🩺 Q376: A urine specimen appears dark brown or black and turns even darker upon standing. Which metabolite is likely responsible?

🩺 Q376: A patient with a prosthetic heart valve develops endocarditis. Blood cultures yield a Gram-positive coccus that is catalase-negative and PYR-positive. What is the most likely species?

🩺 Q377: The presence of significant levels of nitrites in a urine specimen is most indicative of:

🩺 Q379: Which fixative is the standard for routine histology because it cross-links proteins without destroying antigenicity for most immunohistochemical stains?

🩺 Q380: A patient with chronic obstructive pulmonary disease (COPD) has the following blood gas results: pH 7.32, pCO2 55 mmHg, HCO3 28 mmol/L. How is the acid-base status best classified?

🩺 Q381: Which tumor marker is most clinically useful for monitoring the recurrence of ovarian cancer?

🩺 Q382: Which cardiac biomarker remains elevated for the longest duration (up to 10-14 days) following an acute myocardial infarction?

🩺 Q383: What is the primary metabolic defect in a patient with Type 1 Diabetes Mellitus?

🩺 Q384: A patient with severe von Willebrand disease (Type 3) would typically exhibit which of the following coagulation profiles?

🩺 Q385: Which of the following findings on a peripheral blood smear is most characteristic of a patient with severe Hemoglobin H (HbH) disease?

🩺 Q386: In the WHO classification of Myelodysplastic Syndromes (MDS), what is the threshold percentage of blasts in the bone marrow required for a diagnosis of MDS with excess blasts (MDS-EB)?

🩺 Q387: Which clotting factor is not produced in the liver and serves as a cofactor for the activation of Factor X?

🩺 Q388: A patient with megaloblastic anemia secondary to Vitamin B12 deficiency shows hypersegmented neutrophils. What is the mechanism for this morphologic change?

🩺 Q389: Which translocation is pathognomonic for Acute Promyelocytic Leukemia (APL), also known as FAB M3?

🩺 Q390: A patient presents with sudden onset of purpura and a platelet count of 12,000/µL. Peripheral smear shows large platelets but no other abnormalities. What is the most likely diagnosis?

🩺 Q391: A 24-year-old male presents with a painful penile ulcer and tender inguinal lymphadenopathy. A dark-field examination of the lesion is negative. Gram stain of the exudate shows small, pleomorphic, Gram-negative coccobacilli in 'school of fish' arrangements. Which culture medium is required

🩺 Q392: A sputum sample from a patient with chronic pulmonary symptoms shows large, thick-walled yeast cells (8-15 µm) with broad-based budding upon microscopic examination. Which organism is the most likely cause?

🩺 Q393: A crossmatch is performed between a donor unit and a patient's serum. The immediate spin is compatible, but the AHG phase shows agglutination. What is the most likely reason?

🩺 Q394: A pregnant woman is Rh-negative with a negative antibody screen at 28 weeks. She receives Rh immune globulin (RhIG). What is the expected laboratory result if her blood is tested shortly after administration?

🩺 Q395: Which component is the treatment of choice for a patient with von Willebrand disease who is bleeding and has failed to respond to desmopressin?