In a patient with diabetes and altered mental status, what is the most immediate action?

• A. Check blood glucose level
• B. Order chest X-ray
• C. Administer IV fluids for dehydration only
• D. Obtain a CT head scan

Answer: (A)

The most immediate action is to rapidly check the patient's blood glucose with a bedside meter. In a diabetic patient with altered mental status, hypoglycemia is a common, rapidly reversible cause of AMS. Getting a glucose reading right away tells you whether the brain is being deprived of fuel and what to do next.

If the reading is low (hypoglycemia), treat immediately with fast-acting glucose (or IV dextrose if the patient is unconscious or unable to swallow). If the glucose is normal or high, you can move on to other urgent causes (such as stroke, infection, metabolic derangements) while continuing the evaluation.

Chest X-ray, CT head, or giving IV fluids for dehydration alone don’t address the likely, quickly reversible problem and can delay definitive treatment.