Laboratory studies indicate a patient's blood sugar level is 185 mg/dL. Two hours have passed since the patient ate breakfast. Which test would yield the most conclusive diagnostic information about the patient's glucose utilization?
A) A fasting blood sugar
B) A 6-hour glucose tolerance test
C) A test of serum glycosylated hemoglobin (Hb A1c)
D) A test for urine ketones
Ans: C
Feedback: Hb A1c is the most reliable indicator of glucose utilization because it reflects blood
sugar levels for the previous 3 months. While a fasting blood sugar and 6-hour glucose tolerance test yield information about a patient's utilization of glucose, the results will be influenced by other factors such as whether the patient recently ate breakfast. Presence of ketones in the urine also provides information about glucose utilization but is limited in its diagnostic significance.
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