🩺 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
🩺 Q444: Which histological feature is characteristic of 'Granulation Tissue' during the wound healing process?
Anonymous Quiz
15%
A) Dense collagen bundles
85%
B) Abundant capillaries and fibroblasts
0%
C) Large areas of necrosis
0%
D) Absence of inflammatory cells
🩺 Q445: Which stain is used to identify acid-fast bacilli in histopathology sections, such as Mycobacterium tuberculosis?
Anonymous Quiz
31%
A) Brown-Hopps
54%
B) Fite-Faraco
8%
C) Giemsa
8%
D) Warthin-Starry
🩺 Q446: What is the term for the presence of abnormal cells that have not yet invaded the basement membrane in epithelial tissue?
Anonymous Quiz
15%
A) Metaplasia
23%
B) Dysplasia
62%
Carcinoma in situ
0%
D) Hyperplasia
🩺 Q447: A clinical chemist is evaluating a new automated chemistry analyzer using Beer-Lambert's Law. If the absorbance of a standard solution is 0.400 at a concentration of 10 mg/dL, what is the concentration of a patient sample with an absorbance of 0.600, assuming the path length and absorptivit
Anonymous Quiz
8%
A) 5 mg/dL
67%
B) 12 mg/dL
8%
C) 15 mg/dL
17%
D) 20 mg/dL
🩺 Q448: In an indirect ion-selective electrode (ISE) measurement for sodium, the analyzer introduces a dilution step. How does severe hyperlipidemia affect the measured sodium concentration compared to direct ISE?
Anonymous Quiz
60%
A) It causes a falsely low result (pseudohyponatremia)
10%
B) It causes a falsely high result
10%
C) It has no effect on the measurement
20%
D) It increases the ionic strength, causing a baseline shift
🩺 Q449: During immunophenotyping by flow cytometry, a sample is gated on CD45 vs. Side Scatter. Which population typically exhibits the highest side scatter (SSC) characteristics?
Anonymous Quiz
45%
A) Lymphocytes
18%
B) Monocytes
36%
C) Granulocytes
0%
D) Blasts
🩺 Q449: [Hematology & Hemostasis Case] In automated hematology analyzers, the Coulter impedance principle detects cells by measuring:
Anonymous Quiz
0%
A) Light scatter intensity at 90 degrees
100%
B) Electrical resistance change as non-conductive cells pass an aperture
0%
C) Fluorescence emission after nucleic acid staining
0%
D) Radiofrequency conductivity absorption
🩺 Q451: In serum protein electrophoresis at pH 8.6, which protein migrates the fastest toward the anode?
Anonymous Quiz
36%
Albumin
64%
B) Alpha-1-globulin
0%
C) Beta-globulin
0%
D) Gamma-globulin
🩺 Q451: [Hematology & Hemostasis Case] Which anticoagulant is the gold standard for routine Prothrombin Time (PT) and APTT testing?
Anonymous Quiz
8%
A) K2-EDTA
8%
B) Lithium Heparin
83%
C) Sodium Citrate (3.2%, 0.109 M)
0%
D) Potassium Oxalate
🩺 Q453: In High-Performance Liquid Chromatography (HPLC), what is the function of the 'stationary phase'?
Anonymous Quiz
0%
A) To dissolve the analytes for transport
100%
B) To differentially retard the migration of analytes based on chemical affinity
0%
C) To detect the analytes as they emerge from the column
0%
D) To increase the pressure of the mobile phase