A 17-year-old client at 30 weeks’ gestation with pregestatio…

A 17-yeаr-оld client аt 30 weeks' gestаtiоn with pregestatiоnal type 1 diabetes mellitus presents for a prenatal follow-up visit. The nurse reviews the following laboratory results: Test Result Fasting Blood Glucose 92 mg/dL Random Blood Glucose 168 mg/dL Urine Ketones Negative Hemoglobin A1c 8.1% Serum Creatinine 0.8 mg/dL The healthcare provider asks the nurse which laboratory value provides the most reliable assessment of glycemic control over the previous several weeks and is most predictive of the risk for fetal complications associated with maternal hyperglycemia. Which response by the nurse is most appropriate?