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ModerateEndocrinologyDiabetic ketoacidosisuk-plab-1

A 22-year-old man with type 1 diabetes presents with abdominal pain, vomiting and drowsiness. Capillary glucose is 29 mmol/L, ketones 5.5 mmol/L and venous pH 7.09. He is tachycardic and mildly hypotensive. According to UK DKA management protocols, what is the single most important first treatment step?

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