Which NPO category includes infant formula and non human milk?

• A. Up to 8 hours
• B. Up to 6 hours
• C. Up to 4 hours
• D. During the 2 hours until surgical times

Answer: (B)

The key idea is that preoperative fasting times depend on what was last eaten, because different foods empty from the stomach at different rates to minimize aspiration risk during anesthesia. Infant formula and nonhuman milk stay in the stomach longer than clear liquids or human milk, so the safest and most common guideline is to fast for up to six hours after giving these. That’s why the category that includes infant formula and nonhuman milk is up to six hours before anesthesia. For context, clear liquids are usually allowed up to two hours, breast milk up to four hours, and solids (or heavy meals) often require longer—around eight hours in many protocols—which helps explain why six hours is the correct match for formula and nonhuman milk.