🩺 Q215: A microtome section exhibits 'chatter' or 'washboarding'. What is the most common cause of this artifact?
Anonymous Quiz
13%
A) Dull microtome knife
7%
B) Tissue is too soft
80%
C) Incorrect blade angle (clearance angle)
0%
D) Over-processing of tissue
🩺 Q216: Which stain is utilized specifically to demonstrate the presence of amyloid deposits in tissue biopsies?
Anonymous Quiz
18%
A) Masson’s Trichrome
65%
B) Congo Red
18%
C) Verhoeff-Van Gieson
0%
D) Prussian Blue
🩺 Q217: What is the purpose of using a mordant in a staining procedure?
Anonymous Quiz
6%
A) To increase the contrast of the stain
82%
B) To act as a link between the tissue and the dye
0%
C) To bleach the tissue
12%
D) To act as a counterstain
🩺 Q218: In a fine-needle aspiration (FNA) of a thyroid nodule, which finding is highly suggestive of Papillary Thyroid Carcinoma?
Anonymous Quiz
31%
A) Orphan Annie eye nuclei
56%
B) Follicular architecture
6%
C) Hurthle cells
6%
D) Amyloid stroma
🩺 Q219: What is the result if tissue is inadequately dehydrated before clearing in xylene?
Anonymous Quiz
0%
A) The tissue will be too hard to cut
88%
B) The paraffin will not infiltrate the tissue properly
13%
C) The tissue will shrink excessively
0%
D) The tissue will stain too intensely
🩺 Q220: Which principle is utilized by most automated hematology analyzers to count and size erythrocytes and platelets?
Anonymous Quiz
0%
A) Flow cytometry
100%
B) Coulter principle (Electrical Impedance)
0%
C) Spectrophotometry
0%
D) Reflectance photometry
🩺 Q221: In real-time PCR, what does the 'Ct value' (cycle threshold) represent?
Anonymous Quiz
6%
A) The final concentration of the PCR product at the end of 40 cycles.
81%
B) The number of cycles required for the fluorescent signal to exceed the background noise.
0%
C) The temperature at which the DNA strands separate.
13%
D) The total time required for the PCR reaction to complete.
🩺 Q222: Which colligative property is most commonly measured by freezing point depression osmometers in clinical laboratories?
Anonymous Quiz
6%
A) Vapor pressure
31%
Boiling point elevation
13%
C) Osmotic pressure
50%
D) Freezing point depression
🩺 Q223: According to Westgard rules, which rule violation is indicative of a systematic error?
Anonymous Quiz
19%
A) 1-2s
38%
B) 1-3s
25%
C) 2-2s
19%
D) R-4s
🩺 Q224: When handling a chemical spill of concentrated acid in the laboratory, what is the correct immediate response?
Anonymous Quiz
0%
A) Neutralize with a strong base like sodium hydroxide.
100%
B) Use an appropriate spill kit, wearing personal protective equipment (PPE), and neutralize with a
0%
C) Dilute the spill with large amounts of tap water immediately.
0%
D) Evacuate the area and wait for it to evaporate.
🩺 Q225: A patient sample is collected in a tube with the wrong additive, leading to hemolysis. How does this affect the potassium result?
Anonymous Quiz
0%
A) Falsely decreases potassium due to dilution.
69%
B) Falsely increases potassium due to intracellular release.
0%
C) No effect on potassium levels.
31%
D) Potassium levels are only affected if the sample is stored at room temperature.
🩺 Q226: What is the primary purpose of a 'Levey-Jennings' chart in laboratory quality control?
Anonymous Quiz
0%
A) To compare patient results to population normals.
87%
B) To monitor the performance of an analytical method over time.
13%
C) To calibrate the instrument at the start of each shift.
0%
D) To calculate the total allowable error (TEa).
🩺 Q227: Which of the following is considered the most effective method for decontaminating laboratory surfaces contaminated with bloodborne pathogens?
Anonymous Quiz
6%
A) 70% Isopropyl alcohol
94%
B) 10% Sodium hypochlorite (bleach)
0%
C) Soap and water
0%
D) UV light exposure
🩺 Q228: What does the 'analytical sensitivity' of a clinical assay refer to?
Anonymous Quiz
11%
A) The ability of the test to identify patients with the disease.
89%
B) The lowest concentration of an analyte that can be reliably detected.
0%
C) The ability of the test to exclude patients without the disease.
0%
D) The degree of agreement between replicate measurements.
🩺 Q229: What is a primary requirement for the handling of Proficiency Testing (PT) samples in a clinical laboratory?
Anonymous Quiz
39%
A) PT samples must be analyzed by the same staff and methods as routine patient samples.
44%
B) PT samples should be tested by the supervisor to ensure accuracy.
11%
C) PT samples can be shared with other laboratories to compare results.
6%
D) PT samples should be treated with special reagents not used for patient samples.
🩺 Q230: If a control result falls outside 3 standard deviations (1-3s rule), what does this indicate?
Anonymous Quiz
0%
A) The system is in control.
78%
B) A random error has likely occurred.
22%
C) A systematic error is present.
0%
D) The reagent has expired.
🩺 Q231: What is the purpose of a Safety Data Sheet (SDS) in the laboratory?
Anonymous Quiz
6%
A) To provide information on the clinical utility of a test.
83%
B) To outline the hazard profile, handling precautions, and emergency procedures for a chemical.
11%
C) To list the maintenance schedule for laboratory instrumentation.
0%
D) To record the results of annual competency assessments.
🩺 Q232: Which of the following is an example of a 'pre-analytical' error?
Anonymous Quiz
11%
A) Incorrect instrument calibration.
26%
B) Reporting a result for the wrong patient.
58%
C) Using an incorrect tube type for the requested test.
5%
D) A clerical error in the laboratory information system.
🩺 Q233: When using the cyanmethemoglobin method for hemoglobin determination, what reagent is used to convert hemoglobin to hemiglobincyanide?
Anonymous Quiz
0%
A) Sodium chloride and hydrochloric acid
82%
B) Potassium ferricyanide and potassium cyanide
12%
C) Drabkin's reagent with sodium azide
6%
D) Surfactants and hydrogen peroxide
🩺 Q234: Which of the following findings is considered a definitive WHO criterion for the diagnosis of Polycythemia Vera?
Anonymous Quiz
0%
A) Elevated serum erythropoietin levels
78%
B) Presence of JAK2 V617F mutation
11%
C) Increased marrow iron stores
11%
D) Presence of Philadelphia chromosome