There are several potential reasons why an individual's glucose levels may be high despite having a relatively low A1C. A1C is an average measure of blood glucose levels over a period of two to three months, whereas glucose levels fluctuate on a daily basis. It is possible that the individual may have had temporary spikes in blood glucose levels during the two- to the three-month period that was not reflected in the overall A1C measurement. Additionally, A1C is affected by both glucose and hemoglobin, so if the individual has a higher amount of hemoglobin, this can lower their A1C even if their glucose levels are high. Other factors, such as stress, illness, and certain medications, can also temporarily raise glucose levels. It is important to consult with a healthcare professional to determine the specific cause and to manage and monitor diabetes effectively.