Fasting Guideline

Fasting guidelines of international anesthesia societies

Country, yearFasting requirements at time of inductionComments
American Society of Anesthesiologists, 2011* 2 hours clear liquidsHealthy patients, elective surgery, pregnant patients not in labor
6 hours nonhuman milk, light mealLight meal defined as toast or cereal with clear liquid
8 hours or more fried or fatty food or meat
European Society of Anesthesiology, 20112 hours clear liquids
6 hours solid food

Chewing gum and sucking hard candy allowed up until time of induction Applies to patients with obesity, diabetes, GERD, nonlaboring pregnant patients Encourages oral fluid up to 2 hours prior to induction

Canadian Anesthesiologists' Society, 20142 hours clear liquids
6 hours light meal or nonhuman milk
8 hours meat, fried or fatty food
Association of Anaesthetists in Great Britain and Ireland, 20012 hours clear liquidsGum chewing should be treated as clear
6 hours solid food and nonhuman milk
Scandinavian Society of Anaesthesiology and Intensive Care Medicine, 20052 hours clear liquidsUp to 1 hour prior to induction, 150 mL water
6 hours solid food and milk
2 hours chewing gum and any form of tobacco

2 hours for preoperative carbohydrate drinks intended for preoperative nutrition

German Society of Anesthesiology and Intensive Care, 20082 hours clear liquids
6 hours meal
Ingested MaterialMinimum Fasting Period
Clear liquids2 h
Breast milk4 h
Infant formula6 h
Nonhuman milk6 h
Light meal6 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 complete gastric emptying.
The fasting periods noted above apply to patients of all ages.

  • Examples of clear liquids include water, fruit juices without pulp, carbonated beverages, clear tea, and black coffee.
  • Because nonhuman milk is similar to solids in gastric emptying time, the amount ingested must be considered when determining an appropriate fasting period.
  • light meal typically consists of toast and clear liquids.
  • Meals that include fried or fatty foods or meat may prolong gastric emptying time. Additional fasting time (e.g., 8 h or more) may be needed in these cases. Both the amount and type of food ingested must be considered when determining an appropriate fasting period.
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  • 上一次變更: 2015-03-17 07:43
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