🩺 Q417: A 45-year-old female presents with malar rash and joint pain. ANA testing is positive (1:640, speckled). Which secondary confirmatory test is most specific for Systemic Lupus Erythematosus (SLE) in this context?
Anonymous Quiz
67%
Anti-dsDNA
33%
B) Anti-centromere
0%
C) Anti-Scl-70
0%
D) Anti-Jo-1
🩺 Q418: A patient develops a rash and fever 10 days after receiving horse-derived antithymocyte globulin. This clinical presentation is indicative of which hypersensitivity mechanism?
Anonymous Quiz
30%
A) Type I (IgE mediated)
30%
B) Type II (Cytotoxic)
30%
C) Type III (Immune Complex)
10%
D) Type IV (Delayed)
🩺 Q419: A 6-month-old infant presents with recurrent sinopulmonary infections. Serum protein electrophoresis shows a near-total absence of gamma globulins. Flow cytometry reveals a lack of CD19+ cells. What is the diagnosis?
Anonymous Quiz
0%
A) Common Variable Immunodeficiency
100%
B) X-linked Agammaglobulinemia (Bruton's)
0%
C) Severe Combined Immunodeficiency
0%
DiGeorge Syndrome
🩺 Q420: Which of the following cells is characterized by a large, eccentric nucleus and is the largest cell seen in normal urine sediment?
Anonymous Quiz
50%
A) Renal tubular epithelial cell
40%
B) Transitional epithelial cell
0%
C) Squamous epithelial cell
10%
D) White blood cell
🩺 Q421: What is the principle of the reagent strip test for protein (albumin)?
Anonymous Quiz
0%
A) Copper reduction
60%
B) Protein error of indicators
40%
C) Diazotization reaction
0%
D) Enzymatic oxidation
🩺 Q422: A patient with acute glomerulonephritis would most likely show which finding in their urine sediment?
Anonymous Quiz
40%
A) Waxy casts
20%
B) Red blood cell casts
40%
C) Triple phosphate crystals
0%
D) Bacteria and yeast
🩺 Q423: A Pap smear shows cells with enlarged, hyperchromatic nuclei, irregular nuclear membranes, and a high nuclear-to-cytoplasmic ratio. This is most suggestive of:
Anonymous Quiz
70%
A) High-grade squamous intraepithelial lesion (HSIL)
20%
B) Reactive squamous metaplasia
10%
C) Atrophic vaginitis
0%
D) Trichomonas infection
🩺 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
46%
A) It is secreted by the renal tubules in proportion to GFR
38%
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
54%
A) Chylomicrons
23%
B) VLDL
23%
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
8%
A) Heat fractionation at 56°C
58%
B) Electrophoretic separation
33%
C) Measurement of 5'-nucleotidase
0%
D) Inhibition by L-phenylalanine