A client's serum chemistry measurements are serum sodium level 146 mEq/L, BUN 24 mg/dl, and glucose level 90 mg/dl. What is the client's serum osmolality?
a. 275 mOsm/kg
b. 285 mOsm/kg
c. 295 mOsm/kg
d. 305 mOsm/kg
ANS: D
To calculate osmolality, use the equation:
2(serum Na concentration) + BUN/3 + glucose level/18.
2(146) + 24/3 + 90/18 = 305 mOsm/kg.
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