The Quizzes about Safety and Quality in the Hematology Laboratory

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The Quizzes about Safety and Quality in the Hematology Laboratory
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Select the ONE answer that is BEST in each case.

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

 

1. The function (or functions) of a hematology laboratory is (are) to
A. confirm the physician’s impression of a possible hematological disorder
B. establish or rule out a diagnosis
C. screen for asymptomatic disorders
D. all of the above
2. The major intended purpose of the laboratory safety manual is to
A. protect the patient and laboratory personnel
B. protect laboratory and other hospital personnel
C. comply with local health and state regulatory requirements
D. comply with OSHA regulations
3. Which of the following is not an appropriate safety practice?
A. Disposing of needles in biohazard, puncture-proof containers
B. Frequent handwashing
C. Sterilizing lancets for reuse
D. Keeping food out of the same areas as specimens
4. If a blood specimen is spilled on a laboratory bench or floor area, the fi rst step in cleanup should be
A. wear gloves and a lab coat
B. absorb blood with disposable towels
C. clean with freshly prepared 1% chlorine solution
D. wash with water
5. Which of the following procedures is the most basic and effective in preventing nosocomial infections?
A. Washing hands between patient contacts
B. Wearing laboratory coats
C. Isolating infectious patients
D. Isolating infectious specimens
6. The likelihood of infection after exposure to HBV-infected or HIV-infected blood or body fluids depends on all of the following factors except the
A. source (anatomical site) of the blood or fluid
B. concentration of the virus
C. duration of the contact
D. presence of nonintact skin
7. HBV and HIV may be directly transmitted in the occupational setting by all of the following except
A. parenteral inoculation with contaminated blood
B. exposure of intact skin to contaminated blood or
certain body fluids
C. exposure of intact mucous membranes to contaminated blood or certain body fluids
D. sharing bathroom facilities with an HIV-positive
person
8. Standard precautions have been instituted in clinical laboratories to prevent _____ exposures of healthcare workers to bloodborne pathogens such as HIV and HBV.
A. parenteral
B. nonintact mucous membrane
C. nonintact skin
D. all of the above
9. Exposure to _____ constitutes the major source of HIV and HBV infection in healthcare personnel.
A. sputum
B. blood
C. urine
D. semen
10. The transmission of HBV is _____ probable than transmission of HIV.
A. less
B. more
11. Gloves for medical use may be
A. sterile or nonsterile
B. latex or vinyl
C. used only once
D. all of the above
Diluted bleach for disinfecting work surfaces, equipment, and spills should be prepared daily by preparing a _____  dilution of household bleach.

A. 1:5
B. 1:10
C. 1:20
D. 1:100

14. The laboratory procedure manual does not need to include
A. test method, principle of the test, and clinical applications
B. specimen collection and storage procedures
C. the name of the supplier of common laboratory chemicals
D. QC techniques, procedures, normal values, and technical sources of error
15. Which of the following statements is not a nonanalytical factor in a Quality Assessment system?
A. Qualified personnel and established laboratory policies
B. Monitoring the standard deviation and reporting results of normal and abnormal controls
C. Maintenance of a procedure manual and the use of appropriate methodology
D. Preventive maintenance of equipment and correct specimen collection
16. In which of the following laboratory situations is a verbal report permissible?
A. When the patient is going directly to the physician’s office and would like to have the report available
B. When the report cannot be found at the nurse’s station
C. When emergency test results are needed by a physician
D. None of the above
17 _____ Accuracy

A. The value is known in a specimen similar to a patient’s whole blood or serum.
B. Closeness to the true value
C. The process of monitoring accuracy
D. Comparison to a known physical constant

18 _____ Accuracy

A. The value is known in a specimen similar to a patient’s whole blood or serum.
B. Closeness to the true value
C. The process of monitoring accuracy
D. Comparison to a known physical constant

19 _____ Control

A. The value is known in a specimen similar to a patient’s whole blood or serum.
B. Closeness to the true value
C. The process of monitoring accuracy
D. Comparison to a known physical constant

20. _____ Precision

A. How close test results are when repeated.
B. A purified substance of a known composition.
C. The process of monitoring accuracy and reproducibility of known control results.
D. The value is unknown.

21. _____ Standards

A. How close test results are when repeated.
B. A purified substance of a known composition.
C. The process of monitoring accuracy and reproducibility of known control results.
D. The value is unknown.

22. _____ Quality

A. How close test results are when repeated.
B. A purified substance of a known composition.
C. The process of monitoring accuracy and reproducibility of known control results.
D. The value is unknown.

23. Which of the following is not a function of a quantitative QC program?
A. Monitors the correct functioning of equipment, reagents, and individual technique
B. Confirms the correct identity of patient specimens
C. Compares the accuracy of controls to reference values
D. Detects shifts in control values
24. _____ Mean

A. The difference between the upper and lower measurements in a series of results
B. The expression of the position of each test result to the average
C. The arithmetic average
D. The degree to which test data vary about the average

25. _____ Range

A. The difference between the upper and lower measurements in a series of results
B. The expression of the position of each test result to the average
C. The arithmetic average
D. The degree to which test data vary about the average

26. _____ Variance

A. The difference between the upper and lower measurements in a series of results
B. The expression of the position of each test result to the average
C. The arithmetic average
D. The degree to which test data vary about the average

27. _____ Standard deviation

A. The difference between the upper and lower measurements in a series of results
B. The expression of the position of each test result to the average
C. The arithmetic average
D. The degree to which test data vary about the average

28. The coeffi cient of variation is the
A. sum of the squared differences from the mean
B. square root of the variance from the mean
C. standard deviation expressed as a percentage of the mean
D. degree to which test data vary about the average
29. The z score measures
A. how many standard deviations a particular number is from the right or left of the mean
B. the sum of the squared differences from the mean
C. the square root of the variance from the mean
D. the expression of the position of each test result to the average
30. Acceptable limits of a control value must fall
A. within ±1 standard deviation of the mean
B. between 1 and 2 standard deviations of the mean
C. within ±2 standard deviations of the mean
D. within ±3 standard deviations of the mean
31. A trend change in QC data is
A. a progressive change all in one direction away from the mean for at least 3 days
B. an abrupt shift in the control values
C. scattered variations from the mean
D. a progressive change in various directions away from the mean for at least 1 week
32. A continuously increasing downward variation in a control sample in one direction from  the mean can indicate
A. deterioration of reagents used in the test
B. deterioration of the control specimen
C. deterioration of a component in an instrument
D. all of the above
33. Which of the following statements is true of a gaussian curve?
A. It represents the standard deviation.
B. It represents the coeffi cient of variation.
C. It represents variance of a population.
D. It represents a normal bell-shaped distribution.
34. Two standard deviations (2 SD) from the mean in a normal distribution curve would include
A. 99% of all values
B. 95% of all values
C. 75% of all values
D. 68% of all values

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