<prompt> Acute hyponatremia becomes symptomatic at what level of serum sodium concentration?130mEqL125 mEqL120 mEqL115 mEqL  <response>: Ans. is c i.e., 120 mEqL Acute Hyponatremia Cases of acute hyponatremia are defined as those developed in 48 hours of duration. These patients are usually symptomatic if hyponatremia is severe i.e. 120mEqL. These patients are at greatest risk of development of neurologic symptoms but rarely develop demyelination. Sodium levels in these patients should be corrected to relatively higher levels quickly. 