Serum values: sodium 142, chloride 102, bicarbonate 12 mmol/L. What is the anion gap?
Answer and explanation
Correct answer: B. 28 mmol/L
- Step 1: Anion gap = Na - (Cl + HCO3).
- Step 2: 142 - (102 + 12) = 28 mmol/L.
Answer
28 mmol/L.
Why not the others: 40 leaves out bicarbonate and 114 is the sum of the measured anions, not the gap.
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