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For fasting labs, the goal is a stable metabolic baseline. Standard guidance is to consume no calories for 8–12 hours prior to collection, while water is allowed to maintain hydration and facilitate venipuncture. Patients should avoid alcohol for ~24 hours and strenuous exercise the morning of the test, both of which can alter triglycerides and glucose. Continue routine medications unless the provider specifies otherwise (exceptions may include biotin for certain immunoassays or test-specific drugs). Option B accurately summarizes these instructions. Absolute fluid restriction (Option A) risks dehydration and difficult draws. Coffee—especially with cream/sugar—breaks the fast (Option C). Fasting for 24 hours (Option D) is unnecessary and may cause hypoglycemia or other adverse effects. The phlebotomist should verify adherence at the bedside and document deviations so clinicians can interpret results appropriately or reschedule if needed.