis