🩺 Q314: A 32-year-old female presents with recurrent spontaneous abortions and a history of deep vein thrombosis. Laboratory results reveal a prolonged PTT that does not correct upon mixing with normal plasma. Which test is most appropriate to confirm the presence of a lupus anticoagulant?

🩺 Q315: Which enzyme is most specific for liver disease and is typically elevated in obstructive jaundice?

🩺 Q316: A patient with suspected hereditary spherocytosis undergoes an osmotic fragility test. After incubation at 37°C for 24 hours, the osmotic fragility is significantly increased. What is the molecular basis for this increased susceptibility to hemolysis?

🩺 Q317: A patient presents with a serum sodium of 120 mmol/L and serum osmolality of 295 mOsm/kg. What is the most likely cause of this 'pseudohyponatremia'?

🩺 Q318: A peripheral blood smear from a patient with fatigue and lymphadenopathy shows numerous cells with 'hairy' cytoplasmic projections. Tartrate-resistant acid phosphatase (TRAP) staining is positive. What is the diagnosis?

🩺 Q319: In serum protein electrophoresis (SPEP), which fraction is normally the most prominent and migrates closest to the anode?

🩺 Q320: A patient returns from a trip to Southeast Asia and presents with diarrhea. A stool O&P exam reveals large cysts (50-70 µm) with a prominent ciliary covering and a kidney-shaped macronucleus. What is the organism?

🩺 Q320: A patient with suspected primary hyperaldosteronism exhibits hypertension and hypokalemia. Which test is the most appropriate initial screening tool?

🩺 Q322: A 6-year-old child presents with a 'slapped cheek' rash. A laboratory test for parvovirus B19 is ordered. Which marker indicates past infection and immunity?

🩺 Q322: In the Friedewald equation for calculating LDL cholesterol, which lipid fractions are required?

🩺 Q324: A lab technician observes a Gram-positive rod on a blood agar plate that produces a narrow zone of beta-hemolysis and exhibits 'tumbling motility' in a wet mount at room temperature. What is the most likely identity?

🩺 Q324: Which analyte is considered the most specific indicator of glomerular filtration rate (GFR) because it is not significantly reabsorbed or secreted by the renal tubules?

🩺 Q326: During a microscopic examination of a blood smear, a technician identifies crescent-shaped gametocytes. Which species of Plasmodium is most likely present?

🩺 Q326: A patient with obstructive jaundice shows a significant elevation in Alkaline Phosphatase (ALP) and Gamma-glutamyltransferase (GGT). What is the clinical significance of the elevated GGT?

🩺 Q327: A patient with a urinary tract infection has an isolate that is catalase-positive, coagulase-negative, and resistant to novobiocin. What is the most likely organism?

🩺 Q329: On serum protein electrophoresis, a 'monoclonal gammopathy' (M-spike) is identified. Which immunoglobulin class is most frequently associated with this finding in multiple myeloma?

🩺 Q329: Which dermatophyte is characterized by the presence of large, spindle-shaped, thick-walled macroconidia with 5-15 septations?

🩺 Q331: A patient with severe diabetic ketoacidosis presents with a pH of 7.20, low bicarbonate, and low pCO2. What is the primary acid-base disturbance?

🩺 Q331: A sputum sample is cultured on Lowenstein-Jensen medium. After 3 weeks of incubation, buff-colored, rough colonies appear. The organism is acid-fast positive. What is the most likely pathogen?

🩺 Q332: Which glucose assay method is considered the most specific because it uses an enzyme that does not react with other hexoses like galactose or fructose?