🩺 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
🩺 Q295: In the serological evaluation of a patient with suspected Hepatitis B infection, which marker indicates high infectivity?
Anonymous Quiz
33%
Anti-HBs
25%
B) HBeAg
38%
C) Anti-HBc IgM
4%
D) Anti-HBe
🩺 Q296: A 'delta check' is a quality assurance tool used in the laboratory. What is the primary purpose of this monitoring process?
Anonymous Quiz
30%
A) To compare the current patient result with the previous result from the same patient.
55%
B) To compare the laboratory's result with a reference laboratory's result.
5%
C) To evaluate the precision of the analyzer over a 24-hour period.
10%
D) To verify the calibration of the instrument using known standards.
🩺 Q297: A 55-year-old patient with suspected nephrolithiasis undergoes a 24-hour urine collection. The lab notes the specimen was collected without acid preservation. If the patient has hyperoxaluria, which analyte measurement is most likely to be falsely depressed due to the lack of acidification?
Anonymous Quiz
4%
A) Calcium
78%
B) Uric acid
13%
Creatinine
4%
D) Phosphate