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Blood gases, electrolytes and interpretation 2. Electrolytes (In Practice, March 2013, volume 35, pp 115–121; doi: 10.1136/inp.f955)
On page 117 in Fig 1, the caption should read ‘Differences in the plasma cations and anions in alkalosis, normal and acidosis patients. The major cations in the plasma are sodium (Na+) and potassium (K+), but potassium is often excluded from the calculation of anion gap as serum values do not tend to vary significantly. The major anions are chloride (Cl−) and bicarbonate (bicarb); there are also anions that cannot be measured by today's analysers (UA−) . . . ’ The error is regretted.
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