Clinical Chemistry Examination
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Clinical chemistry primarily involves the analysis of:
A. Microorganisms only
B. Chemical constituents of body fluids
C. Human anatomy only
D. Histological tissue sections
Correct Answer: B. Chemical constituents of body fluids
Rationale: Clinical chemistry measures chemical substances in blood, urine,
cerebrospinal fluid, and other body fluids to aid diagnosis, monitoring, and
treatment.
2. Which specimen is most commonly used in clinical chemistry testing?
A. Serum
B. Hair
C. Skin biopsy
D. Bone marrow
Correct Answer: A. Serum
Rationale: Serum is the most frequently analyzed specimen because it contains
many measurable analytes and lacks clotting factors.
,3. Serum is obtained by:
A. Allowing blood to clot before centrifugation
B. Adding anticoagulant before centrifugation
C. Freezing whole blood immediately
D. Mixing blood with formalin
Correct Answer: A. Allowing blood to clot before centrifugation
Rationale: Blood is allowed to clot, and centrifugation separates the serum from
the clot.
4. Plasma differs from serum because plasma contains:
A. Fibrinogen
B. Hemoglobin only
C. Bilirubin only
D. Glucose only
Correct Answer: A. Fibrinogen
Rationale: Plasma retains clotting factors, including fibrinogen, because
anticoagulants prevent clot formation.
5. Which anticoagulant is commonly used for plasma chemistry testing?
A. Lithium heparin
B. Formalin
C. Iodine
D. Ethanol
Correct Answer: A. Lithium heparin
Rationale: Lithium heparin is widely used because it minimally interferes with
many chemistry assays.
,6. Centrifugation is performed to:
A. Separate cellular components from liquid components
B. Sterilize specimens
C. Measure pH
D. Detect microorganisms
Correct Answer: A. Separate cellular components from liquid components
Rationale: Centrifugation separates serum or plasma from blood cells.
7. Hemolysis refers to:
A. Rupture of red blood cells
B. Clot formation
C. Bacterial contamination
D. Platelet aggregation only
Correct Answer: A. Rupture of red blood cells
Rationale: Hemolysis releases intracellular substances that may interfere with
laboratory results.
8. Hemolyzed specimens may falsely increase the measured concentration of:
A. Potassium
B. Sodium
C. Chloride
D. Calcium only
Correct Answer: A. Potassium
Rationale: Red blood cells contain high concentrations of potassium, which is
released during hemolysis.
9. Lipemia is caused by:
, A. Excess lipids in the specimen
B. Low glucose concentration
C. Increased bilirubin only
D. Excess calcium
Correct Answer: A. Excess lipids in the specimen
Rationale: Lipemic samples appear cloudy due to elevated triglycerides and may
interfere with photometric assays.
10. Icteric serum appears:
A. Yellow due to elevated bilirubin
B. Bright red from hemolysis
C. White from lipids
D. Blue from medications
Correct Answer: A. Yellow due to elevated bilirubin
Rationale: Bilirubin imparts a yellow coloration to serum or plasma.
11. Quality control samples are analyzed to:
A. Monitor analytical accuracy and precision
B. Replace patient testing
C. Sterilize instruments
D. Prepare reagents only
Correct Answer: A. Monitor analytical accuracy and precision
Rationale: Quality control verifies that an analytical system is functioning properly
before patient results are reported.
12. Accuracy refers to:
A. Closeness of results to the true value
B. Reproducibility of repeated results only
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Clinical chemistry primarily involves the analysis of:
A. Microorganisms only
B. Chemical constituents of body fluids
C. Human anatomy only
D. Histological tissue sections
Correct Answer: B. Chemical constituents of body fluids
Rationale: Clinical chemistry measures chemical substances in blood, urine,
cerebrospinal fluid, and other body fluids to aid diagnosis, monitoring, and
treatment.
2. Which specimen is most commonly used in clinical chemistry testing?
A. Serum
B. Hair
C. Skin biopsy
D. Bone marrow
Correct Answer: A. Serum
Rationale: Serum is the most frequently analyzed specimen because it contains
many measurable analytes and lacks clotting factors.
,3. Serum is obtained by:
A. Allowing blood to clot before centrifugation
B. Adding anticoagulant before centrifugation
C. Freezing whole blood immediately
D. Mixing blood with formalin
Correct Answer: A. Allowing blood to clot before centrifugation
Rationale: Blood is allowed to clot, and centrifugation separates the serum from
the clot.
4. Plasma differs from serum because plasma contains:
A. Fibrinogen
B. Hemoglobin only
C. Bilirubin only
D. Glucose only
Correct Answer: A. Fibrinogen
Rationale: Plasma retains clotting factors, including fibrinogen, because
anticoagulants prevent clot formation.
5. Which anticoagulant is commonly used for plasma chemistry testing?
A. Lithium heparin
B. Formalin
C. Iodine
D. Ethanol
Correct Answer: A. Lithium heparin
Rationale: Lithium heparin is widely used because it minimally interferes with
many chemistry assays.
,6. Centrifugation is performed to:
A. Separate cellular components from liquid components
B. Sterilize specimens
C. Measure pH
D. Detect microorganisms
Correct Answer: A. Separate cellular components from liquid components
Rationale: Centrifugation separates serum or plasma from blood cells.
7. Hemolysis refers to:
A. Rupture of red blood cells
B. Clot formation
C. Bacterial contamination
D. Platelet aggregation only
Correct Answer: A. Rupture of red blood cells
Rationale: Hemolysis releases intracellular substances that may interfere with
laboratory results.
8. Hemolyzed specimens may falsely increase the measured concentration of:
A. Potassium
B. Sodium
C. Chloride
D. Calcium only
Correct Answer: A. Potassium
Rationale: Red blood cells contain high concentrations of potassium, which is
released during hemolysis.
9. Lipemia is caused by:
, A. Excess lipids in the specimen
B. Low glucose concentration
C. Increased bilirubin only
D. Excess calcium
Correct Answer: A. Excess lipids in the specimen
Rationale: Lipemic samples appear cloudy due to elevated triglycerides and may
interfere with photometric assays.
10. Icteric serum appears:
A. Yellow due to elevated bilirubin
B. Bright red from hemolysis
C. White from lipids
D. Blue from medications
Correct Answer: A. Yellow due to elevated bilirubin
Rationale: Bilirubin imparts a yellow coloration to serum or plasma.
11. Quality control samples are analyzed to:
A. Monitor analytical accuracy and precision
B. Replace patient testing
C. Sterilize instruments
D. Prepare reagents only
Correct Answer: A. Monitor analytical accuracy and precision
Rationale: Quality control verifies that an analytical system is functioning properly
before patient results are reported.
12. Accuracy refers to:
A. Closeness of results to the true value
B. Reproducibility of repeated results only
