🩺 Q154: A patient presenting with fever and an expanding erythema migrans rash undergoes serological evaluation for Lyme disease. The screening ELISA is positive. What is the standard confirmatory test required according to CDC two-tier testing guidelines?

🩺 Q155: A patient with uncontrolled diabetes presents with rapid-onset facial swelling and a black eschar on the nasal turbinate. A biopsy shows broad, non-septate hyphae with right-angle branching. Which organism is the most likely cause?

🩺 Q157: A random urine specimen from a 16-year-old student shows 3+ protein on the dipstick. However, a split 24-hour urine collection demonstrates significant protein excretion during daytime activity but normal protein levels in the overnight recumbent collection. What is the most likely diagnosi

🩺 Q157: A stool culture from a patient with severe bloody diarrhea grows on MacConkey agar as a colorless colony. The isolate is oxidase-negative, non-lactose fermenting, and demonstrates motility at 25°C but is non-motile at 37°C. What is the most likely pathogen?

🩺 Q158: Microscopic examination of urine sediment from a patient developing acute renal failure following aminoglycoside therapy reveals numerous renal tubular epithelial (RTE) cells and muddy brown granular casts. What pathology is indicated by these microscopic findings?

🩺 Q160: Which intestinal protozoan is identified by the presence of a 'falling leaf' motility in a direct wet mount of diarrheal stool?

🩺 Q160: A wet mount examination of fresh unpreserved urine sediment reveals pear-shaped, flagellated organisms exhibiting rapid, directional, jerky motility and an undulating membrane. Which organism is identified?

🩺 Q162: A patient's serum shows a reaction with all reagent red cell panels at 4°C, but the reaction disappears at 37°C. What is the most likely cause?

🩺 Q162: A 55-year-old male presents with elevated serum lipase and amylase. The laboratory reports a significantly increased urine amylase-to-creatinine clearance ratio (ACCR). What is the clinical significance of this finding?

🩺 Q164: A patient experiences fever, chills, and hypotension shortly after the start of a red blood cell transfusion. What is the most likely diagnosis?

🩺 Q164: A patient with suspected metabolic acidosis has the following labs: Na+ 140 mEq/L, Cl- 115 mEq/L, HCO3- 18 mEq/L. What is the calculated anion gap, and what is the likely cause?

🩺 Q165: Which blood group system is associated with the P1PK phenotype and is known to produce naturally occurring cold-reactive IgM antibodies?

🩺 Q167: A peripheral blood smear from a patient with chronic liver disease shows 'spur cells' (acanthocytes). Which biochemical abnormality in the red cell membrane is primarily responsible for their formation?

🩺 Q167: Which antibody is known for its ability to cause severe delayed hemolytic transfusion reactions and is characterized by its tendency to drop below detectable levels in serum?

🩺 Q169: A patient's CBC shows a markedly elevated white blood cell count with a 'leukemoid reaction'. Which finding on the peripheral blood smear would best distinguish this from Chronic Myeloid Leukemia (CML)?

🩺 Q169: What is the purpose of the 'check cells' (IgG-coated red cells) added to negative antiglobulin tests in the Indirect Antiglobulin Test (IAT)?

🩺 Q170: A patient has a prolonged PT and PTT. Mixing studies show correction of both with normal plasma. Which of the following is the most likely cause of this coagulation profile?

🩺 Q172: A mother is Group O, Rh-negative, and her infant is Group A, Rh-positive. What is the most likely cause of the infant's jaundice?

🩺 Q172: Which hormone is responsible for increasing blood glucose levels by stimulating glycogenolysis and gluconeogenesis in the liver?

🩺 Q174: Which blood product is the treatment of choice for a patient with von Willebrand disease who is bleeding?