Clinical Laboratory Chemistry 2nd Edition Sunheimer Test Bank Clinical Laboratory Chemistry, 2e (Sunheimer) Chapter 1 Laboratory Basics
1) Ion-exchange filters remove which of the following from a water source?
- Ions to reduce the mineral content of water
- Lead
- Organic solvents.
- Bacteria
Answer: A
2) Activated carbon filters remove:
- Ions from water.
- Organic compounds from water.
- Acids and bases from water.
- Large particulates from water.
Answer: B
3) A 0.22-micron filter will remove:
- Particles with a diameter of 0.01 microns.
- Particles with a diameter of 0.01 nanometers.
- Particles with a diameter of 2.2 microns.
- Only sodium chloride crystals.
Answer: C
4) The unit of resistivity is:
- Amperes.
- Volts.
- Coulombs.
- MΩ ∙ cm.
Answer: D
5) Microbiological impurities in source water are reported in which format?
- Colony forming units per mL (Cfu/mL)
- Total organic carbon (TOC) in ng/g
- milligrams of SiO2
- Resistivity.
Answer: A
6) According to CLSI, the resistivity of clinical laboratory reagent water (CLRW) must be:
- > 100 milliamps.
- < 10 millivolts.
- > 10 MΩ ∙ cm.
- < 10 MΩ ∙ cm.
Answer: C 1 / 4
7) Which of the following should not be storied in borosilicate glass because it will etch the inside surface of the glass container?
- Saline
- Strong bases (caustics)
- Clinical laboratory reagent water
- Weak acids
Answer: B
8) Low actinic glassware has which of the following properties?
- High thermal resistance with no color added to the glass
- Low thermal resistance with a green-yellow color added as an integral part of the glass
- High thermal resistance with a blue color added as an integral part of the glass
- High thermal resistance with an amber or red color added as an integral part of the glass
Answer: D
9) Care must be taken before selecting polyethylene plastic for use as test tubes and disposable
transfer pipets because:
- Polyethylene can bind or absorb proteins, dyes, stains, and picric acid.
- Polyethylene does not bind or absorb proteins, dyes, stains, and picric acid.
- Polyethylene cannot be used to pipet serum.
- Polyethylene forms insoluble salts in the presence of sodium chloride.
Answer: A
10) Which of the following classes of glassware, including pipets, is manufactured and calibrated to deliver the most accurate volume of liquid?
- A
- B
- AA
- C
Answer: A
11) A to deliver or TD pipet is designed to:
- Allow the user to remove a portion of the sample in the tip for better accuracy.
- Be vigorously tapped against the test tube after all the liquid is removed.
- Drain by gravity.
- Be refilled or rinsed out with the appropriate solvent after the initial liquid has been drained
from the pipet.
Answer: C
12) Which of the following devices is used to calibrate laboratory thermometers?
- Barometer
- Gallium melting point cell
- Titanium freezing point cell
- Platinum cathode voltmeter
Answer: B 2 / 4
13) Convert 75 mg/dL to mg/L.
- 7.5 mg/L
- 75.0 mg/L
- 750 mg/L
- 7500 mg/L
Answer: C
14) Convert 70.0 mg/dL glucose to mmol/L glucose.
- 3.89 mmol/L
- 38.9 mmol/L
- 70.0 mmol/L
- 389 mmol/L
Answer: A
15) If a thermometer reads 39°F, what is the equivalent degree Celsius (°C)?
A) 0.39°C
B) 3.9°C
C) 39°C
D) 40°C
Answer: B
16) Convert 200 picograms to grams.
- 2.0 × 10-10 grams
- 2.0 × 10-8 grams
- 20.0 grams
- 200 grams
Answer: A
17) A patient's calcium result is 8.0 mg/dL. Convert this result to mmol/L.
- 0.004 mmol/L
- 0.20 mmol/L
- 2.0 mmol/L
- 20.0 mmol/L
Answer: C
18) The surface area of a laboratory bench measures 12 square feet. What is the surface area in square meters?
- 1.115 square meters
- 11.15 square meters
- 111.5 square meters
- 1115 square meters
Answer: A 3 / 4
19) What is the weight in kilograms for a 24-hours stool specimen that weighs 0.50 pounds ?
- 0.0226 kilograms
- 0.2265 kilograms
- 2.265 kilograms
- 22.65 kilograms
Answer: B
20) How much serum is required to make a 1 to 4 dilution with a total volume of 100.0 µL ?
A) 0.025 µL
B) 0.25 µL
C) 2.5 µL
D) 25 µL
Answer: D
21) A patient's creatinine is outside the linear range of the analyzer; 10 µL of serum is added to 90.0 µL of diluent and the diluted sample is reanalyzed. The creatinine value of the diluted sample is 1.0 mg/dL. Which of the following creatinine values is correct?
- 1.0 mg/dL
- 10.0 mg/dL
- 20.0 mg/dL
- 100 mg/dL
Answer: B
22) What is the dilution factor if 10 mL of sample is added to 190 mL of diluent?
- 10
- 19
- 20
- 25
Answer: C
23) A serum creatine kinase is diluted 1/200 with a result of 50 U/L. What is the patients' actual creatine kinase result?
A) 50 U/L
B) 200 U/L
C) 1000 U/L
D) 10,000 U/L
Answer: D
24) How many grams of sodium hydroxide (NaOH) are required to prepare 250 mL of a 1.00 molar (M) solution?
- 2.5 g
- 10.0 g
- 25.0 g
- 100 g
Answer: B
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