🩺 Q21: A 32-year-old patient with suspected Paroxysmal Nocturnal Hemoglobinuria (PNH) undergoes flow cytometry. Which of the following protein markers, typically anchored to the cell membrane by glycosylphosphatidylinositol (GPI), would be absent on the surface of the patient's erythrocytes?

🩺 Q22: A urine specimen is processed and centrifuged. Upon microscopic examination, the technologist observes small, colorless, envelope-shaped crystals that are soluble in dilute hydrochloric acid. What is the most likely composition of these crystals?

🩺 Q23: A peripheral blood smear from a patient with severe megaloblastic anemia reveals hypersegmented neutrophils and macro-ovalocytes. Which of the following is the hallmark biochemical mechanism underlying this erythroid maturation abnormality?

🩺 Q24: During a routine urinalysis, the dipstick is positive for blood, but microscopic examination reveals no RBCs. The patient has a history of crush injury. What is the most likely substance reacting with the dipstick?

🩺 Q25: A patient's CBC shows marked leukocytosis with a left shift. A manual differential identifies cells with deeply basophilic cytoplasm and coarse, dark-staining granules that obscure the nucleus. These granules are water-soluble and may wash out during staining. What are these cells?

🩺 Q26: A urine specimen stored at room temperature for several hours shows a high pH and the presence of 'coffin-lid' crystals. Which crystal is being described?

🩺 Q27: In the context of hemoglobinopathies, which hemoglobin variant migrates to the same position as Hemoglobin S on cellulose acetate at pH 8.4?

🩺 Q28: Which of the following conditions is most commonly associated with the presence of oval fat bodies in the urine sediment?

🩺 Q29: A patient presents with a 'leukoerythroblastic' blood picture. Which of the following findings is characteristic of this term?

🩺 Q30: Which of the following urine sediment constituents is considered the most clinically significant indicator of renal tubular injury?

🩺 Q31: A urinalysis is performed on a patient with chronic renal failure. The sediment contains broad, waxy casts. What is the clinical significance of this finding?

🩺 Q32: Which of the following manual cell counts is most appropriate for a cerebrospinal fluid (CSF) sample that appears slightly turbid but has no visible clots?

🩺 Q33: A patient exhibits a 'target cell' (codocyte) morphology on their peripheral smear. Which of the following is NOT a classic cause of target cells?

🩺 Q34: A urine specimen is kept at room temperature for 4 hours. The dipstick is positive for nitrite, but microscopic examination shows no bacteria. What is the most likely reason for this discrepancy?

🩺 Q35: What is the primary diagnostic finding in a blood smear of a patient with Pelger-Huet anomaly?

🩺 Q36: A patient with suspected fat embolism syndrome has a urine specimen submitted for 'sudden onset of microhematuria'. What is the best stain to confirm the presence of lipiduria?

🩺 Q37: In the context of the automated hematology analyzer, which parameter is calculated rather than directly measured?

🩺 Q38: A 55-year-old patient with chronic myeloid leukemia presents with a sudden decrease in platelet count. A peripheral blood smear shows increased megakaryocytic fragments and naked megakaryocyte nuclei. Which of the following conditions is most likely associated with these findings?

🩺 Q39: A urine specimen from a patient with severe back pain reveals a reddish-brown color, positive dipstick for blood, but no RBCs on microscopic examination. The patient was recently treated with intravenous contrast for a CT scan. Which of the following is the most likely cause for this discrep

🩺 Q40: A peripheral blood smear demonstrates neutrophils with 'hypersegmentation' (6 or more lobes). Which laboratory value is most likely to be abnormal in this patient?