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Hyponatremia         Serum Osmolality       <280mEq/L 280-295mEq/L >295mEq/L     Hypotonic Hyponatremia Isotonic Hyponatremia Hypertonic Hyponatremia     Assess Volume Status Causes: Excessive lipids and proteins (ex. Hypertriglyceridemia, Hyperlipidemia Causes: Hyperglycemia, Mannitol   Low Normal High     Measure Urine Na+ Psychogenic Polydipsia, SIADH, Drugs, Hypothyrodism, Glucocorticoid Deficiency Measure Urine Na+