Deck 1: Introduction to Hematology and Basic Laboratory Practice

Question 1

Tube length when referring to the microscope is the:

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

Answer 1

B

Question 2

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

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

Answer 2

D

Question 3

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

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

Answer 3

D

Question 4

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

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

Question 5

Standard deviation is a measurement of precision.

Question 6

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

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

Question 7

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

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 8

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

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

Question 9

Label the parts of the microscope.

Question 10

Control materials are:

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 11

A delta check is a historical reference on samples run in the laboratories.Once a sample fails a delta check, the most obvious corrective action is to:

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 12

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

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 13

Which of the following is not considered a postanalytic variable?

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

Question 14

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

Question 15

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

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 16

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

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

Question 17

Delta checks are used in the hematology laboratory to:

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 18

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

Question 19

Standards and calibrators differ from control materials because:

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 20

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?

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