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Prioritize by immediacy of clinical impact and strict timing. A STAT ABG often reflects acute respiratory/metabolic instability and requires immediate anaerobic handling and rapid analysis; draw first (and send promptly with air expelled, on ice if validated). Next, complete the precisely timed vancomycin PEAK at 12:00; peak timing is critical for interpretation in many protocols—coordinate with nursing to confirm infusion stop/time. Afterward, collect the STAT ammonia (on ice, rapid separation) and finally the routine wellness labs. Thus, Option B—1 → 2 → 3 → 4—balances emergent status with exact timing. Some institutions might place the STAT ammonia before the peak if the ABG is stabilized and timing windows differ; however, in most cases ABG data drive immediate bedside decisions, while a well-coordinated peak can still be obtained promptly after. Always document exact collection times, communicate any unavoidable delays, and meet each test’s handling requirements. Mastering triage under time pressure is central to phlebotomy workflow competence and exam performance.