CLINICAL CHEMISTRY MCQs
A. CARBOHYDRATES
_____1. Hypoglycemia comes about for various reasons and clinical symptoms usually
occur at blood glucose concentrations:
A. <3.8mmol/L B. < 3.0mmol/L C. <2.8mmol/L D. <5.0mmol/L
_____2. The healthy organism maintains the extracellular glucose concentration
remarkably constant within the limits of:
A. 5-12mmol/L C. 2.8- 3.8mmol/L
B. 3.3 – 10mmol/L D. 1.2- 2.4 mmol/L
_____3. Which classification of diabetes mellitus is genetically predetermined, HLA-
associated, chronic autoimmune disease with insulin deficiency and glucagons
excess as its pathophysiologic sequelae?
A. Type I C. non-obese type II
B. obese type II D. MODY-maturity onset diabetes of the young
_____4. According to the WHO criteria, patients with type I diabetes mellitus are, at the
time of diagnosis, characterized by:
1. hyperglycemia 2. ketonuria 3. ketoacidosis 4. normal weight
A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
_____5. In diabetic patient, this provides information about the average blood glucose
concentration during the preceding 6-8 weeks:
A. HbA1c C. HbB
B. HbF D. HbS
_____6. This term describes the disturbed insulin effect on cells such as adipocytes,
skeletal muscle cells, and hepatocytes. In simplified terms, glucose uptake by
these insulin-dependent cells is reduced. As compensdation, a rise in insulin
secretion with hyperinsulinemia ensues.
A. progressive hyperglycemia C. insulin resistance
B. impaired glucose tolerance D. glucose-mediated insulin secretion
_____7. Diabetes mellitus secondary to certain and other diseases and disorders may
involve the following organs:
1. pancreas 2. liver 3. anterior pituitary 4. adrenal gland
A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
_____8. In the case of gestational diabetes mellitus, a normal diurnal glucose profile
performed on the 3rd to 4th postpartum day rules out persistent diabetes mellitus.
In women with macrosomic children, the diurnal glucose profile does not
become valuable as an indicator until how many weeks after delivery?
A. 3 weeks B. 6 weeks C. 9 weeks D. 12 weeks
_____9. The determination of glucose tolerance following the oral administration of
glucose is recommended as a screening test for the presence of underlying
, gestational diabetes mellitus. How much gram of glucose is recommended in
this tolerance test?
A. 50 grams B. 75 grams C. 100 grams D. 120 grams
____10. Which of the following statements is true in screening tests for diabetes
mellitus?
A. The European Association for the Study of Diabetes recommends to
perform the Oral glucose tolerance test using 75g of glucose with 3 capillary
blood collections.
B. The European Association for the Study of Diabetes recommends to
perform the Oral glucose tolerance test using 100g of glucose with 4
capillary blood collections.
C. In the USA the oral glucose tolerance test is performed using 100g of
glucose with 3 venipuntures.
D. In the USA the oral glucose tolerance test is performed using 75g of glucose
with 4 venipuntures.
_____11. Which chromosome number is associated with non-HLA genes type 1 diabetes
mellitus?
A. 9 B. 11 C. 15 D. 17
_____12. Which of the following clinical laboratory tests are used for detecting the risk
of complications in newborns born to mothers with gestational diabetes or type
1 diabetes mellitus?
1. glucose 2. hematocrit 3. bilirubin 4. calcium
A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
_____13. Which of the following glucose concentrations denote plasma insulin
concentration as almost zero?
A. 20 mg/dL B. 40 mg/dL C. 60 mg/dL D. 80mg/dL
_____14. What enzyme catalyzes the oxidation of glucose into gluconic acid and H2O2?
A. glucose oxidase C. glucose hexokinase
B. glucose dehydrogenase D. mutarotase
_____15. What enzyme catalyzes the oxidation of glucose to glucolactone?
A. glucose oxidase C. glucose hexokinase
B. glucose dehydrogenase D. mutarotase
_____16. The diagnosis of diabetes mellitus is reliably established by which of the
following criteria?
1. unequivocally elevated postprandial or non-fasting glucose concentration
with or without classical symptoms of diabetes mellitus such as polydipsia,
polyuria, polyphagia, and weight loss
2. fasting and preprandial glucose values should be <90 mg/dl
3. increased fasting blood glucose values on at least two occasions.
4. glucosuria is usually present without ketonuria
, A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
____17. Which of the following statements regarding glucose blood samples is/are
correct?
1. After a period of fasting, the glucose concentration in venous blood is 5-
10% lower than arterial blood.
2. deproteinization will result to glucose decrease.
3. the glucose content of erythrocytes is lower than that in plasma
4. glucose values in venous plasma are 10% lower than those in venous whole
blood.
A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
_____18. In case of capillary blood sampling, 0.01-0.05 mL of blood are placed in a
solution to hemolyze red cells if the glucose determination will be performed
using automated analysis systems. Which of the following glycolysis
inhibitors are used with hemolyzation solution?
1. maleinimide 2. monoiodine acetate 3. sodium fluoride 4. cresol
A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
_____19. Which of the following statements are correct in relation to the stability of
glucose in blood samples?
1. In venous blood at 4C there is only a slight decrease during the first 2h and
approximately 20% after 24h.
2. In collection tubes containing EDTA there is no decrease within 24h in the
presence of maleinimide or sodium fluoride
3. by adding 2.5g/L sodium fluoride or 0.5g/L sodium monoiodine acetate the
decrease in plasma glucose is only 3-5% in 24h
4. Perchloric acid deproteinized sample gives stable values in the supernatant,
obtained by centrifugation for at least 5 days.
A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
_____20. Which method of determination for glucose is the reference method?
A. oxidase B. dehydrogenase C. hexokinase D. glucometers
_____21. Among the sugars usually occurring in the blood, which of the following are
detected by glucose dehydrogenase method?
1. glucose 2. sucrose 3. xylose 4. galactose
A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
_____22. In the hexokinase method, which of the following may be a source of
methodologic errors?
A. the addition of maleinimide in a hemolysate
B. deproteinization using perchloric acid
C. drug interference
D. maleinimide inhibits erythrocyte enzymes
_____23. Which of the following are diagnostic significance of glucose determinations
in body fluids?
A. CARBOHYDRATES
_____1. Hypoglycemia comes about for various reasons and clinical symptoms usually
occur at blood glucose concentrations:
A. <3.8mmol/L B. < 3.0mmol/L C. <2.8mmol/L D. <5.0mmol/L
_____2. The healthy organism maintains the extracellular glucose concentration
remarkably constant within the limits of:
A. 5-12mmol/L C. 2.8- 3.8mmol/L
B. 3.3 – 10mmol/L D. 1.2- 2.4 mmol/L
_____3. Which classification of diabetes mellitus is genetically predetermined, HLA-
associated, chronic autoimmune disease with insulin deficiency and glucagons
excess as its pathophysiologic sequelae?
A. Type I C. non-obese type II
B. obese type II D. MODY-maturity onset diabetes of the young
_____4. According to the WHO criteria, patients with type I diabetes mellitus are, at the
time of diagnosis, characterized by:
1. hyperglycemia 2. ketonuria 3. ketoacidosis 4. normal weight
A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
_____5. In diabetic patient, this provides information about the average blood glucose
concentration during the preceding 6-8 weeks:
A. HbA1c C. HbB
B. HbF D. HbS
_____6. This term describes the disturbed insulin effect on cells such as adipocytes,
skeletal muscle cells, and hepatocytes. In simplified terms, glucose uptake by
these insulin-dependent cells is reduced. As compensdation, a rise in insulin
secretion with hyperinsulinemia ensues.
A. progressive hyperglycemia C. insulin resistance
B. impaired glucose tolerance D. glucose-mediated insulin secretion
_____7. Diabetes mellitus secondary to certain and other diseases and disorders may
involve the following organs:
1. pancreas 2. liver 3. anterior pituitary 4. adrenal gland
A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
_____8. In the case of gestational diabetes mellitus, a normal diurnal glucose profile
performed on the 3rd to 4th postpartum day rules out persistent diabetes mellitus.
In women with macrosomic children, the diurnal glucose profile does not
become valuable as an indicator until how many weeks after delivery?
A. 3 weeks B. 6 weeks C. 9 weeks D. 12 weeks
_____9. The determination of glucose tolerance following the oral administration of
glucose is recommended as a screening test for the presence of underlying
, gestational diabetes mellitus. How much gram of glucose is recommended in
this tolerance test?
A. 50 grams B. 75 grams C. 100 grams D. 120 grams
____10. Which of the following statements is true in screening tests for diabetes
mellitus?
A. The European Association for the Study of Diabetes recommends to
perform the Oral glucose tolerance test using 75g of glucose with 3 capillary
blood collections.
B. The European Association for the Study of Diabetes recommends to
perform the Oral glucose tolerance test using 100g of glucose with 4
capillary blood collections.
C. In the USA the oral glucose tolerance test is performed using 100g of
glucose with 3 venipuntures.
D. In the USA the oral glucose tolerance test is performed using 75g of glucose
with 4 venipuntures.
_____11. Which chromosome number is associated with non-HLA genes type 1 diabetes
mellitus?
A. 9 B. 11 C. 15 D. 17
_____12. Which of the following clinical laboratory tests are used for detecting the risk
of complications in newborns born to mothers with gestational diabetes or type
1 diabetes mellitus?
1. glucose 2. hematocrit 3. bilirubin 4. calcium
A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
_____13. Which of the following glucose concentrations denote plasma insulin
concentration as almost zero?
A. 20 mg/dL B. 40 mg/dL C. 60 mg/dL D. 80mg/dL
_____14. What enzyme catalyzes the oxidation of glucose into gluconic acid and H2O2?
A. glucose oxidase C. glucose hexokinase
B. glucose dehydrogenase D. mutarotase
_____15. What enzyme catalyzes the oxidation of glucose to glucolactone?
A. glucose oxidase C. glucose hexokinase
B. glucose dehydrogenase D. mutarotase
_____16. The diagnosis of diabetes mellitus is reliably established by which of the
following criteria?
1. unequivocally elevated postprandial or non-fasting glucose concentration
with or without classical symptoms of diabetes mellitus such as polydipsia,
polyuria, polyphagia, and weight loss
2. fasting and preprandial glucose values should be <90 mg/dl
3. increased fasting blood glucose values on at least two occasions.
4. glucosuria is usually present without ketonuria
, A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
____17. Which of the following statements regarding glucose blood samples is/are
correct?
1. After a period of fasting, the glucose concentration in venous blood is 5-
10% lower than arterial blood.
2. deproteinization will result to glucose decrease.
3. the glucose content of erythrocytes is lower than that in plasma
4. glucose values in venous plasma are 10% lower than those in venous whole
blood.
A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
_____18. In case of capillary blood sampling, 0.01-0.05 mL of blood are placed in a
solution to hemolyze red cells if the glucose determination will be performed
using automated analysis systems. Which of the following glycolysis
inhibitors are used with hemolyzation solution?
1. maleinimide 2. monoiodine acetate 3. sodium fluoride 4. cresol
A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
_____19. Which of the following statements are correct in relation to the stability of
glucose in blood samples?
1. In venous blood at 4C there is only a slight decrease during the first 2h and
approximately 20% after 24h.
2. In collection tubes containing EDTA there is no decrease within 24h in the
presence of maleinimide or sodium fluoride
3. by adding 2.5g/L sodium fluoride or 0.5g/L sodium monoiodine acetate the
decrease in plasma glucose is only 3-5% in 24h
4. Perchloric acid deproteinized sample gives stable values in the supernatant,
obtained by centrifugation for at least 5 days.
A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
_____20. Which method of determination for glucose is the reference method?
A. oxidase B. dehydrogenase C. hexokinase D. glucometers
_____21. Among the sugars usually occurring in the blood, which of the following are
detected by glucose dehydrogenase method?
1. glucose 2. sucrose 3. xylose 4. galactose
A. only 1 and 3 are correct C. only 1,2, and 3 are correct
B. only 2 and 4 are correct D. 1,2,3 and 4 are correct
_____22. In the hexokinase method, which of the following may be a source of
methodologic errors?
A. the addition of maleinimide in a hemolysate
B. deproteinization using perchloric acid
C. drug interference
D. maleinimide inhibits erythrocyte enzymes
_____23. Which of the following are diagnostic significance of glucose determinations
in body fluids?
