A 7-year-old boy is brought to the emergency department because he has been breathing hard since the morning. He has vomited repeatedly for two days and says his abdomen is sore; it is soft and generally tender with no guarding. He is drowsy but rousable. His respiratory rate is 36, deep and unlaboured, with no recession and no added sounds. Oxygen saturation 99% in air, heart rate 138, temperature 36.8 degrees Celsius. Which one of the following investigations will explain his breathing most quickly?
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Filed under paediatrics › endocrinology-and-growth › diabetes-mellitus › diabetes-mellitus

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