The nurse is teaching a client about fasting blood glucose levels and an oral glucose tolerance test. Which of the following should be included in the teaching?
• "You must fast before each of the tests for 8 to 10 hours.".
• "You must fast 8 hours before the fasting blood glucose test, and then eat a large meal, after which your blood glucose is measured.".
• "The fasting glucose must be 123 or under to be normal.".
• "The 2-hour glucose tolerance test must be over 140 to be considered normal.".
"You must fast before each of the tests for 8 to 10 hours.".
Rationale: A fasting blood glucose level requires the client to fast for 8 to 12 hours prior to the test. A glucose tolerance test involves both a fasting blood glucose level and ingesting a known quantity of glucose with measurement of the blood glucose at ½, 1, and 2 hours. Fasting for 8 hours and then eating a large meal describes a postprandial blood glucose test. The normal value for fasting glucose is 60 to 100 mg/dL. The normal result of a 2-hour glucose tolerance test should be a value of <140 mg/dL.
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