Serum values: sodium 140, chloride 100, bicarbonate 10 mmol/L. What is the anion gap?
Answer and explanation
Correct answer: B. 30 mmol/L
- Step 1: Anion gap = Na - (Cl + HCO3).
- Step 2: 140 - (100 + 10) = 30 mmol/L.
Answer
30 mmol/L.
Why not the others: 40 leaves out bicarbonate and 110 is the sum of the measured anions, not the gap.
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