PEARSON CLINICAL LABORATORY SCIENCE SERIES Clinical Laboratory Chemistry Second Edition Sunheimer Graves

Pearson Education, Inc.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>
• > 10 MΩ ∙ cm.
• < 10>

Answer: C

2 Copyright © 2018 Pearson Education, Inc.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

3 Copyright © 2018 Pearson Education, Inc.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