Which statement correctly contrasts conventional and rapid time frames?

• A. Conventional 24-48h; Rapid 24-48h
• B. Conventional 2h; Rapid 48-72h
• C. Conventional 48-72h; Rapid 2h or less
• D. Conventional 3-5 days; Rapid 24-48h

Answer: (C)

Turnaround time is being tested: conventional culture-based antimicrobial susceptibility testing typically needs extended incubation to observe growth, while rapid diagnostics are designed to deliver results in hours. The option that pairs conventional results at 48–72 hours with rapid results at 2 hours or less fits this contrast best, reflecting how much faster rapid methods can provide actionable information. The other choices fail to show the expected speed gap: one option implies no difference in time; another wrongly places conventional testing at around 2 hours; and the remaining option uses a conventional window (3–5 days) that isn’t the standard contrast used with rapid methods.