Acute hyponatremia becomes symptomatic at
Severe symptoms (e.g., coma, seizures) typically occur when the sodium level falls below 120 mEq per L, but can occur at less than 125 mEq per L. Severe symptomatic hyponatremia must be corrected promptly because it can lead to cerebral edema, irreversible neurologic damage, respiratory arrest, brainstem herniation, Ref Davidson 23rd edition pg 350
<135 mEq
<125 mEq
<120 mEq
<115 mEq
Fluid and electrolytes