End of Chapter Questions, Module 3 Flashcards
An example of a factor in preanalytic testing is
patient identification
An example of a factor in analytic testing is
accuracy in testing
An example of a factor in post-analytic testing is
critical value reporting
Blood from the wrong patient is an example of an error classified as
preanalytic
A specimen collected in the wrong evacuated tube is an example of an error classified as
preanalytic
A quality control value outside of an acceptable limit is an example of an error classified as
analytic
the term accuracy means
How close a test result is to the true value
The term control means
Specimen similar to patient’s blood; known concentration of constituent
The term precision means
how close results are to one another when repeatedly analyzed
The term sensitivity means
subjects with a specific disease or condition produce a positive result
The term specificity means
Subjects without a specific disease or condition produce a negative result
The type of error caused by omitting patient serum or reagent from a test mixture is a
false-negative error
The type of error caused by using dirty glassware is a
false-positive error
The type of error caused by the addition of the wrong reagent is a
false positive or false negative error
The type of error caused by inaccurately recording results is a
false positive or false negative error
The type of error caused by using hemolyzed patient serum is a
false positive error
in a written procedural protocol, the ___ should follow the name of the procedure and name of the test method
principle and purpose of the test
In a written procedural protocol, the ___ should follow the specimen collection and storage information
quality control
In a written procedural protocol, the ___ should follow the list of reagents, supplies, and equipment
procedural protocol
In a written procedural protocol, the ____ should follow the reference values and procedural notes
sources of error
If testing cannot be done within ___ hours of collection, a serum specimen should be frozen at -20 degrees celcius
72
Complement can be inactivated in human serum by heating to ___ degrees celcius
56
A specimen should be reinactivated when more than ___ hours have elapsed since inactivation
4
A graduated pipette can be used when
extreme accuracy is not needed
A meniscus is the
curvature at the top surface of a liquid
Automatic pipettes have the advantage of
being fast
allowing the repetitive measurement of solutions
delivering equal volumes of solutions
A dilution is a(n)?
Ratio of volume or number of parts of the substance to be diluted in the total volume, or parts, of the final olution
Indication of relative concentration
Frequently used in measuring serologic testing
If a serial dilution is prepared in 1:2 dilutions, the final dilution in tube 6 is
1:64
To prepare 10 mL of a diluted serum specimen 1:10, ___ part of serum is needed
1.0
To prepare 10 mL of a diluted serum specimen 1:10, ___ part(s) of a distilled water are needed to reach the total volume
9
Serum for detection of antibodies should be drawn during the
acute and convalescent phases of illnesses
A central concept of serologic testing is
manifestation of a rise in antibody titer
A major advantage of rapid POCT testing is
Faster turnaround time
Rapid testing assays are usually in the ___ CLIA category
waived
Over-the-counter test kits are in the ___ CLIA category
Waived
Rapid turnaround time ____ an important characteristic of POCT
is
Ease of performance ___ an important characteristic of POCT
is
Storage temperature of reagent __ an important characteristic of POCT
is
Length of time until reagent expiration ___ an important characteristic of POCT
is
