Which of the following indicates hypoglycemia?

Hypoglycemia is defined as an abnormally low level of glucose in the blood. When the blood sugar drops below normal levels, various physiological symptoms may occur as the body reacts to this deficiency. The correct identification of low blood sugar directly correlates with hypoglycemia, as it signifies that the body's glucose levels are insufficient for normal metabolic function.

High blood sugar is indicative of hyperglycemia, while a sweet, fruity smell on the breath suggests the presence of ketones, which typically occurs in conditions like diabetic ketoacidosis, not hypoglycemia. Increased thirst can often be associated with high blood sugar levels, where the body attempts to eliminate excess glucose through urination, thus leading to dehydration. Understanding these distinctions is crucial for recognizing the signs of hypoglycemia specifically.