Which statement about mean platelet volume (MPV) is correct?
Anonymous Quiz
25%
A) Elevated MPV indicates decreased platelet production
18%
B) MPV measures platelet function only
46%
C) MPV correlates with platelet production by megakaryocytes
11%
D) MPV is unaffected by platelet size
In liver disease assessment, which pattern suggests alcoholic liver disease?
Anonymous Quiz
59%
A) AST > ALT with ratio > 2
22%
B) ALT > AST
9%
C) AST = ALT
9%
D) ALT > AST by 2x
Which statement correctly describes estimated glomerular filtration rate (eGFR)?
Anonymous Quiz
67%
A) eGFR uses age, sex, race, and serum creatinine in equations like CKD-EPI
26%
B) eGFR is measured directly by urine clearance tests
7%
C) eGFR does not require serum creatinine
0%
D) eGFR is only used in pediatrics
Anion gap is calculated as Na – (Cl + HCO3). A high anion gap metabolic acidosis suggests which condition?
Anonymous Quiz
45%
A) Hyperchloremic acidosis from diarrhea
27%
B) Lactic acidosis
16%
C) Respiratory alkalosis
11%
D) Hypoalbuminemia with no acidosis
During Gram staining, decolorization with alcohol that is too brief can yield false Gram-positive results because:
Anonymous Quiz
27%
A) It over-decolorizes
22%
B) It under-decolorizes
12%
C) It kills bacteria
39%
D) It stains Gram-positive with safranin
MacConkey agar differentiates lactose fermenters from non-fermenters among Gram-negative enteric bacteria. Which organism is a lactose fermenter?
Anonymous Quiz
25%
A) Pseudomonas aeruginosa
69%
B) Escherichia coli
3%
C) Proteus mirabilis
3%
D) Salmonella typhi
In an ELISA, which component serves as the blocking step to prevent non-specific binding?
Anonymous Quiz
8%
A) Primary antibody
39%
B) Enzyme conjugate
44%
C) Blocking buffer
8%
D) Substrate solution
Which immunoglobulin is the first antibody produced in a primary immune response and is a pentamer?
Anonymous Quiz
10%
A) IgG
24%
B) IgA
63%
C) IgM
3%
D) IgE
How is a 4-fold rise in antibody titer between acute and convalescent sera interpreted?
Anonymous Quiz
5%
A) Chronic infection
80%
B) Acute infection or recent exposure
14%
C) Vaccination response only
0%
D) No clinical significance
Which sequence correctly describes routine tissue processing before paraffin embedding?
Anonymous Quiz
13%
A) Dehydration, clearing, fixation, infiltration
77%
B) Fixation, dehydration, clearing, infiltration
5%
C) Infiltration, fixation, dehydration, clearing
5%
D) Clearing, fixation, dehydration, infiltration
Which statement about hematoxylin and eosin (H&E) staining is true?
Anonymous Quiz
11%
A) Hematoxylin is acidic and stains light structures
22%
B) Eosin stains nucleic acids blue
66%
C) Hematoxylin stains basophilic structures blue/purple
2%
D) Eosin stains DNA strongly
Which dipstick result combination suggests proteinuria and glycosuria?
Anonymous Quiz
60%
A) Positive protein, positive glucose
27%
B) Positive protein, negative glucose
10%
C) Negative protein, negative glucose
3%
D) Positive glucose only
Which statement is true about urine specific gravity (USG)?
Anonymous Quiz
77%
A) It measures solute concentration and is influenced by hydration
15%
B) It is identical to osmolality
3%
C) It is not affected by hydration
5%
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
8%
C) Pyelonephritis
5%
D) Glomerulonephritis
Which transfusion reaction is most likely with ABO-incompatible plasma transfusion?
Anonymous Quiz
48%
A) Febrile non-hemolytic
33%
B) Acute hemolytic
9%
C) Delayed hemolytic
9%
D) Allergic
RhD immune globulin is indicated in which situation?
Anonymous Quiz
19%
A) Rh-positive mother with an Rh-positive fetus
73%
B) Rh-negative mother carrying an Rh-positive fetus
8%
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
7%
A) 1s rule
71%
B) 2s rule
20%
C) 22s rule
2%
D) R4s rule
Which statement distinguishes calibration from verification in instrument quality control?
Anonymous Quiz
81%
A) Calibration adjusts instrument performance; verification confirmsongoing performance
16%
B) Verification replaces calibration when bias is detected
2%
C) Calibration uses patient samples only
2%
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
95%
B) Lab coat, gloves, and eye protection; chemical splash goggles; possible respirator
0%
C) None
2%
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
29%
A) Appropriate marrow response to anemia
40%
B) Inadequate marrow response to anemia
25%
C) Marked reticulocytosis due to hemolysis
5%
D) Recent blood loss with transient reticulocytosis