The 16-year-old patient presents to the emergency department (ED) complaining of a headache, fever, malaise, and nuchal rigidity. The patient is found to have a fever of 106°F, heart rate 132 bpm, and blood pressure 135/62 mmHg. A complete blood count is normal with the exception of leukocytosis. Additional assessment reveal sunsetter eyes and papilledema. Which test, if instructed to perform first, prompts the nurse to question the order?

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