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As a consultant for a conscious sedation consulting firm, I receive this question often. The gold standard set by the American Society of Anesthesiologists is as follows: Summary of American Society of Anesthesiologists Preprocedure Fasting Guidelines2* Ingested Material Minimum Fasting Period† Clear liquids‡ 2 h Breast milk 4 h Infant formula 6 h Nonhuman milk§ 6 h Light meal 6 h * These recommendations apply to healthy patients who are undergoing elective procedures. They are not intended for women in labor. Following the Guidelines does not guarantee a complete gastric emptying has occurred. † The fasting periods apply to all ages. ‡ Examples of clear liquids include water, fruit juices without pulp, Carbonated Beverages, clear tea, and black coffee. § Since nonhuman milk is similar to solids in gastric emptying time, the amount ingested must be considered when determining an appropriate fasting period. A light meal typically consists of toast and clear liquids. Meals that include fried or fatty foods or meat may prolong gastric emptying time. Both the amount and type of foods ingested must be considered when determining an appropriate fasting period. PRACTICE GUIDELINES 1007 Anesthesiology, V 96, No 4, Apr 2002

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Q: Number of hours NPO for conscious sedation procedures eg colonoscopy?
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