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MLS 462 Unit 1 Quiz S25 Flashcards | StudBud
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MLS 462 Unit 1 Quiz S25
MLS 462 Unit 1 Quiz S25
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1
Which of the following is NOT a component of a quality management system?
developing quality controls
monitoring mechanisms
increasing test result turnaround time
implementing standardized procedures
2
What is the most sensitive technique?
absorbance
nephelometry
turbidimetry
fluorescence
3
What is the purpose of blanking in endpoint reactions?
speed up the reaction by removing excess reagent
subtract background noise/ensure absorbance is only attributed to analyte
ensure the reaction continues until all analyte is consumed
to increase absorbance of the analyte
4
What type of laboratory test has negligible risk of harm to the patient if performed incorrectly?
high complexity
waived
moderate complexity
EUA
5
Which urine sample is 2-6 hours of output that are collected to give a representative sample?
timed sample
24-hour sample
first morning sample
random sample
6
What does a 1:4 dilution mean in clinical chemistry?
1 part sample/5 parts total solution
4 parts sample/1 part diluent
1 part sample/4 parts diluent
1 part sample/4 parts total solution
7
What is the first troubleshooting step when the QC is out?
recalibrate the assay
order a new instrument
run the control again
get new reagents
8
The purpose of this QSE is to agree with suppliers for products and services.
purchasing and inventory
process management
continual improvement
facilities and safety
9
How many parts of diluent are in a 1-to-4 dilution?
6
4
3
5
10
The Friedewald formula is not accurate if the triglyceride concentration is > 400 mg/dL.
False
True
11
A lower coefficient of variation (CV) means:
higher accuracy
lower accuracy
lower precision
higher precision
12
Which of these reactions are only measured at one point of the reaction?
rate reaction
oxidase reaction
double displacement reaction
endpoint reaction
13
Which measurement technique would best measure [Na
+
]?
transmittance
ion-selective electrode (ISE)
fluoresence
UV-Vis
14
Which is NOT a random error?
evaporation of reagent
incorrect sample volume
air bubble
voltage fluctuations
15
A 1
3s
violation is due to:
pre-analytical error
systematic error
post-analytical error
random error
16
What are the most common interfering substances in serum?
icteric, IV fluids, biotin supplements
lipemia, icteric, hemolysis
lipemia, IV fluids, biotin supplements
lipemia, icteric, protein
17
What is the reference range for anion gap? (mmol/L)
10-20
20-30
15-25
25-35
18
What is the difference between a T-test and an F-test?
both tests compare variances
both tests compare means
T-test compares variances, F-test compares means
T-test compares means, F-test compares variances
19
Which term best describes the degree to which a measurement conforms to the true value?
precision
accuracy
control
reliability
20
Osmolality ___ with dehydration and ___ with overhydration.
decreases, increases
increases, decreases
decreases, decreases
increases, increases
21
If all light is transmitted through a solution, what is the % transmittance?
25
50
100
0
22
What are measurements developed by each laboratory to determine if the QSEs are being met?
quality indicators
management indicators
laboratory regulators
quality system essentials
23
What QC violation (if any) is present in this LJ chart?
no violation
22s
41s
R4s
24
What is the reference range for the osmolal gap? (mOsm/kg H
2
O)
10-20
none of these
5-10
0-10
25
What r value indicates a perfect positive relationship between two methods?
2.0
-1.0
0
1.0
26
What is the median of the following data: 10, 15, 8, 20, 1
8
15
10
10.8
27
Method validation is a one time process to determine performance characteristics of a test prior to patient testing.
True
False
28
Enzymes are consumed during a reaction.
False
True
29
What electrolyte do some hospitals/labs drop when calculating the anion gap?
K+
HCO3-
Cl-
Na+
30
Which tube inhibits the formation of thrombin?
light blue
gray
purple
green
31
The diluted sample result must be multiplied by the ___ to determine the concentration in the undiluted sample.
sample volume
original result
total volume
dilution factor
32
What is the primary objective of method evaluation in clinical chemistry?
ensure the reliability, accuracy, and precision of a method before use
increase the number of tests conducted per day
to reduce the amount of training needed for laboratory staff
assess the cost-effectiveness of lab equipment
33
What is the difference between a patient's laboratory result and their previous result which exceeds a predefined limit?
delta check
reportable range
reference range
post-analystical error
34
What term is defined as the number of individuals who do not have a disease, but test positive?
false positive
true negative
true positive
false negative
35
What is the percentage of values that are within ± 1 SD of the mean in a Gaussian distribution?
75%
68%
65%
80%
36
What chemistry panel contains albumin, total protein, ALP, AST, ALT, and total and direct bilirubin?
lipid profile
hepatic panel
electrolyte panel
basic metabolic panel
