GLUCOSE REVIEW TEST QUESTIONS AND
ANSWERS
Following overnight fasting, hypoglycemia in non-diabetic adults is defined as a
glucose of: - ANSWER ≤55 mg/dL
Interpret these results from a 21-year-old patient with a back injury who appears
otherwise healthy:
- WB glucose = 77 mg/dL
- Serum glucose = 88 mg/dL
- CSF glucose = 56 mg/dL
A. the WB and serum values are expected but the CSF value is elevated
B. the WB glucose value should be higher than the serum value
C. all values are consistent with a normal healthy individual
D. the serum and WB values should be identical - ANSWER C. all values are
consistent with a normal healthy individual
fasting WB is 10-15% lower than plasma glucose - more cellular consumption
in WB vs no cells in plasma
The preparation of a patient for standard glucose tolerance testing should
include:
A. a high carb diet for 3 days
B. a low carb diet for 3 days
C. fasting for 48 hours prior to testing
D. bed rest for 3 days - ANSWER A. a high carb diet for 3 days
"unrestricted diet" with at least 150g of carbs per day
If a fasting glucose is 90 mg/dL, which of these 2-hour postprandial glucose
results would most closely represent normal glucose metabolism?
A. 55 mg/dL
B. 100 mg/dL
C. 180 mg/dL
D. 260 mg/dL - ANSWER B. 100 mg/dL
, Postprandial value should return to fasting state around 2 hours after eating
A healthy person with a blood glucose of 80 mg/dL would have a
simultaneously determined CSF glucose value of:
A. 25 mg/dL
B. 50 mg/dL
C. 100 mg/dL
D. 150 mg/dL - ANSWER B. 50 mg/dL
CSF glucose is ~60% of blood glucose
A 25-year-old man became nauseated and vomited 90 minutes after receiving a
standard 75g carb dose for an oral glucose tolerance test. The best course of
action is to:
A. give the patient a glass of orange juice and continue the test
B. start the test over immediately with a 50 g carb dose
C. draw blood for glucose and discontinue testing
D. place the patient in a recumbent position, reassure him, and continue the test
- ANSWER C. draw blood for glucose and discontinue testing
partial info is still useful but patient safety is most important
CSF for glucose assay should be:
A. refrigerated
B. analyzed immediately
C. heated to 56ºC
D. stored at room temperature after centrifugation - ANSWER B. analyzed
immediately
Which of these 2-hour postprandial glucose values demonstrates unequivocal
hyperglycemia diagnostic for diabetes mellitus?
A. 160 mg/dL
B. 170 mg/dL
C. 180 mg/dL
D. 200 mg/dL - ANSWER D. 200 mg/dL
Serum levels that define hypoglycemia in preterm or low birth weight infants
are:
ANSWERS
Following overnight fasting, hypoglycemia in non-diabetic adults is defined as a
glucose of: - ANSWER ≤55 mg/dL
Interpret these results from a 21-year-old patient with a back injury who appears
otherwise healthy:
- WB glucose = 77 mg/dL
- Serum glucose = 88 mg/dL
- CSF glucose = 56 mg/dL
A. the WB and serum values are expected but the CSF value is elevated
B. the WB glucose value should be higher than the serum value
C. all values are consistent with a normal healthy individual
D. the serum and WB values should be identical - ANSWER C. all values are
consistent with a normal healthy individual
fasting WB is 10-15% lower than plasma glucose - more cellular consumption
in WB vs no cells in plasma
The preparation of a patient for standard glucose tolerance testing should
include:
A. a high carb diet for 3 days
B. a low carb diet for 3 days
C. fasting for 48 hours prior to testing
D. bed rest for 3 days - ANSWER A. a high carb diet for 3 days
"unrestricted diet" with at least 150g of carbs per day
If a fasting glucose is 90 mg/dL, which of these 2-hour postprandial glucose
results would most closely represent normal glucose metabolism?
A. 55 mg/dL
B. 100 mg/dL
C. 180 mg/dL
D. 260 mg/dL - ANSWER B. 100 mg/dL
, Postprandial value should return to fasting state around 2 hours after eating
A healthy person with a blood glucose of 80 mg/dL would have a
simultaneously determined CSF glucose value of:
A. 25 mg/dL
B. 50 mg/dL
C. 100 mg/dL
D. 150 mg/dL - ANSWER B. 50 mg/dL
CSF glucose is ~60% of blood glucose
A 25-year-old man became nauseated and vomited 90 minutes after receiving a
standard 75g carb dose for an oral glucose tolerance test. The best course of
action is to:
A. give the patient a glass of orange juice and continue the test
B. start the test over immediately with a 50 g carb dose
C. draw blood for glucose and discontinue testing
D. place the patient in a recumbent position, reassure him, and continue the test
- ANSWER C. draw blood for glucose and discontinue testing
partial info is still useful but patient safety is most important
CSF for glucose assay should be:
A. refrigerated
B. analyzed immediately
C. heated to 56ºC
D. stored at room temperature after centrifugation - ANSWER B. analyzed
immediately
Which of these 2-hour postprandial glucose values demonstrates unequivocal
hyperglycemia diagnostic for diabetes mellitus?
A. 160 mg/dL
B. 170 mg/dL
C. 180 mg/dL
D. 200 mg/dL - ANSWER D. 200 mg/dL
Serum levels that define hypoglycemia in preterm or low birth weight infants
are:
