National Dental Examining Board of Canada (NDEB) Practice Exam

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What is the minimally acceptable percentage of oxygen in a safe GA mixture?

  1. 20%

  2. 50%

  3. 30%

  4. 40%

The correct answer is: 20%

The minimally acceptable percentage of oxygen in a safe GA mixture is 20%. This percentage ensures that there is enough oxygen in the mixture to maintain adequate levels for respiration. Options B, C, and D are incorrect because they are higher percentages and could lead to hyperoxia, a condition in which there is too much oxygen in the body. This can cause problems for individuals with certain medical conditions, such as chronic obstructive pulmonary disease (COPD).

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