NEWEST Medical Laboratory Technician
(MLT) certification, offered by the
American Society for Clinical Pathology
(ASCP) Board of Certification (BOC) |
ULTIMATE EXAM WITH CORRECT
ANSWERS AND RATIONALES FOR
CERTIFICATION SUCCESS
1. The component that isolates specific wavelengths
in a spectrophotometer is called the:
A) Photodetector
B) Monochromator
C) Cuvette
D) Diffraction plate
Correct answer: B
Rationale: The monochromator (either a prism or
diffraction grating) separates white light into specific
wavelengths, allowing selection of the optimal
wavelength for analysis .
,2. A sudden change of quality control values from one
level to another, often caused by failure to recalibrate
when changing reagent lots, is known as:
A) Trend
B) Shift
C) Outlier
D) Random error
Correct answer: B
Rationale: A shift is a sudden, sustained change in
control values, typically moving either all higher or all
lower. It often indicates a change in calibration or
reagent lots .
3. A continuous movement of quality control values in
one direction over six or more analytical runs is
known as:
A) Shift
B) Outlier
C) Trend
D) Random error
Correct answer: C
Rationale: A trend shows a gradual, systematic
change in control values over time, moving
,progressively higher or lower. It may indicate reagent
deterioration or instrument drift .
4. The quality control rule violated when one control
measurement exceeds ±3 standard deviations from
the mean is called the:
A) 13s rule
B) 22s rule
C) R4s rule
D) 41s rule
Correct answer: A
Rationale: The 13s rule is part of Westgard quality
control rules. It indicates rejection of an analytical
run when one control measurement exceeds ±3 SD,
detecting random error .
5. How close a measured value is to the true value is
defined as:
A) Accuracy
B) Precision
C) Linearity
D) Sensitivity
Correct answer: A
, Rationale: Accuracy refers to the closeness of a
measured result to the true or accepted value. It is a
measure of systematic error .
6. The measure of how close a series of
measurements are to one another is defined as:
A) Accuracy
B) Precision
C) Linearity
D) Sensitivity
Correct answer: B
Rationale: Precision refers to the reproducibility or
repeatability of measurements. It is a measure of
random error .
7. The coefficient of variation (CV) is calculated as:
A) Mean divided by standard deviation
B) Standard deviation divided by the mean
C) Variance divided by the mean
D) Standard deviation multiplied by the mean
Correct answer: B
Rationale: The coefficient of variation is calculated as
(Standard Deviation / Mean) x 100% .
(MLT) certification, offered by the
American Society for Clinical Pathology
(ASCP) Board of Certification (BOC) |
ULTIMATE EXAM WITH CORRECT
ANSWERS AND RATIONALES FOR
CERTIFICATION SUCCESS
1. The component that isolates specific wavelengths
in a spectrophotometer is called the:
A) Photodetector
B) Monochromator
C) Cuvette
D) Diffraction plate
Correct answer: B
Rationale: The monochromator (either a prism or
diffraction grating) separates white light into specific
wavelengths, allowing selection of the optimal
wavelength for analysis .
,2. A sudden change of quality control values from one
level to another, often caused by failure to recalibrate
when changing reagent lots, is known as:
A) Trend
B) Shift
C) Outlier
D) Random error
Correct answer: B
Rationale: A shift is a sudden, sustained change in
control values, typically moving either all higher or all
lower. It often indicates a change in calibration or
reagent lots .
3. A continuous movement of quality control values in
one direction over six or more analytical runs is
known as:
A) Shift
B) Outlier
C) Trend
D) Random error
Correct answer: C
Rationale: A trend shows a gradual, systematic
change in control values over time, moving
,progressively higher or lower. It may indicate reagent
deterioration or instrument drift .
4. The quality control rule violated when one control
measurement exceeds ±3 standard deviations from
the mean is called the:
A) 13s rule
B) 22s rule
C) R4s rule
D) 41s rule
Correct answer: A
Rationale: The 13s rule is part of Westgard quality
control rules. It indicates rejection of an analytical
run when one control measurement exceeds ±3 SD,
detecting random error .
5. How close a measured value is to the true value is
defined as:
A) Accuracy
B) Precision
C) Linearity
D) Sensitivity
Correct answer: A
, Rationale: Accuracy refers to the closeness of a
measured result to the true or accepted value. It is a
measure of systematic error .
6. The measure of how close a series of
measurements are to one another is defined as:
A) Accuracy
B) Precision
C) Linearity
D) Sensitivity
Correct answer: B
Rationale: Precision refers to the reproducibility or
repeatability of measurements. It is a measure of
random error .
7. The coefficient of variation (CV) is calculated as:
A) Mean divided by standard deviation
B) Standard deviation divided by the mean
C) Variance divided by the mean
D) Standard deviation multiplied by the mean
Correct answer: B
Rationale: The coefficient of variation is calculated as
(Standard Deviation / Mean) x 100% .
