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

❓ What is the normal M:E ratio in the adult bone marrow?

A) 1:1
B) 3:1
C) 10:1
D) 1:3

💡 Correct Answer: B
📖 Clinical Explanation: The normal myeloid-to-erythroid (M:E) ratio in adult bone marrow is approximately 3:1.

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

❓ Which of the following is a characteristic finding in Paroxysmal Nocturnal Hemoglobinuria (PNH)?

A) Deficiency of CD55 and CD59
B) Positive Coombs test
C) Increased osmotic fragility
D) Presence of Heinz bodies

💡 Correct Answer: A
📖 Clinical Explanation: PNH is caused by a somatic mutation in the PIGA gene, leading to the absence of GPI-anchored proteins like CD55 and CD59, making cells susceptible to complement-mediated lysis.

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

❓ What is the most sensitive test for monitoring heparin therapy?

A) PT
B) APTT
C) Fibrinogen level
D) Platelet count

💡 Correct Answer: B
📖 Clinical Explanation: The Activated Partial Thromboplastin Time (APTT) is the standard test for monitoring unfractionated heparin therapy.

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

❓ Which urine sediment finding is indicative of nephrotic syndrome?

A) Waxy casts
B) Fatty casts
C) Red cell casts
D) Hyaline casts

💡 Correct Answer: B
📖 Clinical Explanation: Fatty casts and oval fat bodies are classic findings in nephrotic syndrome due to significant proteinuria and lipiduria.

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

❓ Which enzyme is deficient in G6PD deficiency?

A) Pyruvate kinase
B) Glucose-6-phosphate dehydrogenase
C) Hexokinase
D) Lactate dehydrogenase

💡 Correct Answer: B
📖 Clinical Explanation: Glucose-6-phosphate dehydrogenase deficiency impairs the pentose phosphate pathway, leading to oxidative damage of hemoglobin and Heinz body formation.

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

❓ What is the primary protein found in Bence-Jones proteins?

A) Albumin
B) IgG heavy chains
C) Monoclonal immunoglobulin light chains
D) Beta-2 microglobulin

💡 Correct Answer: C
📖 Clinical Explanation: Bence-Jones proteins are monoclonal free immunoglobulin light chains (kappa or lambda) found in the urine of patients with multiple myeloma.

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

❓ Which stain is used to identify iron in bone marrow?

A) Wright-Giemsa
B) Prussian blue
C) Sudan black B
D) Periodic acid-Schiff (PAS)

💡 Correct Answer: B
📖 Clinical Explanation: Prussian blue stain reacts with ferric iron to produce a characteristic blue color, used to assess iron stores in bone marrow.

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

❓ Which cell is the precursor to the platelet?

A) Myeloblast
B) Pronormoblast
C) Megakaryoblast
D) Promyelocyte

💡 Correct Answer: C
📖 Clinical Explanation: The megakaryoblast differentiates into the megakaryocyte, which sheds platelets into the peripheral circulation.

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

❓ What is the primary indicator of folate deficiency?

A) Hypersegmented neutrophils
B) Target cells
C) Schistocytes
D) Dacrocytes

💡 Correct Answer: A
📖 Clinical Explanation: Folate and vitamin B12 deficiencies lead to megaloblastic maturation, characterized by hypersegmented neutrophils and macrocytic RBCs.

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

❓ Which coagulation factor is NOT produced by the liver?

A) Factor I
B) Factor II
C) Factor VIII
D) Factor VII

💡 Correct Answer: C
📖 Clinical Explanation: Factor VIII (antihemophilic factor) is produced primarily by endothelial cells, not the liver.

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

❓ Which type of anemia is associated with Cabot rings?

A) Iron deficiency
B) Megaloblastic anemia
C) Aplastic anemia
D) Hemolytic anemia

💡 Correct Answer: B
📖 Clinical Explanation: Cabot rings are remnants of the mitotic spindle and are seen in severe anemia, particularly megaloblastic anemia or lead poisoning.

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

❓ Which urine reagent strip test is most sensitive to albumin?

A) Protein
B) pH
C) Glucose
D) Ketones

💡 Correct Answer: A
📖 Clinical Explanation: The protein pad on a urine dipstick primarily reacts to the presence of albumin using the principle of the protein error of indicators.

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

❓ What is the normal range for a platelet count in adults?

A) 50,000–100,000/µL
B) 150,000–450,000/µL
C) 500,000–750,000/µL
D) 1.0–4.0 x 10^6/µL

💡 Correct Answer: B
📖 Clinical Explanation: The standard reference range for platelet count in healthy adults is 150,000 to 450,000 per microliter of blood.

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

❓ Which of these is a hallmark of acute promyelocytic leukemia (APL)?

A) t(8;21)
B) t(15;17)
C) t(9;22)
D) t(12;21)

💡 Correct Answer: B
📖 Clinical Explanation: APL (FAB M3) is associated with the t(15;17) translocation, which creates the PML-RARA fusion protein.

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

❓ Which parasite is found in the urine and is associated with hematuria?

A) Schistosoma haematobium
B) Trichomonas vaginalis
C) Enterobius vermicularis
D) Giardia lamblia

💡 Correct Answer: A
📖 Clinical Explanation: Schistosoma haematobium eggs are commonly found in the urine of infected patients and are associated with chronic hematuria.

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

❓ Which of the following describes the appearance of schistocytes?

A) Fragmented RBCs
B) Target-shaped RBCs
C) Spheroidal RBCs
D) Oval RBCs

💡 Correct Answer: A
📖 Clinical Explanation: Schistocytes are fragmented RBCs, often seen in microangiopathic hemolytic anemia.

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

❓ What is the purpose of the APTT reagent?

A) Activates the intrinsic pathway
B) Activates the extrinsic pathway
C) Activates the common pathway
D) Activates platelets

💡 Correct Answer: A
📖 Clinical Explanation: The APTT reagent contains a contact activator (like kaolin or silica) and phospholipids to trigger the intrinsic coagulation pathway.

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

❓ Which of these is a characteristic of a lymphocyte?

A) Large granules
B) High N:C ratio
C) Multilobed nucleus
D) Auer rods

💡 Correct Answer: B
📖 Clinical Explanation: Lymphocytes typically have a high nucleus-to-cytoplasm (N:C) ratio, reflecting their condensed chromatin and limited cytoplasm.

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

❓ What is the most common cause of hyperkalemia in a urine sample?

A) Renal failure
B) Hemolysis of cells in the sample
C) Dietary excess
D) Medication

💡 Correct Answer: B
📖 Clinical Explanation: While urine potassium is usually low, hemolysis of blood cells within the urine sample can falsely elevate the potassium result.

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

❓ Which of the following is a feature of iron deficiency anemia?

A) Increased ferritin
B) Decreased TIBC
C) Decreased ferritin
D) Increased serum iron

💡 Correct Answer: C
📖 Clinical Explanation: In iron deficiency, stored iron is depleted, leading to decreased serum ferritin.

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