Which condition is characterized by elevated blood glucose levels after fasting?

Fasting hyperglycemia specifically refers to elevated blood glucose levels that occur after a period of fasting, typically defined as not eating for at least 8 hours. This condition is often a key point in diagnosing various forms of diabetes or metabolic impairment. When blood glucose remains elevated during fasting, it suggests that the body's insulin response is inadequate or that there is increased hepatic glucose production.

While diabetes mellitus encompasses a broader spectrum of high blood sugar conditions, it does not exclusively define the state of hyperglycemia during fasting. Impaired fasting glucose can be considered a precursor to diabetes but does not distinctly characterize the condition of elevated glucose levels specifically after fasting. Reactive hypoglycemia, on the other hand, involves low blood sugar that occurs after eating, not fasting.

Thus, the term "fasting hyperglycemia" directly and accurately describes the condition in question, as it focuses specifically on the phenomenon of elevated glucose levels that arise after a fasting state.