Thalassemia MCQs With Answer for B.Pharm students provides a concise, exam-focused review of alpha and beta thalassemia genetics, pathophysiology, clinical features, laboratory diagnosis, and contemporary management. This Student-friendly post emphasizes key terms like thalassemia, beta-thalassemia, alpha-thalassemia, iron chelation therapy, blood transfusion, Hb electrophoresis, prenatal diagnosis, and gene therapy to help pharmacy students prepare for university exams and competitive tests. The questions explore molecular mechanisms, diagnostic markers (MCV, HbA2, HbF), complications of iron overload, chelators, transplant and emerging CRISPR/gene-addition approaches—offering applied clinical and pharmaceutical perspectives relevant to B.Pharm coursework. Now let’s test your knowledge with 50 MCQs on this topic.
Q1. What is the fundamental defect in thalassemia?
- Quantitative reduction in globin chain synthesis
- Qualitative defect in globin chain structure due to a point mutation
- Autoimmune hemolysis of red blood cells
- Iron deficiency leading to reduced hemoglobin production
Correct Answer: Quantitative reduction in globin chain synthesis
Q2. Which chromosomes carry the alpha- and beta-globin gene clusters respectively?
- Chromosome 16 for alpha; Chromosome 11 for beta
- Chromosome 11 for alpha; Chromosome 16 for beta
- Chromosome 21 for alpha; Chromosome 7 for beta
- Chromosome X for alpha; Chromosome Y for beta
Correct Answer: Chromosome 16 for alpha; Chromosome 11 for beta
Q3. Beta-thalassemia commonly arises from which type of genetic mutation?
- Point mutations affecting splicing, promoter or coding regions
- Large chromosomal deletions removing all beta-globin genes
- Triplet repeat expansions in intronic regions
- Mitochondrial DNA mutations
Correct Answer: Point mutations affecting splicing, promoter or coding regions
Q4. The clinical severity of alpha-thalassemia correlates best with which factor?
- Number of alpha-globin gene deletions (0–4)
- Presence of point mutations in the beta-globin gene
- Patient age at first transfusion
- Serum ferritin concentration alone
Correct Answer: Number of alpha-globin gene deletions (0–4)
Q5. Which hemoglobin pattern is typical of untreated beta-thalassemia major on electrophoresis?
- Absence of HbA, markedly elevated HbF, increased HbA2
- Normal HbA, decreased HbF, normal HbA2
- Predominant HbS with reduced HbF
- High HbA with low HbA2 and HbF
Correct Answer: Absence of HbA, markedly elevated HbF, increased HbA2
Q6. Which laboratory index helps distinguish beta-thalassemia trait from iron deficiency anemia?
- Mentzer index (MCV/RBC) usually <13 in thalassemia trait
- Serum vitamin B12 elevated in thalassemia trait
- Reticulocyte count is always normal in thalassemia trait
- Platelet count is decreased in thalassemia trait
Correct Answer: Mentzer index (MCV/RBC) usually <13 in thalassemia trait
Q7. Which peripheral smear feature is characteristic of thalassemia syndromes?
- Microcytic hypochromic RBCs with target cells and basophilic stippling
- Macro-ovalocytes and hypersegmented neutrophils
- Sickle-shaped RBCs predominating
- Schistocytes with helmet cells
Correct Answer: Microcytic hypochromic RBCs with target cells and basophilic stippling
Q8. Hb Bart’s (γ4) detected in a newborn is most indicative of which condition?
- Alpha-globin gene deletion (possibly hydrops fetalis with four-gene deletion)
- Beta-thalassemia minor
- Iron deficiency in the mother
- Hemoglobin S trait
Correct Answer: Alpha-globin gene deletion (possibly hydrops fetalis with four-gene deletion)
Q9. Which diagnostic method provides definitive molecular identification of thalassemia mutations?
- DNA analysis by PCR and sequencing
- Peripheral blood smear alone
- Serum ferritin measurement
- Urine porphyrin testing
Correct Answer: DNA analysis by PCR and sequencing
Q10. What is the primary therapeutic goal for regularly transfused transfusion-dependent beta-thalassemia patients?
- Maintain pre-transfusion hemoglobin to suppress ineffective erythropoiesis and avoid extramedullary hematopoiesis
- Minimize transfusions to below one unit per month irrespective of Hb
- Increase ferritin to reduce anemia
- Eliminate iron chelation to improve bone marrow activity
Correct Answer: Maintain pre-transfusion hemoglobin to suppress ineffective erythropoiesis and avoid extramedullary hematopoiesis
Q11. Which iron chelator is administered by subcutaneous infusion and has a risk of ototoxicity and growth retardation if overdosed?
- Deferoxamine (desferrioxamine)
- Deferasirox
- Deferiprone
- Desferiprone
Correct Answer: Deferoxamine (desferrioxamine)
Q12. Which oral iron chelator is associated with agranulocytosis as a serious adverse effect?
- Deferiprone
- Deferoxamine
- Deferasirox
- Defertrane
Correct Answer: Deferiprone
Q13. Which monitoring modality is most specific for assessing cardiac iron overload?
- Cardiac MRI T2* measurement
- Serum ferritin alone
- Chest X-ray
- ECG without imaging
Correct Answer: Cardiac MRI T2* measurement
Q14. Luspatercept, used in some thalassemia patients, primarily acts by which mechanism?
- Enhances late-stage erythroid maturation by trapping TGF-β superfamily ligands
- Directly increases iron excretion through the kidney
- Stimulates hematopoietic stem cell proliferation non-specifically
- Blocks erythropoietin receptors to reduce ineffective erythropoiesis
Correct Answer: Enhances late-stage erythroid maturation by trapping TGF-β superfamily ligands
Q15. The curative therapy for transfusion-dependent beta-thalassemia is:
- Allogeneic hematopoietic stem cell transplantation from a matched donor
- Lifetime iron chelation without transplantation
- Splenectomy alone
- Monthly folic acid injections
Correct Answer: Allogeneic hematopoietic stem cell transplantation from a matched donor
Q16. Gene-addition therapy for beta-thalassemia uses which vector type in current clinical practice?
- Lentiviral vectors to add a functional beta-globin gene
- Adeno-associated virus to deliver alpha-globin
- Non-viral plasmid injection into muscle
- Retroviral vectors injected intravenously without conditioning
Correct Answer: Lentiviral vectors to add a functional beta-globin gene
Q17. Which prenatal diagnostic procedures can detect thalassemia mutations during pregnancy?
- Chorionic villus sampling (CVS) and amniocentesis for molecular testing
- Maternal serum ferritin measurement
- Ultrasound bone density scan
- Maternal hemoglobin electrophoresis alone
Correct Answer: Chorionic villus sampling (CVS) and amniocentesis for molecular testing
Q18. A hallmark physiologic consequence of chronic ineffective erythropoiesis in thalassemia is:
- Marrow expansion with bone deformities and extramedullary hematopoiesis
- Excess platelet production causing thrombocytopenia
- Primary pulmonary hypertension without iron overload
- Hypersensitivity to vitamin D leading to hypercalcemia
Correct Answer: Marrow expansion with bone deformities and extramedullary hematopoiesis
Q19. Which laboratory finding is typical for beta-thalassemia trait?
- Elevated HbA2 (>3.5%) with microcytosis
- Markedly low serum ferritin with normal HbA2
- High MCV and macrocytosis
- Predominant HbS on electrophoresis
Correct Answer: Elevated HbA2 (>3.5%) with microcytosis
Q20. Which complication is the leading cause of mortality in chronically transfused thalassemia patients without adequate chelation?
- Cardiac siderosis leading to cardiomyopathy and heart failure
- Renal stones due to hypercalciuria
- Neurologic degeneration from iron in CSF
- Severe pulmonary embolism unrelated to splenectomy
Correct Answer: Cardiac siderosis leading to cardiomyopathy and heart failure
Q21. Which vaccine is especially recommended before splenectomy in thalassemia patients?
- Pneumococcal conjugate vaccine
- Varicella vaccine only
- Influenza vaccine only
- HPV vaccine only
Correct Answer: Pneumococcal conjugate vaccine
Q22. Which physical finding is commonly seen in untreated severe thalassemia major?
- Frontal bossing and maxillary overgrowth due to marrow expansion
- Peripheral neuropathy due to copper deficiency
- Generalized hyperpigmentation without other features
- Early-onset osteoarthritis due to iron deposition in joints
Correct Answer: Frontal bossing and maxillary overgrowth due to marrow expansion
Q23. What is the typical pre-transfusion hemoglobin target for regular transfusion programs in thalassemia major?
- Keep pre-transfusion Hb around 9–10 g/dL to suppress erythropoiesis
- Maintain Hb below 6 g/dL to avoid iron loading
- Keep Hb above 14 g/dL at all times
- Pre-transfusion Hb is not clinically relevant
Correct Answer: Keep pre-transfusion Hb around 9–10 g/dL to suppress erythropoiesis
Q24. Which statement about serum ferritin in thalassemia is correct?
- Serum ferritin is an indirect marker of body iron but may be elevated by inflammation
- Ferritin directly measures cardiac iron content accurately
- Ferritin is normally low in chronically transfused patients
- Ferritin measurement is unnecessary if MRI is available
Correct Answer: Serum ferritin is an indirect marker of body iron but may be elevated by inflammation
Q25. Splenectomy in thalassemia patients is indicated primarily for:
- Hypersplenism causing increased transfusion requirements and cytopenias
- Reducing iron overload by removing a major iron store
- Preventing thrombotic complications routinely
- Treating primary infection risk
Correct Answer: Hypersplenism causing increased transfusion requirements and cytopenias
Q26. Which statement about hemoglobin H (HbH) disease is true?
- It results from deletion of three alpha-globin genes and produces β4 tetramers
- It is due to homozygous beta-globin deletions producing γ4 tetramers
- It is clinically identical to beta-thalassemia trait
- HbH disease always requires immediate bone marrow transplant at birth
Correct Answer: It results from deletion of three alpha-globin genes and produces β4 tetramers
Q27. Which medication should generally be withheld during pregnancy in thalassemia patients due to teratogenic risk?
- Oral iron chelators such as deferasirox and deferiprone
- Folic acid supplementation
- Blood transfusion when required
- Penicillin prophylaxis after splenectomy
Correct Answer: Oral iron chelators such as deferasirox and deferiprone
Q28. Which laboratory technique accurately quantifies HbA2 and HbF fractions for diagnosis?
- High-performance liquid chromatography (HPLC)
- Complete metabolic panel
- Bone marrow biopsy only
- Peripheral smear Gram stain
Correct Answer: High-performance liquid chromatography (HPLC)
Q29. Why do target cells appear in thalassemia?
- Relative excess of cell membrane compared to hemoglobin content
- Autoimmune deposition of immune complexes on RBCs
- Extravascular hemolysis due to splenic trapping only
- Excess intracellular iron causing cell swelling
Correct Answer: Relative excess of cell membrane compared to hemoglobin content
Q30. What is the principal cause of iron overload in transfusion-dependent thalassemia?
- Repeated red cell transfusions introduce excess iron that accumulates in tissues
- Primary hemochromatosis due to HFE mutations in all patients
- Excessive dietary iron intake alone
- Increased gastrointestinal iron excretion
Correct Answer: Repeated red cell transfusions introduce excess iron that accumulates in tissues
Q31. Which endocrine complication is commonly associated with iron overload in thalassemia?
- Hypogonadism due to pituitary iron deposition
- Hyperthyroidism due to iron stimulation
- Type 1 diabetes exclusively from transfusions
- Cushing’s syndrome from chelation therapy
Correct Answer: Hypogonadism due to pituitary iron deposition
Q32. Overuse of deferasirox requires monitoring of which organ functions?
- Renal and hepatic function tests due to potential nephrotoxicity and hepatotoxicity
- Cardiac enzymes only
- Thyroid function exclusively
- Bone marrow biopsy monthly
Correct Answer: Renal and hepatic function tests due to potential nephrotoxicity and hepatotoxicity
Q33. Which transfusion-related complication is a concern in chronically transfused thalassemia patients?
- Alloimmunization to RBC antigens making cross-matching difficult
- Immediate development of autoimmune hemolytic anemia in all patients
- Guaranteed transmission of malaria from screened blood
- Permanent neutropenia unrelated to chelators
Correct Answer: Alloimmunization to RBC antigens making cross-matching difficult
Q34. What is the significance of elevated HbF in beta-thalassemia patients?
- Elevated HbF compensates for deficient beta chains and ameliorates severity in some patients
- HbF elevation is diagnostic of iron deficiency anemia
- High HbF causes renal failure directly
- Elevated HbF excludes any form of thalassemia
Correct Answer: Elevated HbF compensates for deficient beta chains and ameliorates severity in some patients
Q35. Which neonatal finding may complicate early hemoglobin analysis for thalassemia?
- High fetal hemoglobin (HbF) levels masking adult hemoglobin patterns
- High serum ferritin confusing diagnosis
- Delayed reticulocyte response until 6 months of age
- Inability to perform HPLC on cord blood
Correct Answer: High fetal hemoglobin (HbF) levels masking adult hemoglobin patterns
Q36. Which condition most closely mimics thalassemia trait on CBC with microcytosis?
- Iron deficiency anemia
- Pernicious anemia
- Acute leukemia
- Polycythemia vera
Correct Answer: Iron deficiency anemia
Q37. What is the role of population carrier screening for thalassemia?
- Identify carriers, enable genetic counseling and prenatal diagnosis to reduce severe disease incidence
- Replace all newborn screening programs
- Eliminate the need for iron studies in symptomatic patients
- Predict individual response to chelation drugs
Correct Answer: Identify carriers, enable genetic counseling and prenatal diagnosis to reduce severe disease incidence
Q38. Which imaging sign on skull X-ray is associated with marrow expansion in thalassemia?
- Crew-cut appearance due to widened diploic spaces
- Ground-glass opacity of the lungs
- Osteolytic lesions in long bones
- Calcified granulomas in the liver
Correct Answer: Crew-cut appearance due to widened diploic spaces
Q39. Which laboratory parameter is least likely to be elevated in untreated thalassemia major?
- Mean corpuscular volume (MCV)
- Reticulocyte count
- Serum bilirubin from hemolysis
- HbF percentage
Correct Answer: Mean corpuscular volume (MCV)
Q40. Which of the following best describes the protective effect of thalassemia traits against malaria?
- Carriers often have reduced severity of Plasmodium falciparum infection due to altered RBC environment
- Thalassemia trait increases malaria parasite replication uniformly
- There is no epidemiological association between thalassemia and malaria
- Thalassemia trait prevents mosquito bites entirely
Correct Answer: Carriers often have reduced severity of Plasmodium falciparum infection due to altered RBC environment
Q41. Which biochemical test helps estimate body iron stores but is influenced by inflammation?
- Serum ferritin
- Urinary iron excretion
- Serum transferrin receptor alone
- Serum vitamin C
Correct Answer: Serum ferritin
Q42. After splenectomy in a thalassemia patient, which hematologic change is expected?
- Rise in platelet count and persistent reticulocytosis
- Immediate normalization of HbF levels
- Marked decrease in ferritin due to splenic removal
- Permanent correction of anemia without transfusions
Correct Answer: Rise in platelet count and persistent reticulocytosis
Q43. Which of the following is an approved gene-editing approach target to treat beta-thalassemia by increasing HbF?
- Disruption of BCL11A erythroid enhancer using CRISPR to derepress fetal hemoglobin
- Inhibition of HFE gene to reduce iron absorption
- Activation of erythropoietin receptor with monoclonal antibodies
- Deletion of alpha-globin genes by ZFN in adult hepatocytes
Correct Answer: Disruption of BCL11A erythroid enhancer using CRISPR to derepress fetal hemoglobin
Q44. Which clinical feature suggests extramedullary hematopoiesis in thalassemia?
- Paraspinal masses and hepatosplenomegaly
- Isolated lymphadenopathy without hepatosplenomegaly
- Diffuse skin hyperpigmentation only
- Isolated hyponatremia
Correct Answer: Paraspinal masses and hepatosplenomegaly
Q45. Which of the following is a critical point in transfusion practice for thalassemia patients to reduce alloimmunization?
- Extended red cell antigen matching (Rh and Kell beyond ABO)
- Using whole blood instead of packed cells routinely
- Transfusing without crossmatch for speed
- Limiting transfusions to emergency settings only
Correct Answer: Extended red cell antigen matching (Rh and Kell beyond ABO)
Q46. Which laboratory index is typically normal in thalassemia trait but abnormal in iron deficiency?
- Red cell distribution width (RDW) often normal in thalassemia trait
- MCV is elevated in thalassemia trait
- Serum iron is always zero in thalassemia trait
- Reticulocyte count is suppressed only in thalassemia
Correct Answer: Red cell distribution width (RDW) often normal in thalassemia trait
Q47. Which chelation strategy is recommended when serum ferritin remains high despite therapy?
- Monitor adherence, consider combination chelation or change chelator based on side effects and MRI iron
- Stop chelation entirely and monitor only ferritin annually
- Switch to intravenous iron to balance totals
- Use only vitamin supplements to reduce ferritin
Correct Answer: Monitor adherence, consider combination chelation or change chelator based on side effects and MRI iron
Q48. Which infection screening is essential for units used in chronic transfusion programs?
- Screening for hepatitis B, hepatitis C, and HIV in donor blood
- Only screening for syphilis is required
- No screening required if donor is related
- Only malaria screening is necessary in all regions
Correct Answer: Screening for hepatitis B, hepatitis C, and HIV in donor blood
Q49. Which clinical scenario warrants urgent evaluation for cardiac iron overload in a thalassemia patient?
- New onset heart failure symptoms or arrhythmia in a chronically transfused patient
- Isolated mild joint pain without systemic signs
- Elevated RDW without symptoms
- Low-grade fever after transfusion only once
Correct Answer: New onset heart failure symptoms or arrhythmia in a chronically transfused patient
Q50. Which public health measure most effectively reduces the incidence of severe thalassemia in high-prevalence areas?
- Comprehensive carrier screening, premarital counseling, and prenatal diagnosis programs
- Universal infant iron supplementation irrespective of diagnosis
- Mass vaccination against thalassemia
- Elimination of blood transfusion services
Correct Answer: Comprehensive carrier screening, premarital counseling, and prenatal diagnosis programs
