Which serum sodium value indicates mild hyponatremia?
A. 148 mEq/L (mmol/L)
B. 138 mEq/L (mmol/L)
C. 128 mEq/L (mmol/L)
D. 118 mEq/L (mmol/L)
C
The normal range for serum sodium levels among healthy adults between the ages of 18 and 60 years is 136 to 145 mEq/L (mmol/L). Although both C and D indicate low levels of sodium, 118 mEq/L represents a severe hyponatremia.
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