🩺 Q424: In a biopsy of the colon, which stain is used specifically to demonstrate mucin-producing adenocarcinoma cells?
Anonymous Quiz
82%
A) Periodic Acid-Schiff (PAS) with diastase
9%
B) Masson trichrome
9%
C) Gomori methenamine silver
0%
D) Prussian blue
🩺 Q425: A fine needle aspiration (FNA) of a thyroid nodule reveals 'orphan Annie' eye nuclei and psammoma bodies. What is the diagnosis?
Anonymous Quiz
55%
A) Papillary thyroid carcinoma
18%
B) Follicular adenoma
27%
C) Medullary thyroid carcinoma
0%
D) Anaplastic thyroid carcinoma
🩺 Q426: Which immunohistochemical marker is commonly used to confirm the diagnosis of Melanoma in a skin biopsy?
Anonymous Quiz
9%
A) S-100
82%
B) Cytokeratin
9%
CD20
0%
Desmin
🩺 Q427: What is the primary function of the 'clearing' agent (e.g., xylene) in the tissue processing sequence?
Anonymous Quiz
83%
A) To remove alcohol and make the tissue receptive to paraffin wax
8%
B) To remove water from the tissue
8%
C) To harden the tissue for sectioning
0%
D) To stain the tissue for microscopic review
🩺 Q428: In a bronchial washing specimen, which feature is most characteristic of malignancy versus reactive bronchial cells?
Anonymous Quiz
83%
A) Irregular, coarse chromatin distribution
17%
B) Presence of cilia
0%
C) Uniform nuclear size
0%
D) Abundant cyanophilic cytoplasm
🩺 Q429: A pathologist requests an Acid-Fast Bacilli (AFB) stain on a lung biopsy specimen. Which stain is the standard for this?
Anonymous Quiz
69%
A) Ziehl-Neelsen
23%
B) Oil Red O
8%
C) Warthin-Starry
0%
D) Congo Red
🩺 Q430: What is the purpose of using a cryostat in an intraoperative consultation (frozen section)?
Anonymous Quiz
67%
A) To provide rapid histological diagnosis
8%
B) To prevent tissue autolysis
25%
C) To allow for permanent paraffin embedding
0%
D) To perform immunohistochemistry
🩺 Q431: Which characteristic of a cell on a Pap smear suggests the presence of Human Papillomavirus (HPV) infection?
Anonymous Quiz
36%
A) Koilocytosis
55%
B) Hyperkeratosis
9%
C) Parakeratosis
0%
Dyskeratosis
🩺 Q432: A patient with suspected pheochromocytoma provides a 24-hour urine sample. Which analyte, when measured via HPLC, provides the highest sensitivity for diagnosis?
Anonymous Quiz
82%
A) Vanillylmandelic acid (VMA)
18%
B) Metanephrines
0%
C) Epinephrine
0%
Dopamine
🩺 Q433: A patient on long-term Digoxin therapy presents with visual halos and nausea. Laboratory results show a serum Digoxin level of 2.8 ng/mL. What is the most likely cause of this toxicity?
Anonymous Quiz
18%
A) Hypokalemia
64%
B) Hypercalcemia
9%
C) Hyponatremia
9%
D) Hypermagnesemia
🩺 Q434: A patient with chronic kidney disease has a high serum cystatin C. Why is this marker increasingly preferred over creatinine for GFR estimation?
Anonymous Quiz
50%
A) It is secreted by the renal tubules in proportion to GFR
33%
B) It is unaffected by muscle mass and dietary protein intake
8%
C) It is filtered by the glomerulus and completely reabsorbed
8%
D) It is an acute phase reactant that reflects systemic inflammation
🩺 Q435: A patient with severe hypertriglyceridemia (2,500 mg/dL) is at high risk for acute pancreatitis. Which lipoprotein particle is predominantly elevated?
Anonymous Quiz
58%
A) Chylomicrons
17%
B) VLDL
25%
C) LDL
0%
D) HDL
🩺 Q436: A patient with metastatic bone disease shows highly elevated Alkaline Phosphatase. How can the laboratory confirm the bone origin of this isoenzyme?
Anonymous Quiz
9%
A) Heat fractionation at 56°C
55%
B) Electrophoretic separation
36%
C) Measurement of 5'-nucleotidase
0%
D) Inhibition by L-phenylalanine
🩺 Q437: A patient presents with altered mental status and a high anion gap metabolic acidosis. Serum osmolality is 340 mOsm/kg. An osmolar gap of 35 mOsm/kg is calculated. What is the most likely ingestion?
Anonymous Quiz
8%
A) Ethanol
58%
B) Ethylene glycol
8%
C) Salicylate
25%
D) Acetaminophen
🩺 Q438: A patient with severe vomiting presents with metabolic alkalosis. Which urine chloride finding would suggest the vomiting as the etiology?
Anonymous Quiz
25%
A) Urine Cl < 20 mmol/L
33%
B) Urine Cl > 40 mmol/L
8%
C) Urine pH > 7.5
33%
D) Urine potassium < 10 mmol/L
🩺 Q439: A blood gas specimen remains at room temperature for 60 minutes before analysis. How will this affect the reported pO2, pCO2, and pH?
Anonymous Quiz
36%
A) pO2 increases, pCO2 increases, pH increases
50%
B) pO2 decreases, pCO2 increases, pH decreases
14%
C) pO2 increases, pCO2 decreases, pH decreases
0%
D) pO2 decreases, pCO2 decreases, pH increases
🩺 Q440: When sectioning paraffin-embedded tissue, what is the most common cause of 'chatter' or horizontal lines on the section?
Anonymous Quiz
25%
A) Dull microtome knife
25%
B) Tissue is too soft
42%
C) Water bath temperature is too low
8%
D) Paraffin is too hard
🩺 Q441: Which stain is best utilized to demonstrate the presence of amyloid deposits in tissue biopsies?
Anonymous Quiz
27%
A) Masson's Trichrome
40%
B) Congo Red
20%
C) Ziehl-Neelsen
13%
D) Grocott Methenamine Silver
🩺 Q442: What is the primary disadvantage of using 10% Neutral Buffered Formalin as a fixative?
Anonymous Quiz
15%
A) It causes significant tissue shrinkage
85%
B) It is not compatible with immunohistochemistry
0%
C) It is slow to penetrate and fix tissue
0%
D) It prevents subsequent DNA extraction
🩺 Q443: In fine needle aspiration (FNA) cytology of the thyroid, which feature is highly suggestive of Papillary Thyroid Carcinoma?
Anonymous Quiz
15%
A) Psammoma bodies
23%
B) Hürthle cells
54%
Colloid-rich background
8%
D) Lymphocytic infiltration