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The fasting blood glucose level is :

  • A.50 to 80 mg/dl
  • B.70 to 110 mg/dl
  • C.80 to 120 mg/dl
  • D.130 to 140 mg/dl

Answer: B

The keyed range is 70 to 110 mg/dl.

Textbooks of nutrition and biochemistry give the normal fasting blood glucose as about 70 to 110 mg/dl, measured after an overnight fast of 8 to 10 hours. Current diagnostic criteria set a tighter upper limit, treating 100 to 125 mg/dl as impaired fasting glucose and 126 mg/dl or more as diabetes, but 70 to 110 is the standard range the question uses.

50 to 80 mg/dl runs into hypoglycaemia, 80 to 120 sets the upper limit too high, and 130 to 140 mg/dl would be diagnostic of diabetes.

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