Question 1

Which of the following represents an example of a safety violation in the laboratory?

Accepted Answer

A)   Application of cosmetics
B)   Mouth pipetting
C)   Consuming bottled water
D)   All the above D

Question 2

Accuracy is a measurement of the true value of an analyte.

Accepted Answer

A) True 
 B)False  True

Question 3

Tube length when referring to the microscope is the:

Accepted Answer

A)   Resolution power of the objective
B)   Distance from the eyepiece to the objective
C)   Numerical aperture
D)   Magnitude of the image on the stage B

Question 4

The average of a group of data points is defined as the:

Accepted Answer

A)   Mean
B)   Mode
C)   Median
D)   Modicum

Question 5

Delta checks are used in the hematology laboratory to:

Accepted Answer

A)   Compare past patient results to the current result
B)   Verify control accuracy
C)   Establish a target range
D)   Establish reference ranges for a particular analyte

Question 6

Control materials are:

Accepted Answer

A)   Analyzed concurrently with the unknown samples
B)   Substances with a known amount of analyte
C)   Used to calibrate the method
D)   All of the above

Question 7

Safety training is part of new employee training in health care and includes:

Accepted Answer

A)   Biological hazards
B)   Chemical hazards
C)   Environmental hazards
D)   All of the above

Question 8

When handwashing after a patient contact, the soap application process should last at least:

Accepted Answer

A)   5 seconds
B)   15 seconds
C)   20 seconds
D)   30 seconds

Question 9

Which of the following behaviors is a violation of standard precautions?

Accepted Answer

A)   Handwashing after glove removal
B)   Use of impermeable laboratory gowns
C)   Use of goggles and face shields
D)   Placing laboratory notebooks on laboratory work area

Question 10

If the confidence interval for most laboratories is 95.5%, what is the acceptable range for hemoglobin if a hemoglobin control was run with a mean of 12.5 and a standard deviation of 1.0?

Accepted Answer

A)   9.5 to 12.5
B)   10.5 to 14.5
C)   11.5 to 15.5
D)   10.0 to 13.5

Question 11

Which of the following is not considered a postanalytic variable?

Accepted Answer

A)   Delta checks
B)   Proper anticoagulant used
C)   Specimen checked for clots
D)   Critical results called

Question 12

What is the most useful corrective action for the microscope when fine details cannot be visualized in immature cells?

Accepted Answer

A)   Open up diaphragm for maximum light.
B)   Wipe off lenses with lens cleaner.
C)   Get a new slide.
D)   Move to a lower power.

Question 13

A normal distribution curve will have 99.7% of the measured values fall within 2 SDs.

Accepted Answer

A) True 
 B)False

Question 14

Standards and calibrators differ from control materials because:

Accepted Answer

A)   An exact amount of analyte is present in a standard or calibrator
B)   A variable amount of analyte is present depending on patient samples
C)   Standards only need to be within a target range
D)   Standards are run to the best estimate of the known value

Question 15

Which of the following is the definition of a reference interval?

Accepted Answer

A)   A solution of a known amount of analyte
B)   Materials analyzed concurrently with unknown samples
C)   Values established for a particular analyte, given a method, instrument, or patient population
D)   Validation techniques on flagged samples

Question 16

Standard deviation is a measurement of precision.

Accepted Answer

A) True 
 B)False

Question 17

Proper mixing of samples and timely delivery of samples to the laboratory are both examples of:

Accepted Answer

A)   Delta checks
B)   Postanalytic variables
C)   Preanalytic variables
D)   Reflex testing

Question 18

A delta check is a historical reference on samples run in the laboratories.Once a sample fails a delta check, the most obvious corrective action is to:

Accepted Answer

A)   Verify the identification of the patient sample
B)   Reestablish the parameters of the delta check
C)   Perform reflex testing
D)   Perform a manual method

Question 19

Error analysis, standard protocols, and turnaround time are all part of the:

Accepted Answer

A)   Quality assurance system
B)   Quality control program
C)   Reference standards
D)   Delta check protocol

Question 20

Label the parts of the microscope.

Accepted Answer

The answer of Label the parts of the microscope....

Exam 1: Introduction to Hematology and Basic Laboratory Practice

Which of the following represents an example of a safety violation in the laboratory?

Accuracy is a measurement of the true value of an analyte.

Tube length when referring to the microscope is the:

The average of a group of data points is defined as the:

Delta checks are used in the hematology laboratory to:

Control materials are:

Safety training is part of new employee training in health care and includes:

When handwashing after a patient contact, the soap application process should last at least:

Which of the following behaviors is a violation of standard precautions?

If the confidence interval for most laboratories is 95.5%, what is the acceptable range for hemoglobin if a hemoglobin control was run with a mean of 12.5 and a standard deviation of 1.0?

Which of the following is not considered a postanalytic variable?

What is the most useful corrective action for the microscope when fine details cannot be visualized in immature cells?

A normal distribution curve will have 99.7% of the measured values fall within 2 SDs.

Standards and calibrators differ from control materials because:

Which of the following is the definition of a reference interval?

Standard deviation is a measurement of precision.

Proper mixing of samples and timely delivery of samples to the laboratory are both examples of:

A delta check is a historical reference on samples run in the laboratories.Once a sample fails a delta check, the most obvious corrective action is to:

Error analysis, standard protocols, and turnaround time are all part of the:

Label the parts of the microscope.