🩺 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.
94%
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.
6%
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
6%
A) FSC measures internal complexity; SSC measures cell volume.
81%
B) FSC measures cell size; SSC measures internal granularity or complexity.
6%
C) FSC measures fluorescence intensity; SSC measures cell viability.
6%
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
19%
Albumin
75%
B) Alpha-1 globulin
6%
C) Beta globulin
0%
D) Gamma globulin
🩺 Q285: In a competitive immunoassay, what is the relationship between the concentration of the patient's analyte and the measured signal?
Anonymous Quiz
31%
A) Directly proportional
31%
B) Inversely proportional
38%
C) Logarithmically proportional
0%
D) No relationship
🩺 Q286: What is the function of the 'mass-to-charge ratio' (m/z) in liquid chromatography-tandem mass spectrometry (LC-MS/MS)?
Anonymous Quiz
19%
A) It determines the solubility of the analyte in the mobile phase.
50%
B) It separates ions based on their flight time through a vacuum.
25%
C) It measures the light absorbance of the ionized molecules.
6%
D) It identifies the specific wavelength of the analyte.
🩺 Q287: The measurement of pO2 in a blood gas analyzer is performed using which type of electrode?
Anonymous Quiz
53%
A) Severinghaus electrode
24%
B) Clark electrode
12%
Calomel electrode
12%
D) Glass pH electrode
🩺 Q288: When balancing a centrifuge, what is the most critical requirement for the safety and longevity of the instrument?
Anonymous Quiz
0%
A) Ensuring the tubes are of the same color.
81%
B) Ensuring the tubes are of the same mass, placed diametrically opposite each other.
19%
C) Ensuring the centrifuge is set to the maximum speed before loading.
0%
D) Ensuring the lid is open during the cycle.
🩺 Q289: A patient returning from a tropical region presents with fever, chills, and anemia. A peripheral blood smear shows ring forms and crescent-shaped gametocytes within RBCs. Which species of Plasmodium is most likely?
Anonymous Quiz
6%
A) Plasmodium vivax
76%
B) Plasmodium falciparum
12%
C) Plasmodium ovale
6%
D) Plasmodium malariae
🩺 Q290: A fungal culture from a lung biopsy shows broad-based budding yeast cells. What is the most likely identification of this dimorphic fungus?
Anonymous Quiz
6%
A) Histoplasma capsulatum
47%
B) Coccidioides immitis
24%
C) Blastomyces dermatitidis
24%
D) Cryptococcus neoformans
🩺 Q291: A patient with the Bombay phenotype (Oh) will have which of the following results in reverse ABO grouping?
Anonymous Quiz
6%
A) No agglutination with A1 or B cells
81%
B) Agglutination with A1, B, and O cells
13%
C) Agglutination only with O cells
0%
D) Agglutination with A1 and B cells only
🩺 Q292: A 35-year-old female presents with malar rash, joint pain, and photosensitivity. Laboratory testing reveals a positive ANA at 1:640 with a rim/peripheral pattern. Which specific antibody is most likely responsible for this staining pattern?
Anonymous Quiz
13%
Anti-centromere
67%
B) Anti-dsDNA
20%
C) Anti-Jo-1
0%
D) Anti-Scl-70
🩺 Q293: A patient develops urticaria and angioedema within minutes of receiving an intravenous infusion of a monoclonal antibody. Which mechanism of hypersensitivity is primarily involved?
Anonymous Quiz
6%
A) Type I: IgE-mediated
31%
B) Type II: Cytotoxic
56%
C) Type III: Immune complex deposition
6%
D) Type IV: T-cell mediated
🩺 Q294: A 12-month-old male with recurrent sinopulmonary infections is evaluated. Flow cytometry shows a total absence of mature B cells (CD19+), but T cell numbers are normal. What is the most likely diagnosis?
Anonymous Quiz
11%
A) Common Variable Immunodeficiency (CVID)
72%
B) Severe Combined Immunodeficiency (SCID)
11%
C) X-linked Agammaglobulinemia (Bruton's)
6%
DiGeorge Syndrome