Select the most appropriate adult reference range for fasting blood glucose.
A. 65–99 mg/dL (3.61–5.50 mmol/L)
B. 40–105 mg/dL (2.22–5.82 mmol/L)
C. 60–140 mg/dL (3.33–7.77 mmol/L)
D. 75–150 mg/dL (4.16–8.32 mmol/L)
A. 65–99 mg/dL (3.61–5.50 mmol/L) Reference ranges vary slightly depending upon method and specimen type. Enzymatic methods speciﬁc for glucose have an upper limit of normal no greater than 99 mg/dL. This is the cutoﬀ value for impaired fasting plasma glucose (prediabetes) recommended by the American Diabetes Association. Although 65 mg/dL is considered the 2.5 percentile, a fasting level below 50 mg/dL is often seen without associated clinical hypoglycemia, and neonates have a lower limit of approximately 40 mg/dL owing to maternal insulin.
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