🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ Which cell is the largest in the bone marrow?

A) Myeloblast
B) Megakaryocyte
C) Plasma cell
D) Osteoblast

💡 Correct Answer: B
📖 Clinical Explanation: The megakaryocyte is a massive, polyploid cell responsible for platelet production.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ What is the effect of aspirin on platelet function?

A) Inhibits COX-1
B) Inhibits thrombin
C) Inhibits factor X
D) Increases fibrinolysis

💡 Correct Answer: A
📖 Clinical Explanation: Aspirin irreversibly inhibits cyclooxygenase-1 (COX-1), preventing the formation of thromboxane A2, which is necessary for platelet aggregation.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ Which stain is used to confirm the diagnosis of Burkitt lymphoma?

A) Sudan black B
B) PAS
C) Acid phosphatase
D) Myeloperoxidase

💡 Correct Answer: B
📖 Clinical Explanation: Burkitt lymphoma cells are typically positive for PAS stain.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ Which of the following is a sign of iron overload?

A) High ferritin
B) Low ferritin
C) High TIBC
D) Low transferrin saturation

💡 Correct Answer: A
📖 Clinical Explanation: High serum ferritin is the most sensitive indicator of iron overload.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ What is the normal urine output in an adult?

A) 100-200 mL/day
B) 500-1000 mL/day
C) 1200-1500 mL/day
D) 3000-4000 mL/day

💡 Correct Answer: C
📖 Clinical Explanation: Normal daily urine output for a healthy adult is typically between 1200 and 1500 mL.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ Which of the following is a cause of macrocytic anemia?

A) Alcoholism
B) Iron deficiency
C) Lead poisoning
D) Sideroblastic anemia

💡 Correct Answer: A
📖 Clinical Explanation: Alcoholism is a common cause of macrocytic anemia, often due to direct toxic effects on the marrow or associated nutritional deficiencies.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ What is the primary function of the PFA-100?

A) Coagulation time
B) Platelet function analysis
C) Platelet count
D) Fibrinogen level

💡 Correct Answer: B
📖 Clinical Explanation: The PFA-100 is an automated instrument used to assess platelet function under high shear stress.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ Which of these is a non-neoplastic cause of neutrophilia?

A) CML
B) Acute infection
C) Polycythemia vera
D) Essential thrombocythemia

💡 Correct Answer: B
📖 Clinical Explanation: Acute infection causes reactive neutrophilia, which is a physiological response rather than a neoplastic one.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ Which condition is characterized by the presence of Auer rods?

A) ALL
B) AML
C) CLL
D) CML

💡 Correct Answer: B
📖 Clinical Explanation: Auer rods are rod-shaped cytoplasmic inclusions formed by the fusion of primary granules, seen in Acute Myeloid Leukemia (AML).

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ Which urine sediment suggests a lower urinary tract infection?

A) WBC casts
B) Bacteria and WBCs
C) RBC casts
D) Hyaline casts

💡 Correct Answer: B
📖 Clinical Explanation: The presence of bacteria and WBCs without casts is characteristic of a lower urinary tract infection (cystitis).

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ What is the most common hemoglobin variant in the US?

A) HbS
B) HbC
C) HbA
D) HbE

💡 Correct Answer: C
📖 Clinical Explanation: HbA (alpha2 beta2) is the normal adult hemoglobin and the most abundant.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ Which of the following is a cause of thrombocytopenia?

A) ITP
B) Iron deficiency
C) Polycythemia
D) Leukocytosis

💡 Correct Answer: A
📖 Clinical Explanation: Immune Thrombocytopenic Purpura (ITP) is a condition where antibodies destroy platelets, leading to low platelet counts.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ What is the definition of a shift to the right in the CBC?

A) Increased bands
B) Increased hypersegmented neutrophils
C) Increased myeloblasts
D) Increased reticulocytes

💡 Correct Answer: B
📖 Clinical Explanation: A shift to the right refers to the presence of hypersegmented neutrophils, commonly seen in megaloblastic anemia.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ Which test monitors the effect of warfarin?

A) PT/INR
B) APTT
C) Bleeding time
D) Platelet count

💡 Correct Answer: A
📖 Clinical Explanation: Warfarin (Coumadin) therapy is monitored using the Prothrombin Time (PT), reported as the International Normalized Ratio (INR).

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ Which of the following is a feature of a normal peripheral blood smear?

A) Presence of blasts
B) Presence of nucleated RBCs
C) Absence of immature cells
D) Presence of toxic granulation

💡 Correct Answer: C
📖 Clinical Explanation: In a healthy adult, the peripheral blood smear should not contain immature cells like blasts or nucleated RBCs.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ What is the main component of a waxy cast?

A) Degenerated cellular casts
B) Fatty acids
C) Hemoglobin
D) Albumin

💡 Correct Answer: A
📖 Clinical Explanation: Waxy casts represent the final stage of cast degeneration, indicating severe stasis in the renal tubules.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ Which cell is the precursor of the macrophage?

A) Monoblast
B) Myeloblast
C) Lymphoblast
D) Pronormoblast

💡 Correct Answer: A
📖 Clinical Explanation: The monoblast differentiates into the monocyte, which then migrates to tissues and becomes a macrophage.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ Which of these is a cause of increased reticulocytes?

A) Aplastic anemia
B) Hemolytic anemia
C) Iron deficiency
D) Renal failure

💡 Correct Answer: B
📖 Clinical Explanation: In hemolytic anemia, the bone marrow increases production of RBCs to compensate for the shortened life span, leading to reticulocytosis.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ What is the main component of a waxy cast?

A) Degenerated cellular casts
B) Fatty acids
C) Hemoglobin
D) Albumin

💡 Correct Answer: A
📖 Clinical Explanation: Waxy casts represent the final stage of cast degeneration, indicating severe stasis in the renal tubules.

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🔬 HIGH-YIELD MEDICAL LAB SCIENCE MCQ
📚 Specialty: Hematology & Clinical Microscopy

❓ Which cell is the precursor of the macrophage?

A) Monoblast
B) Myeloblast
C) Lymphoblast
D) Pronormoblast

💡 Correct Answer: A
📖 Clinical Explanation: The monoblast differentiates into the monocyte, which then migrates to tissues and becomes a macrophage.

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