In a colorimetric assay, what is the primary purpose of generating a standard curve?
Anonymous Quiz
7%
A) To determine the sample's color intensity
69%
B) To relate absorbance to known concentrations for quantification
24%
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
81%
A) Crystal violet -> iodine -> decolorization with ethanol -> safranin
13%
B) Crystal violet -> safranin -> iodine -> decolorization
4%
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
61%
B) Negative control
13%
C) Substrate control
4%
D) Enzyme control
What does hematoxylin primarily stain in tissue sections?
Anonymous Quiz
16%
A) Cytoplasmic proteins
78%
B) Nucleic acids (basophilic nuclei)
4%
C) Collagen fibers
2%
D) Lipids
Which of the following is most likely associated with a positive nitrite dipstick result?
Anonymous Quiz
4%
A) Leukocyte esterase
16%
B) Urobilinogen
76%
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
18%
B) Rouleaux interference
59%
C) Cold agglutinins (IgM)
18%
D) Hemolytic disease of the newborn
Which of the following is a key step in maintaining pipette accuracy?
Anonymous Quiz
22%
A) Calibration with water at room temperature
56%
B) Regular adjustment of the display to the measured value
2%
C) Using a rubber tip only
20%
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
92%
B) Handling, exposure controls, and emergency measures
6%
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
62%
A) Macrocytic anemia
25%
B) Microcytic anemia
11%
C) Normocytic anemia
2%
D) Hypochromic anemia
Which lipid parameter is most dependent on fasting state for accurate measurement?
Anonymous Quiz
8%
A) HDL cholesterol
65%
B) LDL cholesterol calculated from triglycerides
20%
C) Triglycerides
8%
D) Total cholesterol
Which organism is typically oxidase positive?
Anonymous Quiz
25%
A) Escherichia coli
47%
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
21%
C) IgM
2%
D) IgE
Which fixative is commonly used for Pap smear slide preservation?
Anonymous Quiz
21%
A) Formalin
66%
B) Ethanol-based fixative
9%
C) Methanol
4%
D) Glutaraldehyde
Which finding in urine sediment is most specific for glomerular disease?
Anonymous Quiz
32%
A) Erythrocyte casts
4%
B) Bacteria
54%
C) Calcium oxalate crystals
11%
D) Uric acid crystals
Which antibody is commonly implicated in hemolytic disease of the fetus and newborn due to the Rh(D) antigen?
Anonymous Quiz
7%
A) Anti-A
15%
B) Anti-B
76%
C) Anti-D (Rh)
2%
D) Anti-Kell
What is the primary purpose of Westgard rules in internal quality control?
Anonymous Quiz
4%
A) To set unit conversion factors
85%
B) To identify outside the control limits and false rejection/acceptance
9%
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
11%
A) BSL-1
65%
B) BSL-2
18%
C) BSL-3
5%
D) BSL-4
❤1
Which test assesses platelet function rather than platelet number?
Anonymous Quiz
3%
A) CBC
89%
B) Platelet aggregation studies
7%
C) PT
2%
D) aPTT
Which parameter indicates the average volume of a red blood cell?
Anonymous Quiz
60%
A) MCV
11%
B) MCH
18%
C) MCHC
11%
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
7%
A) Decreased production
12%
B) Ineffective erythropoiesis
75%
C) Adequate marrow response with blood loss or hemolysis
7%
D) Iron deficiency