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

❓ What is the primary function of the platelet?

A) Oxygen transport
B) Immune response
C) Hemostasis
D) Erythropoiesis

💡 Correct Answer: C
📖 Clinical Explanation: Platelets are essential for primary hemostasis through adhesion, activation, and aggregation.

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

❓ Which of the following is associated with the presence of target cells?

A) Liver disease
B) Iron deficiency
C) Aplastic anemia
D) Viral infection

💡 Correct Answer: A
📖 Clinical Explanation: Target cells (codocytes) are frequently seen in liver disease due to increased membrane surface area.

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

❓ What is the significance of a positive nitroblue tetrazolium (NBT) test?

A) Chronic granulomatous disease
B) G6PD deficiency
C) Leukemia
D) Sickle cell disease

💡 Correct Answer: A
📖 Clinical Explanation: The NBT test is used to diagnose Chronic Granulomatous Disease; a negative (or reduced) result indicates defective NADPH oxidase function.

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

❓ Which coagulation factor is Vitamin K dependent?

A) Factor II
B) Factor V
C) Factor VIII
D) Factor XI

💡 Correct Answer: A
📖 Clinical Explanation: Factors II, VII, IX, and X are Vitamin K dependent.

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

❓ What is the normal pH of urine?

A) 4.5-8.0
B) 2.0-3.0
C) 9.0-10.0
D) 1.0-2.0

💡 Correct Answer: A
📖 Clinical Explanation: Normal urine pH typically ranges from 4.5 to 8.0, depending on the diet and metabolic state.

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

❓ Which of the following is a marker for hematopoietic stem cells?

A) CD34
B) CD3
C) CD19
D) CD14

💡 Correct Answer: A
📖 Clinical Explanation: CD34 is the standard surface marker used to identify and quantify hematopoietic stem cells.

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

❓ Which condition shows the presence of 'smudge cells'?

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

💡 Correct Answer: B
📖 Clinical Explanation: Smudge cells are fragile lymphocytes that rupture during the preparation of a peripheral blood smear, common in Chronic Lymphocytic Leukemia (CLL).

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

❓ Which of the following is a cause of elevated ESR?

A) Sickle cell anemia
B) Polycythemia
C) Inflammation
D) Spherocytosis

💡 Correct Answer: C
📖 Clinical Explanation: Inflammation increases plasma proteins like fibrinogen, which promote RBC stacking and increase the ESR.

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

❓ What is the primary site of coagulation factor synthesis?

A) Liver
B) Kidney
C) Spleen
D) Bone marrow

💡 Correct Answer: A
📖 Clinical Explanation: The liver is the primary site for the synthesis of most coagulation factors.

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

❓ Which of the following is a type of white blood cell?

A) Erythrocyte
B) Platelet
C) Monocyte
D) Reticulocyte

💡 Correct Answer: C
📖 Clinical Explanation: Monocytes are a type of leukocyte (white blood cell) involved in the immune response.

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

❓ What is the function of the renal threshold for glucose?

A) Prevents glucose from entering the urine
B) Allows glucose to be reabsorbed
C) Regulates blood glucose levels
D) Determines the concentration of urine

💡 Correct Answer: A
📖 Clinical Explanation: The renal threshold for glucose (approx. 180 mg/dL) is the concentration above which the kidneys can no longer reabsorb all the filtered glucose, causing it to appear in the urine.

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

❓ Which of the following is a cause of leukopenia?

A) Chemotherapy
B) Bacterial infection
C) Exercise
D) Stress

💡 Correct Answer: A
📖 Clinical Explanation: Chemotherapy targets rapidly dividing cells in the bone marrow, often resulting in leukopenia.

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