Question 1

Microbiological impurities in source water are reported in which format?

Accepted Answer

A)  Colony forming units per mL (Cfu/mL) 
B)  Total organic carbon (TO
C)  in ng/g 
C)  milligrams of SiO2 
D)  Resistivity. 
A)  Colony forming units per mL (Cfu/mL) 
B)  Total organic carbon (TO
C)  in ng/g 
C)  milligrams of SiO2 
D)  Resistivity. A

Question 2

What is the dilution factor if 10 mL of sample is added to 190 mL of diluent?

Accepted Answer

A)  10 
B)  19 
C)  20 
D)  25 
A)  10 
B)  19 
C)  20 
D)  25 C

Question 3

A serum creatine kinase is diluted 1/200 with a result of 50 U/L. What is the patients' actual creatine kinase result?

Accepted Answer

A)  50 U/L 
B)  200 U/L 
C)  1000 U/L 
D)  10,000 U/L 
A)  50 U/L 
B)  200 U/L 
C)  1000 U/L 
D)  10,000 U/L D

Question 4

Convert 70.0 mg/dL glucose to mmol/L glucose.

Accepted Answer

A)  3.89 mmol/L 
B)  38.9 mmol/L 
C)  70.0 mmol/L 
D)  389 mmol/L 
A)  3.89 mmol/L 
B)  38.9 mmol/L 
C)  70.0 mmol/L 
D)  389 mmol/L

Question 5

Convert 200 picograms to grams.

Accepted Answer

A)  2.0 × 10-10 grams 
B)  2.0 × 10-8 grams 
C)  20.0 grams 
D)  200 grams 
A)  2.0 × 10-10 grams 
B)  2.0 × 10-8 grams 
C)  20.0 grams 
D)  200 grams

Question 6

What is the molality (M) of a solution that contains 330 g of CaCl2 per kilogram?

Accepted Answer

A)  3.0 M 
B)  3.3 M 
C)  33.0 M 
D)  Unable to determine 
A)  3.0 M 
B)  3.3 M 
C)  33.0 M 
D)  Unable to determine

Question 7

What is the weight in kilograms for a 24-hours stool specimen that weighs 0.50 pounds ?

Accepted Answer

A)  0.0226 kilograms 
B)  0.2265 kilograms 
C)  2.265 kilograms 
D)  22.65 kilograms 
A)  0.0226 kilograms 
B)  0.2265 kilograms 
C)  2.265 kilograms 
D)  22.65 kilograms

Question 8

Determine the molarity (M) of a solution if 125 mL of a 3.5 molar (M) solution is diluted to a final volume of 500 mL.

Accepted Answer

A)  0.875 M 
B)  3.50 M 
C)  8.75 M 
D)  10.0 M 
A)  0.875 M 
B)  3.50 M 
C)  8.75 M 
D)  10.0 M

Question 9

Convert 40°C to °F.

Accepted Answer

A)  60°F 
B)  90°F 
C)  100°F 
D)  104°F 
A)  60°F 
B)  90°F 
C)  100°F 
D)  104°F

Question 10

What is the normality (N) of a 1.5 molar (M) H2SO4 solution?

Accepted Answer

A)  1.0 N 
B)  1.5 N 
C)  3.0 N 
D)  36 N 
A)  1.0 N 
B)  1.5 N 
C)  3.0 N 
D)  36 N

Question 11

Care must be taken before selecting polyethylene plastic for use as test tubes and disposable transfer pipets because:

Accepted Answer

A)  Polyethylene can bind or absorb proteins, dyes, stains, and picric acid. 
B)  Polyethylene does not bind or absorb proteins, dyes, stains, and picric acid. 
C)  Polyethylene cannot be used to pipet serum. 
D)  Polyethylene forms insoluble salts in the presence of sodium chloride. 
A)  Polyethylene can bind or absorb proteins, dyes, stains, and picric acid. 
B)  Polyethylene does not bind or absorb proteins, dyes, stains, and picric acid. 
C)  Polyethylene cannot be used to pipet serum. 
D)  Polyethylene forms insoluble salts in the presence of sodium chloride.

Question 12

A patient's calcium result is 8.0 mg/dL. Convert this result to mmol/L.

Accepted Answer

A)  0.004 mmol/L 
B)  0.20 mmol/L 
C)  2.0 mmol/L 
D)  20.0 mmol/L 
A)  0.004 mmol/L 
B)  0.20 mmol/L 
C)  2.0 mmol/L 
D)  20.0 mmol/L

Question 13

How many milliliters (mL) of a 2.0M solution are required to prepare 50 mL of a 0.3M solution?

Accepted Answer

A)  0.075 ml 
B)  0.75 ml 
C)  7.5 ml 
D)  75.0 ml 
A)  0.075 ml 
B)  0.75 ml 
C)  7.5 ml 
D)  75.0 ml

Question 14

A solution contains 45g/100 mL of glucose. It is diluted 1/10 and diluted a second time 1/10. What is the concentration in g/100 mL of the final solution?

Accepted Answer

A)  45.0 g/100mL 
B)  4.50 g/100 mL 
C)  0.45 g/100mL 
D)  0.045 g/100mL 
A)  45.0 g/100mL 
B)  4.50 g/100 mL 
C)  0.45 g/100mL 
D)  0.045 g/100mL

Question 15

According to CLSI, the resistivity of clinical laboratory reagent water (CLRW) must be:

Accepted Answer

A) > 100 milliamps. B) 10 M? ? cm. D) < 10 M? ? cm. A) > 100 milliamps. B) 10 M? ? cm. D) < 10 M? ? cm.

Question 16

Low actinic glassware has which of the following properties?

Accepted Answer

A)  High thermal resistance with no color added to the glass 
B)  Low thermal resistance with a green-yellow color added as an integral part of the glass 
C)  High thermal resistance with a blue color added as an integral part of the glass 
D)  High thermal resistance with an amber or red color added as an integral part of the glass 
A)  High thermal resistance with no color added to the glass 
B)  Low thermal resistance with a green-yellow color added as an integral part of the glass 
C)  High thermal resistance with a blue color added as an integral part of the glass 
D)  High thermal resistance with an amber or red color added as an integral part of the glass

Question 17

Activated carbon filters remove:

Accepted Answer

A)  Ions from water. 
B)  Organic compounds from water. 
C)  Acids and bases from water. 
D)  Large particulates from water. 
A)  Ions from water. 
B)  Organic compounds from water. 
C)  Acids and bases from water. 
D)  Large particulates from water.

Question 18

A 0.22-micron filter will remove:

Accepted Answer

A)  Particles with a diameter of 0.01 microns. 
B)  Particles with a diameter of 0.01 nanometers. 
C)  Particles with a diameter of 2.2 microns. 
D)  Only sodium chloride crystals. 
A)  Particles with a diameter of 0.01 microns. 
B)  Particles with a diameter of 0.01 nanometers. 
C)  Particles with a diameter of 2.2 microns. 
D)  Only sodium chloride crystals.

Question 19

A to deliver or TD pipet is designed to:

Accepted Answer

A)  Allow the user to remove a portion of the sample in the tip for better accuracy. 
B)  Be vigorously tapped against the test tube after all the liquid is removed. 
C)  Drain by gravity. 
D)  Be refilled or rinsed out with the appropriate solvent after the initial liquid has been drained from the pipet. 
A)  Allow the user to remove a portion of the sample in the tip for better accuracy. 
B)  Be vigorously tapped against the test tube after all the liquid is removed. 
C)  Drain by gravity. 
D)  Be refilled or rinsed out with the appropriate solvent after the initial liquid has been drained from the pipet.

Question 20

Ion-exchange filters remove which of the following from a water source?

Accepted Answer

A)  Ions to reduce the mineral content of water 
B)  Lead 
C)  Organic solvents. 
D)  Bacteria 
A)  Ions to reduce the mineral content of water 
B)  Lead 
C)  Organic solvents. 
D)  Bacteria

Exam 1: Laboratory Basics

Microbiological impurities in source water are reported in which format?

What is the dilution factor if 10 mL of sample is added to 190 mL of diluent?

A serum creatine kinase is diluted 1/200 with a result of 50 U/L. What is the patients' actual creatine kinase result?

Convert 70.0 mg/dL glucose to mmol/L glucose.

Convert 200 picograms to grams.

What is the molality (M) of a solution that contains 330 g of CaCl2 per kilogram?

What is the weight in kilograms for a 24-hours stool specimen that weighs 0.50 pounds ?

Determine the molarity (M) of a solution if 125 mL of a 3.5 molar (M) solution is diluted to a final volume of 500 mL.

Convert 40°C to °F.

What is the normality (N) of a 1.5 molar (M) H2SO4 solution?

Care must be taken before selecting polyethylene plastic for use as test tubes and disposable transfer pipets because:

A patient's calcium result is 8.0 mg/dL. Convert this result to mmol/L.

How many milliliters (mL) of a 2.0M solution are required to prepare 50 mL of a 0.3M solution?

A solution contains 45g/100 mL of glucose. It is diluted 1/10 and diluted a second time 1/10. What is the concentration in g/100 mL of the final solution?

According to CLSI, the resistivity of clinical laboratory reagent water (CLRW) must be:

Low actinic glassware has which of the following properties?

Activated carbon filters remove:

A 0.22-micron filter will remove:

A to deliver or TD pipet is designed to:

Ion-exchange filters remove which of the following from a water source?

Safety in the Clinical Chemistry Laboratory

Laboratory Statistics, Method Development and QC

Instrumentation, Laboratory Automation, and Informatics

Immunoassays

Molecular Diagnostics

Carbohydrates

Lipids

Proteins

Enzymes

Nonprotein Nitrogen Questions

Body Water and Electrolyte Homeostasis

Blood Gases, PH, and Acid-Base Balance

Mineral and Bone Metabolism

The Endocrine System

Gastrointestinal Function

Pancreas

Cardiac Function

Liver

Iron, Porphyrins, and Hemoglobin

Therapeutic Drug Monitoring

Toxic Substances

Nutrition and Vitamins

Tumor Markers

Geriatrics

Pediatrics

Filters

What is the molality (M) of a solution that contains 330 g of CaCl₂ per kilogram?

What is the normality (N) of a 1.5 molar (M) H₂SO₄ solution?