## ASA Definition of Clear Liquids **Key Point:** Clear liquids are defined as liquids through which you can see light. They do not contain milk, pulp, or particles that may obstruct visualization or delay gastric emptying. ### Permitted Clear Liquids (2-hour fasting) - Water - Clear fruit juices (apple, white grape, cranberry — **without pulp**) - Black coffee or tea (without milk or cream) - Clear broths (beef, chicken, vegetable — **without particles**) - Sports drinks (Gatorade, Powerade) - Hard candy (lollipops) - Gelatin (clear, non-red/purple) ### NOT Permitted Clear Liquids - Milk or cream-based beverages - Pulpy or opaque juices (orange juice with pulp, tomato juice) - Alcohol - Fatty broths - Honey or sugar syrups (increase gastric pH buffering) **High-Yield:** Black coffee without additives is explicitly allowed up to 2 hours preoperatively. This is frequently tested because many patients assume all coffee is prohibited. **Clinical Pearl:** The 2-hour fasting period for clear liquids is based on rapid gastric emptying kinetics. Clear liquids leave the stomach within 90–120 minutes in healthy individuals, making them safe even with shorter fasting intervals. **Mnemonic:** **"See Through" Rule** - If you can **see light through it**, it's a clear liquid - If it's **opaque or colored**, it requires longer fasting (6–8 hours)
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