Which statement is true about urine specific gravity (USG)?
Anonymous Quiz
73%
A) It measures solute concentration and is influenced by hydration
16%
B) It is identical to osmolality
4%
C) It is not affected by hydration
7%
D) It measures pH
Numerous squamous epithelial cells in a urine sediment sample most likely indicate:
Anonymous Quiz
6%
A) Concentrated urine
81%
B) Contamination from the external genitalia/urethra
9%
C) Pyelonephritis
4%
D) Glomerulonephritis
Which transfusion reaction is most likely with ABO-incompatible plasma transfusion?
Anonymous Quiz
46%
A) Febrile non-hemolytic
34%
B) Acute hemolytic
10%
C) Delayed hemolytic
10%
D) Allergic
RhD immune globulin is indicated in which situation?
Anonymous Quiz
20%
A) Rh-positive mother with an Rh-positive fetus
71%
B) Rh-negative mother carrying an Rh-positive fetus
9%
C) All pregnant women regardless of Rh status
0%
D) Only after a transfusion reaction
Which Westgard rule signals a potential shift when two consecutive control results exceed the same limit (±2 SD)?
Anonymous Quiz
8%
A) 1s rule
68%
B) 2s rule
21%
C) 22s rule
3%
D) R4s rule
Which statement distinguishes calibration from verification in instrument quality control?
Anonymous Quiz
79%
A) Calibration adjusts instrument performance; verification confirmsongoing performance
16%
B) Verification replaces calibration when bias is detected
2%
C) Calibration uses patient samples only
3%
D) Verification increases the calibration frequency unnecessarily
Which PPE is most appropriate when handling volatile solvents in the laboratory?
Anonymous Quiz
3%
A) Safety glasses only
96%
B) Lab coat, gloves, and eye protection; chemical splash goggles; possible respirator
0%
C) None
1%
D) Only gloves
A 30-year-old woman with iron deficiency anemia has a reticulocyte count of 0.8% (normal 0.5-2.5%). This indicates:
Anonymous Quiz
30%
A) Appropriate marrow response to anemia
39%
B) Inadequate marrow response to anemia
26%
C) Marked reticulocytosis due to hemolysis
5%
D) Recent blood loss with transient reticulocytosis
In a colorimetric assay, what is the primary purpose of generating a standard curve?
Anonymous Quiz
8%
A) To determine the sample's color intensity
68%
B) To relate absorbance to known concentrations for quantification
23%
C) To calibrate the spectrophotometer wavelength accuracy
0%
D) To adjust pH of reagents
Which order correctly lists the steps of a conventional Gram stain?
Anonymous Quiz
78%
A) Crystal violet -> iodine -> decolorization with ethanol -> safranin
17%
B) Crystal violet -> safranin -> iodine -> decolorization
3%
C) Iodine -> crystal violet -> decolorization -> safranin
2%
D) Safranin -> crystal violet -> iodine -> decolorization
In an ELISA, which control is essential to validate that a negative result is truly negative?
Anonymous Quiz
22%
A) Positive control
60%
B) Negative control
13%
C) Substrate control
5%
D) Enzyme control
What does hematoxylin primarily stain in tissue sections?
Anonymous Quiz
14%
A) Cytoplasmic proteins
79%
B) Nucleic acids (basophilic nuclei)
5%
C) Collagen fibers
2%
D) Lipids
Which of the following is most likely associated with a positive nitrite dipstick result?
Anonymous Quiz
7%
A) Leukocyte esterase
16%
B) Urobilinogen
74%
C) Bacteriuria due to Gram-negative organisms
4%
D) Proteinuria
Which type of problem usually explains an ABO typing discrepancy due to cold-reactive antibodies?
Anonymous Quiz
4%
A) Secretor status
21%
B) Rouleaux interference
59%
C) Cold agglutinins (IgM)
16%
D) Hemolytic disease of the newborn
Which of the following is a key step in maintaining pipette accuracy?
Anonymous Quiz
20%
A) Calibration with water at room temperature
58%
B) Regular adjustment of the display to the measured value
3%
C) Using a rubber tip only
18%
D) Measuring volume at the instrument's maximum range only
What information is primarily found on a Safety Data Sheet (SDS) for a chemical?
Anonymous Quiz
2%
A) Tax classification
93%
B) Handling, exposure controls, and emergency measures
5%
C) Supplier's marketing details
0%
D) Temperature coefficients
A patient presents with MCV 105 fL, normal MCHC, and elevated RDW. This pattern is most consistent with:
Anonymous Quiz
60%
A) Macrocytic anemia
28%
B) Microcytic anemia
10%
C) Normocytic anemia
2%
D) Hypochromic anemia
Which lipid parameter is most dependent on fasting state for accurate measurement?
Anonymous Quiz
9%
A) HDL cholesterol
67%
B) LDL cholesterol calculated from triglycerides
18%
C) Triglycerides
7%
D) Total cholesterol
Which organism is typically oxidase positive?
Anonymous Quiz
26%
A) Escherichia coli
46%
B) Streptococcus pyogenes
22%
C) Neisseria meningitidis
6%
D) Listeria monocytogenes
Which antibody isotype is primarily responsible for mucosal immunity?
Anonymous Quiz
2%
A) IgG
75%
B) IgA
22%
C) IgM
2%
D) IgE