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Two items are both time-critical: pre-antibiotic cultures and a precisely timed gentamicin peak (10:00). The defensible sequence is to collect the blood cultures FIRST (Option 1) so therapy can begin promptly and to avoid antibiotic suppression of culture yield, then move directly to the 10:00 gentamicin PEAK (Option 3)—confirm infusion stop time with nursing to ensure true peak timing. Next, draw the STAT lactate (Option 2) with proper handling (minimal stasis, on ice, rapid separation), followed by routine wellness labs (Option 4). Thus, Option D (1 → 3 → 2 → 4) balances antimicrobial stewardship, exact pharmacokinetic timing, and critical care needs. Some institutions might reverse 2 and 3 if the peak window is wider or if the lactate reflects an immediate resuscitation decision; however, with a peak due in 10 minutes, it is prudent to secure cultures and arrive on time for the peak. Communicate ETA to units, request help if needed, and document exact collection times for all timed and STAT tests.