What is the primary purpose of Westgard rules in internal quality control?
Anonymous Quiz
5%
A) To set unit conversion factors
85%
B) To identify outside the control limits and false rejection/acceptance
8%
C) To calibrate instruments
2%
D) To schedule maintenance
Which biosafety level requires work with human blood in risk group 2 agents, use of Class II biological safety cabinet, and restricted access?
Anonymous Quiz
10%
A) BSL-1
66%
B) BSL-2
19%
C) BSL-3
5%
D) BSL-4
❤1
Which test assesses platelet function rather than platelet number?
Anonymous Quiz
6%
A) CBC
85%
B) Platelet aggregation studies
8%
C) PT
2%
D) aPTT
Which parameter indicates the average volume of a red blood cell?
Anonymous Quiz
60%
A) MCV
12%
B) MCH
16%
C) MCHC
12%
D) RDW
A reticulocyte count is used to assess bone marrow response in anemia. If the reticulocyte percentage is elevated with anemia, which scenario is most likely?
Anonymous Quiz
6%
A) Decreased production
11%
B) Ineffective erythropoiesis
76%
C) Adequate marrow response with blood loss or hemolysis
6%
D) Iron deficiency
ALT is typically more liver-specific than AST. Which statement is true?
Anonymous Quiz
22%
A) AST higher in alcoholic liver disease
27%
B) ALT higher in alcoholic liver disease
51%
C) AST/ALT ratio > 2 indicates alcoholic liver disease
0%
D) ALT is not a transaminase
Which morphology and Gram reaction are typical for Staphylococcus aureus?
Anonymous Quiz
23%
A) Gram-positive cocci in chains
13%
B) Gram-negative diplococci
58%
C) Gram-positive cocci in clusters
6%
D) Gram-positive rods
In an indirect ELISA, what is the role of the secondary antibody?
Anonymous Quiz
17%
A) Binding antigen
44%
B) Detecting human antibodies
22%
C) Blocking non-specific sites
16%
D) Enzymatic substrate
Which dye provides blue-purple nuclear staining in standard H&E staining?
Anonymous Quiz
14%
A) Eosin
77%
B) Hematoxylin
6%
C) DAB
3%
D) Wright's stain
What is the primary purpose of a Levey-Jennings chart in clinical labs?
Anonymous Quiz
19%
A) Schedule instrument maintenance
73%
B) Track control results over time
5%
C) Record patient results
3%
D) Calibrate instrument
Which antibody is responsible for RhD antigen incompatibility?
Anonymous Quiz
2%
A) Anti-A
12%
B) Anti-B
82%
C) Anti-D
5%
D) Anti-K
Which statement correctly distinguishes calibration from verification?
Anonymous Quiz
8%
A) Calibration is for routine operation check
13%
B) Verification adjusts instrument to correct bias
77%
C) Calibration establishes instrument accuracy using standards
2%
D) Verification is not required for clinical equipment
What does the flammable symbol on a chemical label indicate?
Anonymous Quiz
14%
A) Health hazard
58%
B) Fire hazard
21%
C) Acute toxicity
8%
D) Corrosive
Frozen section is used intraoperatively to provide rapid diagnosis by performing...
Anonymous Quiz
2%
A) Immunostaining
38%
B) Formalin-fixed paraffin embedding
59%
C) Rapid histologic evaluation on frozen tissue
2%
D) Electron microscopy
❤1
Which test is used as a screening test for systemic autoimmune diseases and can show homogeneous, speckled, nucleolar patterns?
Anonymous Quiz
6%
A) RF
86%
B) ANA by indirect immunofluorescence
5%
C) CRP
3%
D) Complement levels
Which CSF finding is most suggestive of bacterial meningitis?
Anonymous Quiz
3%
A) Normal glucose
81%
B) Elevated protein with low glucose
13%
C) Lymphocytic predominance
3%
D) Normal cell count
In Kirby-Bauer disk diffusion, what does a larger zone of inhibition indicate?
Anonymous Quiz
7%
A) Higher bacterial resistance
19%
B) Lower antibiotic effectiveness
72%
C) Higher susceptibility of bacteria to the antibiotic
1%
D) Higher inoculum
What is the primary purpose of irradiating blood products?
Anonymous Quiz
7%
A) Inactivate pathogens
75%
B) Prevent graft-versus-host disease
3%
C) Extend shelf life
15%
D) Improve oxygen carrying capacity
In thrombocytopenia, which statement about MPV helps differentiate production vs destruction?
Anonymous Quiz
6%
A) Platelet count alone is sufficient
80%
B) MPV is elevated with increased peripheral destruction
11%
C) MPV is elevated only in production defects
3%
D) MPV has no diagnostic value
Which measurements are required to calculate LDL cholesterol using the Friedewald equation?
Anonymous Quiz
3%
A) Total cholesterol only
13%
B) HDL cholesterol only
10%
C) Triglycerides only
75%
D) Total cholesterol, HDL cholesterol, and triglycerides