HealthHyponatremia
A SelectSmart.com Flowchart by Tasha Duval
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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+