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
- Primary watergain followed by secondary Sodium gain
- Urine Osmolarity higher
- Uricosuria- Hypouricemia
- Euvolemia
Secondary Hyperaldosteronism
Primary sodium gain exceeded by secondary water gain.
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