Serum values: sodium 140, chloride 104, bicarbonate 24 mmol/L. What is the anion gap?
Answer and explanation
Correct answer: C. 12 mmol/L
- Step 1: Anion gap = Na - (Cl + HCO3).
- Step 2: 140 - (104 + 24) = 12 mmol/L.
Answer
12 mmol/L.
Why not the others: 36 leaves out bicarbonate and 128 is the sum of the measured anions, not the gap.
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