What is a contraindication for administering oral glucose?

Administering oral glucose is contraindicated in situations where a patient is unable to protect their airway, which is the case when they cannot control their airway due to altered consciousness or swallowing difficulties. If a patient cannot maintain their airway, giving oral glucose could lead to aspiration, which could cause severe respiratory complications.

Active seizures pose a risk as well because the patient is unconcious, potentially affecting their ability to swallow and protect their airway. Head injuries can also complicate the situation, particularly if there is swelling or bleeding in the brain that could affect consciousness. Altered mental status signifies some level of compromise, indicating the patient may not be able to swallow safely.

In summary, the key factor that makes the inability to control the airway a clear contraindication is the critical risk of aspiration, making it the correct answer in this scenario regarding the safety of administering oral glucose.