LOUISIANA MEDICAL LABORATORY SCIENTIST
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) Q&A 2027 |INSTANT
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1. Which anticoagulant is routinely used for a complete blood
count (CBC)?
A. Sodium citrate
B. EDTA
C. Heparin
D. Sodium fluoride
Answer: B. EDTA
Rationale: EDTA preserves cellular morphology and prevents
clotting by chelating calcium, making it suitable for hematology
testing.
2. What is the primary function of red blood cells?
A. Produce antibodies
B. Transport oxygen
C. Initiate clotting
D. Destroy bacteria
Answer: B. Transport oxygen
Rationale: Hemoglobin within erythrocytes binds and
transports oxygen from the lungs to tissues.
,3. Which white blood cell is normally the most abundant in
peripheral blood?
A. Basophil
B. Eosinophil
C. Neutrophil
D. Monocyte
Answer: C. Neutrophil
Rationale: Neutrophils are the predominant circulating
leukocytes and are important in acute bacterial infections.
4. Which blood component is primarily responsible for
hemostasis?
A. Platelets
B. Erythrocytes
C. Lymphocytes
D. Albumin
Answer: A. Platelets
Rationale: Platelets adhere to damaged vessels and form the
initial platelet plug during hemostasis.
5. Which test is commonly used to evaluate the extrinsic
coagulation pathway?
A. aPTT
B. PT
C. Thrombin time
D. Bleeding time
,Answer: B. PT
Rationale: Prothrombin time evaluates the extrinsic and
common coagulation pathways and is commonly used to
monitor warfarin therapy.
6. Which test is primarily used to monitor unfractionated
heparin therapy?
A. PT
B. aPTT
C. INR only
D. D-dimer
Answer: B. aPTT
Rationale: Activated partial thromboplastin time is commonly
used to monitor unfractionated heparin.
7. Which blood group is considered the universal red-cell
donor when ABO and Rh compatibility are considered?
A. AB positive
B. A positive
C. O negative
D. B negative
Answer: C. O negative
Rationale: O-negative red cells lack A, B, and Rh(D) antigens
and are commonly used when emergency compatibility is
required.
8. Which immunoglobulin is most abundant in normal serum?
A. IgA
, B. IgE
C. IgG
D. IgM
Answer: C. IgG
Rationale: IgG is the predominant immunoglobulin in serum
and provides important systemic immune protection.
9. Which immunoglobulin is usually the first antibody
produced during a primary immune response?
A. IgA
B. IgG
C. IgM
D. IgE
Answer: C. IgM
Rationale: IgM is generally produced first during a primary
immune response.
10. Which organelle is primarily responsible for ATP
production in eukaryotic cells?
A. Ribosome
B. Lysosome
C. Mitochondrion
D. Golgi apparatus
Answer: C. Mitochondrion
Rationale: Mitochondria generate most cellular ATP through
oxidative phosphorylation.
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) Q&A 2027 |INSTANT
DOWNLOAD PDF
1. Which anticoagulant is routinely used for a complete blood
count (CBC)?
A. Sodium citrate
B. EDTA
C. Heparin
D. Sodium fluoride
Answer: B. EDTA
Rationale: EDTA preserves cellular morphology and prevents
clotting by chelating calcium, making it suitable for hematology
testing.
2. What is the primary function of red blood cells?
A. Produce antibodies
B. Transport oxygen
C. Initiate clotting
D. Destroy bacteria
Answer: B. Transport oxygen
Rationale: Hemoglobin within erythrocytes binds and
transports oxygen from the lungs to tissues.
,3. Which white blood cell is normally the most abundant in
peripheral blood?
A. Basophil
B. Eosinophil
C. Neutrophil
D. Monocyte
Answer: C. Neutrophil
Rationale: Neutrophils are the predominant circulating
leukocytes and are important in acute bacterial infections.
4. Which blood component is primarily responsible for
hemostasis?
A. Platelets
B. Erythrocytes
C. Lymphocytes
D. Albumin
Answer: A. Platelets
Rationale: Platelets adhere to damaged vessels and form the
initial platelet plug during hemostasis.
5. Which test is commonly used to evaluate the extrinsic
coagulation pathway?
A. aPTT
B. PT
C. Thrombin time
D. Bleeding time
,Answer: B. PT
Rationale: Prothrombin time evaluates the extrinsic and
common coagulation pathways and is commonly used to
monitor warfarin therapy.
6. Which test is primarily used to monitor unfractionated
heparin therapy?
A. PT
B. aPTT
C. INR only
D. D-dimer
Answer: B. aPTT
Rationale: Activated partial thromboplastin time is commonly
used to monitor unfractionated heparin.
7. Which blood group is considered the universal red-cell
donor when ABO and Rh compatibility are considered?
A. AB positive
B. A positive
C. O negative
D. B negative
Answer: C. O negative
Rationale: O-negative red cells lack A, B, and Rh(D) antigens
and are commonly used when emergency compatibility is
required.
8. Which immunoglobulin is most abundant in normal serum?
A. IgA
, B. IgE
C. IgG
D. IgM
Answer: C. IgG
Rationale: IgG is the predominant immunoglobulin in serum
and provides important systemic immune protection.
9. Which immunoglobulin is usually the first antibody
produced during a primary immune response?
A. IgA
B. IgG
C. IgM
D. IgE
Answer: C. IgM
Rationale: IgM is generally produced first during a primary
immune response.
10. Which organelle is primarily responsible for ATP
production in eukaryotic cells?
A. Ribosome
B. Lysosome
C. Mitochondrion
D. Golgi apparatus
Answer: C. Mitochondrion
Rationale: Mitochondria generate most cellular ATP through
oxidative phosphorylation.
