This set of 45 multiple-choice questions (MCQs) is designed to help medical professionals and students prepare for the DHA (Dubai Health Authority) exam, specifically focusing on clinical chemistry. The questions cover essential topics such as glucose metabolism, diagnostic criteria for diabetes, test interference, and common analytical methods. This resource is ideal for individuals looking to strengthen their knowledge in clinical laboratory practices and ensure readiness for certification exams in the healthcare field.
- Which of the following is true about portable glucose meters?
- A. Not recommended for all insulin-treated patients.
- B. Should be performed at least 2 times a day for type 1 diabetes.
- C. Should be performed at least 3 times a day for type 2 diabetes.
- D. Should not be used for diagnosis of diabetes and have limited value in screening. ✅
- The need to reevaluate treatment regimen for diabetes is necessary when the glycated hemoglobin is greater than:
- A. 2%
- B. 4%
- C. 6%
- D. 8% ✅
- Which of the following statements about type 1 diabetes mellitus are correct?
- 1. Formerly known as insulin dependent
- 2. Adult onset
- 3. Caused by autoimmune destruction of the B-cells of the pancreas
- 4. The pancreas synthesizes insulin but unable to secrete.
- A. only 1 and 3 are correct
- B. only 2 and 4 are correct
- C. only 1, 2, and 3 are correct
- D. 1, 2, 3 and 4 are correct
- Which of the following is the correct diagnostic criterion for establishing diabetes?
- A. Fasting blood glucose greater than 7.0mmol/L ✅
- B. Fasting blood glucose greater than 4.0mmol/L
- C. Fasting blood glucose greater than 2.0mmol/L
- D. Fasting blood glucose greater than 20.0mmol/L
- Which of the following is the correct diagnostic criterion for establishing diabetes?
- A. 2hpp greater than 7.0mmol/L
- B. 2hpp greater than 9.11mmol/L
- C. 2hpp greater than 11.1mmol/L ✅
- D. 2hpp greater than 20.0mmol/L
- For overweight individuals, starting at age 10 years, diabetes testing should be performed every:
- A. Month
- B. six months
- C. year ✅
- D. 2 years
- For inhibition of glycolysis, how much mg of fluoride must be used per mL of blood?
- A. 1.0
- B. 2.5
- C. 3.0
- D. 0.5 ✅
- For inhibition of glycolysis, how much lithium iodoacetate must be used per mL of blood?
- A. 1.0mg
- B. 2.5mg
- C. 3.0mg
- D. 0.5mg ✅
- Given a normal hematocrit, the glucose concentrations in plasma is higher than that of whole blood by approximately:
- A. 7%
- B. 11% ✅
- C. 4%
- D. 17%
- Glucose concentrations in heparinized plasma are reported to be lower than in serum by:
- A. 2%
- B. 5% ✅
- C. 10%
- D. 0.5%
- Which of the following enzymatic methods is least used for glucose measurement?
- A. Hexokinase
- B. Oxidase
- C. Dehydrogenase
- D. Isomerase ✅
- Multiple factors can interfere with glucose analysis with portable meters such as:
- 1. Improper application, timing and removal of excess blood
- 2. Changes in hematocrit, altitude, environmental temperature or humidity
- 3. Training and technique of user
- 4. Hypotension, hypoxia and high triglyceride concentration
- A. only 1 and 3 are correct
- B. only 2 and 4 are correct
- C. only 1, 2, and 3 are correct
- D. 1, 2, 3 and 4 are correct ✅
- SMBG should be performed at least how many times per day in patients with type 1 diabetes?
- A. 1
- B. 2
- C. 3
- D. 4 ✅
- High-risk pregnant patients should undergo immediate testing when they are defined as having which of the following?
- 1. marked obesity
- 2. personal history of GDM
- 3. Glycosuria
- 4. Strong family history of diabetes
- A. only 1 and 3 are correct
- B. only 2 and 4 are correct
- C. only 1, 2, and 3 are correct
- D. 1, 2, 3 and 4 are correct ✅
- This test is used as an index of mean glycemia and as measure of risk for the development of diabetes complications.
- A. Ketone
- B. GHb ✅
- C. IFG
- D. IGT
