Which of the following symptoms indicates a need for immediate medical attention in a patient?

Abnormal or labored breathing is a critical symptom that indicates a need for immediate medical attention. This type of breathing can signify underlying respiratory distress, which may lead to inadequate oxygenation of the blood and organs, potentially resulting in life-threatening situations if not addressed promptly.

In contrast, a Glasgow Coma Scale (GCS) of 15 indicates that the patient is fully awake and alert with no neurological impairment. Alcohol ingestion without impairment suggests that the patient is functioning normally and does not require immediate intervention. A patient at their baseline condition means that they are stable and functioning as they normally do, thus not needing urgent medical care. All these conditions do not present the same level of immediate danger to the patient as abnormal or labored breathing.