The Quizzes about Safety and Quality in the Hematology Laboratory

The function (or functions) of a hematology laboratory is (are) to

confirm the physician’s impression of a possible hematological disorder

establish or rule out a diagnosis

screen for asymptomatic disorders

all of the above

Correct! Wrong!

The major intended purpose of the laboratory safety manual is to

protect the patient and laboratory personnel

protect laboratory and other hospital personnel

comply with local health and state regulatory requirements

comply with OSHA regulations

Correct! Wrong!

Which of the following is not an appropriate safety practice?

Disposing of needles in biohazard, puncture-proof containers

Frequent handwashing

Sterilizing lancets for reuse

Keeping food out of the same areas as specimens

Correct! Wrong!

If a blood specimen is spilled on a laboratory bench or fl oor area, the fi rst step in cleanup should be

wear gloves and a lab coat

absorb blood with disposable towels

clean with freshly prepared 1% chlorine solution

wash with water

Correct! Wrong!

Which of the following procedures is the most basic and effective in preventing nosocomial infections?

Washing hands between patient contacts

Wearing laboratory coats

Isolating infectious patients

Isolating infectious specimens

Correct! Wrong!

The likelihood of infection after exposure to HBV-infected or HIV-infected blood or body fl uids depends on all of the following factors except the

source (anatomical site) of the blood or fluid

concentration of the virus

duration of the contact

presence of nonintact skin

Correct! Wrong!

HBV and HIV may be directly transmitted in the occupational setting by all of the following except

parenteral inoculation with contaminated blood

exposure of intact skin to contaminated blood or certain body fluids

exposure of intact mucous membranes to contaminated blood or certain body fluids

sharing bathroom facilities with an HIV-positive person

Correct! Wrong!

Standard precautions have been instituted in clinical laboratories to prevent _____ exposures of healthcare workers to bloodborne pathogens such as HIV and HBV.

parenteral

nonintact mucous membrane

nonintact skin

all of the above

Correct! Wrong!

Exposure to _____ constitutes the major source of HIV and HBV infection in healthcare personnel.

sputum

blood

urine

semen

Correct! Wrong!

The transmission of HBV is _____ probable than transmission of HIV.

less

Correct! Wrong!

Gloves for medical use may be

sterile or nonsterile

latex or vinyl

used only once

all of the above

Correct! Wrong!

Diluted bleach for disinfecting work surfaces, equipment, and spills should be prepared daily by preparing a _____ dilution of household bleach.

1:5

1:10

1:20

1:100

Correct! Wrong!

The laboratory procedure manual does not need to include

test method, principle of the test, and clinical applications

specimen collection and storage procedures

the name of the supplier of common laboratory chemicals

QC techniques, procedures, normal values, and technical sources of error

Correct! Wrong!

Which of the following statements is not a nonanalytical factor in a Quality Assessment system?

Qualified personnel and established laboratory policies

Monitoring the standard deviation and reporting results of normal and abnormal controls

Maintenance of a procedure manual and the use of appropriate methodology

Preventive maintenance of equipment and correct specimen collection

Correct! Wrong!

In which of the following laboratory situations is a verbal report permissible?

When the patient is going directly to the physician’s offi ce and would like to have the report available

When the report cannot be found at the nurse’s station

When emergency test results are needed by a physician

None of the above

Correct! Wrong!

_____ Accuracy

The value is known in a specimen similar to a patient’s whole blood or serum.

Closeness to the true value

The process of monitoring accuracy

Comparison to a known physical constant

Correct! Wrong!

_____ Calibration

The value is known in a specimen similar to a patient’s whole blood or serum.

Closeness to the true value

The process of monitoring accuracy

Comparison to a known physical constant

Correct! Wrong!

_____ Control

The value is known in a specimen similar to a patient’s whole blood or serum.

Closeness to the true value

The process of monitoring accuracy

Correct! Wrong!

_____ Precision

How close test results are when repeated.

A purified substance of a known composition.

The process of monitoring accuracy and reproducibility of known control results.

The value is unknown.

Correct! Wrong!

_____ Standards

How close test results are when repeated.

A purified substance of a known composition.

The process of monitoring accuracy and reproducibility of known control results.

The value is unknown.

Correct! Wrong!

_____ Quality

How close test results are when repeated.

A purified substance of a known composition.

The process of monitoring accuracy and reproducibility of known control results.

The value is unknown.

Correct! Wrong!

Which of the following is not a function of a quantitative QC program?

Monitors the correct functioning of equipment, reagents, and individual technique

Confirms the correct identity of patient specimens

Compares the accuracy of controls to reference values

Detects shifts in control values

Correct! Wrong!

_____ Mean

The difference between the upper and lower measurements in a series of results

The expression of the position of each test result to the average

The arithmetic average

The degree to which test data vary about the average

Correct! Wrong!

_____ Range

The difference between the upper and lower measurements in a series of results

The expression of the position of each test result to the average

The arithmetic average

The degree to which test data vary about the average

Correct! Wrong!

_____ Variance

The difference between the upper and lower measurements in a series of results

The expression of the position of each test result to the average

The arithmetic average

The degree to which test data vary about the average

Correct! Wrong!

_____ Standard deviation

The difference between the upper and lower measurements in a series of results

The expression of the position of each test result to the average

The arithmetic average

The degree to which test data vary about the average

Correct! Wrong!

The coeffi cient of variation is the

sum of the squared differences from the mean

square root of the variance from the mean

standard deviation expressed as a percentage of the mean

degree to which test data vary about the average

Correct! Wrong!

The z score measures

how many standard deviations a particular number is from the right or left of the mean

the sum of the squared differences from the mean

the square root of the variance from the mean

the expression of the position of each test result to the average

Correct! Wrong!

Acceptable limits of a control value must fall

within ±1 standard deviation of the mean

between 1 and 2 standard deviations of the mean

within ±2 standard deviations of the mean

within ±3 standard deviations of the mean

Correct! Wrong!

A trend change in QC data is

a progressive change all in one direction away from the mean for at least 3 days

an abrupt shift in the control values

scattered variations from the mean

a progressive change in various directions away from the mean for at least 1 week

Correct! Wrong!

A continuously increasing downward variation in a control sample in one direction from the mean can indicate

deterioration of reagents used in the test

deterioration of the control specimen

deterioration of a component in an instrument

all of the above

Correct! Wrong!

Which of the following statements is true of a gaussian curve?

It represents the standard deviation.

It represents the coeffi cient of variation.

It represents variance of a population.

It represents a normal bell-shaped distribution.

Correct! Wrong!

Two standard deviations (2 SD) from the mean in a normal distribution curve would include

99% of all values

95% of all values

75% of all values

68% of all values

Correct! Wrong!

The Quizzes about Safety and Quality in the Hematology Laboratory

The function (or functions) of a hematology laboratory is (are) to

The major intended purpose of the laboratory safety manual is to

Which of the following is not an appropriate safety practice?

If a blood specimen is spilled on a laboratory bench or fl oor area, the fi rst step in cleanup should be

Which of the following procedures is the most basic and effective in preventing nosocomial infections?

The likelihood of infection after exposure to HBV-infected or HIV-infected blood or body fl uids depends on all of the following factors except the

HBV and HIV may be directly transmitted in the occupational setting by all of the following except

Standard precautions have been instituted in clinical laboratories to prevent _____ exposures of healthcare workers to bloodborne pathogens such as HIV and HBV.

Exposure to _____ constitutes the major source of HIV and HBV infection in healthcare personnel.

The transmission of HBV is _____ probable than transmission of HIV.

Gloves for medical use may be

Diluted bleach for disinfecting work surfaces, equipment, and spills should be prepared daily by preparing a _____ dilution of household bleach.

The laboratory procedure manual does not need to include

Which of the following statements is not a nonanalytical factor in a Quality Assessment system?

In which of the following laboratory situations is a verbal report permissible?

_____ Accuracy

_____ Calibration

_____ Control

_____ Precision

_____ Standards

_____ Quality

Which of the following is not a function of a quantitative QC program?

_____ Mean

_____ Range

_____ Variance

_____ Standard deviation

The coeffi cient of variation is the

The z score measures

Acceptable limits of a control value must fall

A trend change in QC data is

A continuously increasing downward variation in a control sample in one direction from the mean can indicate

Which of the following statements is true of a gaussian curve?

Two standard deviations (2 SD) from the mean in a normal distribution curve would include

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