🩺 Q265: In the analysis of synovial fluid, which crystal appears as needle-shaped and is negatively birefringent under polarized light?
Anonymous Quiz
18%
A) Monosodium urate
65%
B) Calcium pyrophosphate
18%
Cholesterol
0%
D) Hydroxyapatite
🩺 Q266: Which laboratory parameter is the most sensitive screening test for the detection of Disseminated Intravascular Coagulation (DIC)?
Anonymous Quiz
63%
A) Prothrombin time (PT).
6%
B) Fibrinogen level.
19%
C) D-dimer assay.
13%
D) Platelet count.
🩺 Q267: Which fixative is preferred for tissues requiring subsequent immunohistochemical (IHC) staining for estrogen receptors?
Anonymous Quiz
71%
A) 10% Neutral Buffered Formalin.
12%
Bouin’s solution.
12%
C) Zenker’s fluid.
6%
D) Absolute ethanol.
🩺 Q268: In a cervical Papanicolaou (Pap) smear, which cell type is characterized by a high nuclear-to-cytoplasmic (N/C) ratio, hyperchromatic nuclei, and irregular nuclear membranes, suggestive of high-grade squamous intraepithelial lesion (HSIL)?
Anonymous Quiz
24%
A) Superficial squamous cell.
59%
B) Intermediate squamous cell.
6%
C) Dysplastic parabasal cell.
12%
D) Endocervical columnar cell.
🩺 Q269: The Periodic Acid-Schiff (PAS) stain is used to identify which of the following structures in tissue sections?
Anonymous Quiz
0%
A) Elastic fibers.
94%
B) Glycogen and neutral mucopolysaccharides.
6%
C) Hemosiderin deposits.
0%
D) Collagen fibers.
🩺 Q270: A tissue section shows amyloid deposits. Which special stain would show apple-green birefringence under polarized light?
Anonymous Quiz
56%
A) Masson’s Trichrome.
31%
B) Congo Red.
13%
C) Prussian Blue.
0%
D) Von Kossa.
🩺 Q271: What is the primary function of the clearing agent (e.g., xylene) in the tissue processing sequence?
Anonymous Quiz
0%
A) To remove water from the tissue.
94%
B) To remove the dehydrating agent and render the tissue miscible with paraffin wax.
6%
C) To harden the tissue for sectioning.
0%
D) To stain the tissue for better visualization.
🩺 Q272: During microtomy, 'chatter' or vibration marks on a tissue section are most commonly caused by which of the following?
Anonymous Quiz
31%
A) Dull microtome blade or loose blade/block holder.
25%
B) Tissue that is too soft or under-processed.
44%
C) Use of a clearing agent that is not miscible with paraffin.
0%
D) Excessive humidity in the laboratory.
🩺 Q273: When using an Ion-Selective Electrode (ISE) for direct potentiometry to measure sodium, which phenomenon can cause a 'pseudohyponatremia' in a patient with severe hyperlipidemia?
Anonymous Quiz
24%
A) The electrode measures sodium in the total plasma volume, not the aqueous phase.
65%
B) The lipid particles occupy volume, displacing the aqueous phase and leading to a lower concentrat
6%
C) Lipid particles coat the ion-selective membrane, preventing ion diffusion.
6%
D) The instrument fails to account for the chloride concentration in the lipid layer.
🩺 Q274: Which type of microscopy is most effective for identifying unstained crystals in synovial fluid, such as uric acid or calcium pyrophosphate?
Anonymous Quiz
39%
A) Phase-contrast microscopy.
39%
B) Darkfield microscopy.
22%
C) Polarized light microscopy.
0%
D) Fluorescence microscopy.
🩺 Q275: When balancing a centrifuge, what is the primary safety requirement to prevent mechanical failure and ensure efficient separation?
Anonymous Quiz
0%
A) Ensure the tubes are of the same color.
88%
B) Ensure the tubes have the same mass and are placed diametrically opposite.
12%
C) Ensure the tubes are filled to the exact same volume regardless of weight.
0%
D) Ensure the centrifuge lid is locked and the vacuum is engaged.
🩺 Q276: In an automated hematology analyzer, what is the principle of the 'Coulter Principle' used to count cells?
Anonymous Quiz
12%
A) Light scattering as cells pass through a laser beam.
71%
B) Impedance measurement of electrical resistance as cells pass through an aperture.
12%
C) Fluorescence emission after staining with acridine orange.
6%
D) Measurement of hemoglobin concentration via light absorption.
🩺 Q277: Using Westgard Rules, which rule violation is most suggestive of a systematic error (bias) in a laboratory assay?
Anonymous Quiz
19%
A) 1-2s rule.
56%
B) 1-3s rule.
19%
C) 10x rule.
6%
D) R-4s rule.
🩺 Q278: According to the OSHA Hazard Communication Standard, what information must be included in a Safety Data Sheet (SDS) for a chemical reagent?
Anonymous Quiz
0%
A) The price and supplier contact information.
38%
B) The expiration date and lot number of the reagent.
63%
C) Hazard identification, first aid measures, and accidental release measures.
0%
D) The clinical significance of the test performed with the reagent.
🩺 Q279: A laboratory receives proficiency testing (PT) samples. Which of the following actions is considered a violation of CLIA regulations regarding PT?
Anonymous Quiz
6%
A) Testing the PT samples in the same manner as patient specimens.
81%
B) Consulting with another laboratory to confirm results before reporting.
0%
C) Recording the results in the laboratory information system.
13%
D) Reviewing PT results with the technical supervisor.
🩺 Q280: A patient with suspected pheochromocytoma is instructed to collect a 24-hour urine for metanephrines. Which dietary restriction is mandatory to prevent false-positive results?
Anonymous Quiz
0%
Avoidance of high-protein intake
93%
B) Avoidance of bananas, caffeine, and vanilla
7%
C) Avoidance of leafy green vegetables
0%
D) Avoidance of dairy products
🩺 Q281: A patient with unexplained prolonged PT and PTT shows a correction in the 1:1 mixing study. Which factor deficiency is the most likely cause?
Anonymous Quiz
18%
A) Factor VIII
65%
B) Factor IX
12%
C) Factor X
6%
D) Factor V
🩺 Q282: In a clinical chemistry analyzer, a patient sample with a high concentration of an analyte results in an absorbance reading that exceeds the linear range of the instrument. What is the most appropriate action to ensure accurate reporting?
Anonymous Quiz
0%
A) Report the result as 'Greater than the linear range' without dilution.
93%
B) Dilute the specimen with an appropriate diluent, re-analyze, and multiply by the dilution factor.
0%
C) Manually extrapolate the value based on the slope of the calibration curve.
7%
D) Accept the result as it is, assuming the instrument software corrects for non-linearity.
🩺 Q283: A flow cytometer uses side scatter (SSC) and forward scatter (FSC) to characterize cells. What do these two parameters primarily measure?
Anonymous Quiz
7%
A) FSC measures internal complexity; SSC measures cell volume.
80%
B) FSC measures cell size; SSC measures internal granularity or complexity.
7%
C) FSC measures fluorescence intensity; SSC measures cell viability.
7%
D) FSC measures DNA content; SSC measures surface antigen expression.
🩺 Q284: In serum protein electrophoresis at pH 8.6, which protein migrates the fastest toward the anode?
Anonymous Quiz
20%
Albumin
73%
B) Alpha-1 globulin
7%
C) Beta globulin
0%
D) Gamma globulin