Table 2.

Classifications of hypernatremia

Criteria	Classification	Value
Absolute serum sodium concentration	Mild	146–150 mmol/L
	Moderate	151–155 mmol/L
	Severe	> 155 mmol/L [38]
	Extreme	> 190 mmol/L [3]
Time of development (cutoff 48 hours)	Acute vs. Chronic
Clinical assessment of volume status	Hypovolemic
	Euvolemic
	Hypervolemic