Hyponatremia

Osmolality

All conditions causing hyponatremia are hypo osmolar except

Pseudohyponatremia

  • hyperlipidemia
  • hypoproteinemia
  • Hyperglycemia

ECF volume

Normal in SIADH,Adrenal insufficiency,Hypothyroidism

Increased in Secondary hyperaldosteronism,CHF,Nephrotic syndrome,Cirrhosis

Urine Sodium>20mmol/L

Hypoaldosteronism,saltwasting nephropathy,recent diuretics

SIADH

  1. Primary watergain followed by secondary Sodium gain
  2. Urine Osmolarity higher
  3. Uricosuria- Hypouricemia
  4. Euvolemia

Secondary Hyperaldosteronism

Primary sodium gain exceeded by secondary water gain.

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