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Sodium 142 mmol/L (normal range 134-146 mmol/L)

Potassium 3.7 mmol/L (normal range 3.4-5.0 mmol/L)

Calcium 2.18 mmol/L (normal range 2.15-2.60 mmol/L)

Electrolytes disturbance (eg hyponataemia) is a common cause of confusion, but not in Dr Zheng’s case – his results are within normal range.