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CLT Clinical Laboratory Technician Exam 1 |
Verified Q&A with Rationales | Multiple
Choice, Fill-in-the-Blank & Direct Answers
Exam Structure:
Subject: CLT (Clinical Laboratory Technician) Exam Preparation
Source: CLT Exam 1 Questions and Correct Answers
Format: Multiple Choice, Fill-in-the-Blank, and Direct Answer with Rationales
1. Which of the following declarations is real?
A) Only one level of control must be proven daily
B) At minimum two levels of control must be proven daily for each practice
session engaged
C) Controls are only required weekly
D) No controls are needed for routine sessions
Correct Answer: B) At minimum two levels of control must be proven
daily for each practice session engaged
Rationale:
1. Clinical laboratory regulations require daily quality control testing at
two concentration levels (low and high) for each test procedure.
2. This ensures accuracy across the entire reportable range of the assay.
3. Two levels detect both systematic and random errors more effectively
than a single level.
2. When evaluating an instrument to its peer group, which statistic
specifies the most valuable information regarding its ACCURACY?
A) Standard deviation
B) Coefficient of variation
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C) SDI - Standard Deviation Index
D) Mean
Correct Answer: C) SDI - Standard Deviation Index
Rationale:
1. SDI (Standard Deviation Index) measures how far an instrument’s
mean is from the peer group mean in units of standard deviation.
2. It directly indicates accuracy by showing systematic bias relative to
peers.
3. An SDI near 0 indicates good accuracy; SDI beyond ±2.0 suggests
significant bias.
3. When evaluating an instrument to its peer group, which statistic
supplies the most valuable information regarding OVERALL
IMPRECISION?
A) SDI
B) CVR
C) Mean
D) Range
Correct Answer: B) CVR
Rationale:
1. CVR (Coefficient of Variation Ratio) compares the instrument’s
imprecision to peer group imprecision.
2. It reflects overall random error or precision performance.
3. Higher CVR values indicate greater imprecision relative to peers.
4. 2(2s) rule detects what type of error?
A) Random error
B) Systematic error
C) Proportional error
D) Constant error
Correct Answer: B) Systematic error
Rationale:
1. The 2(2s) Westgard rule is violated when two consecutive control
measurements exceed the same 2s limit.
2. This pattern indicates systematic error (bias shift) rather than random
error.
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3. It triggers rejection of the run and investigation of calibration or
reagent issues.
5. 1(3s) rule detects what type of error?
A) Systematic error
B) Random error
C) Constant error
D) Calibration error
Correct Answer: B) Random error
Rationale:
1. The 1(3s) rule is violated when a single control measurement exceeds
the 3s limit.
2. This indicates a random error (outlier) rather than a systematic shift.
3. Possible causes include pipetting error, bubble, or transient electrical
noise.
6. If the light source on an instrument is gradually dwindling, it could
cause what type of error?
A) Random error
B) Systematic error
C) Gross error
D) No error
Correct Answer: B) Systematic error
Rationale:
1. A gradually decreasing light source causes a consistent drift in
absorbance readings.
2. This drift affects all samples proportionally, producing systematic error.
3. It is predictable and unidirectional (e.g., all results trending higher or
lower over time).
7. If you change the acid-base indicator on the agent and your control
results demonstrate a sudden and consistent increase in value, this
phenomenon is:
A) Random error
B) A shift in accuracy due to systematic error
C) Gross negligence
D) Normal variation
CLT Clinical Laboratory Technician Exam 1 |
Verified Q&A with Rationales | Multiple
Choice, Fill-in-the-Blank & Direct Answers
Exam Structure:
Subject: CLT (Clinical Laboratory Technician) Exam Preparation
Source: CLT Exam 1 Questions and Correct Answers
Format: Multiple Choice, Fill-in-the-Blank, and Direct Answer with Rationales
1. Which of the following declarations is real?
A) Only one level of control must be proven daily
B) At minimum two levels of control must be proven daily for each practice
session engaged
C) Controls are only required weekly
D) No controls are needed for routine sessions
Correct Answer: B) At minimum two levels of control must be proven
daily for each practice session engaged
Rationale:
1. Clinical laboratory regulations require daily quality control testing at
two concentration levels (low and high) for each test procedure.
2. This ensures accuracy across the entire reportable range of the assay.
3. Two levels detect both systematic and random errors more effectively
than a single level.
2. When evaluating an instrument to its peer group, which statistic
specifies the most valuable information regarding its ACCURACY?
A) Standard deviation
B) Coefficient of variation
, 2|Page
C) SDI - Standard Deviation Index
D) Mean
Correct Answer: C) SDI - Standard Deviation Index
Rationale:
1. SDI (Standard Deviation Index) measures how far an instrument’s
mean is from the peer group mean in units of standard deviation.
2. It directly indicates accuracy by showing systematic bias relative to
peers.
3. An SDI near 0 indicates good accuracy; SDI beyond ±2.0 suggests
significant bias.
3. When evaluating an instrument to its peer group, which statistic
supplies the most valuable information regarding OVERALL
IMPRECISION?
A) SDI
B) CVR
C) Mean
D) Range
Correct Answer: B) CVR
Rationale:
1. CVR (Coefficient of Variation Ratio) compares the instrument’s
imprecision to peer group imprecision.
2. It reflects overall random error or precision performance.
3. Higher CVR values indicate greater imprecision relative to peers.
4. 2(2s) rule detects what type of error?
A) Random error
B) Systematic error
C) Proportional error
D) Constant error
Correct Answer: B) Systematic error
Rationale:
1. The 2(2s) Westgard rule is violated when two consecutive control
measurements exceed the same 2s limit.
2. This pattern indicates systematic error (bias shift) rather than random
error.
, 3|Page
3. It triggers rejection of the run and investigation of calibration or
reagent issues.
5. 1(3s) rule detects what type of error?
A) Systematic error
B) Random error
C) Constant error
D) Calibration error
Correct Answer: B) Random error
Rationale:
1. The 1(3s) rule is violated when a single control measurement exceeds
the 3s limit.
2. This indicates a random error (outlier) rather than a systematic shift.
3. Possible causes include pipetting error, bubble, or transient electrical
noise.
6. If the light source on an instrument is gradually dwindling, it could
cause what type of error?
A) Random error
B) Systematic error
C) Gross error
D) No error
Correct Answer: B) Systematic error
Rationale:
1. A gradually decreasing light source causes a consistent drift in
absorbance readings.
2. This drift affects all samples proportionally, producing systematic error.
3. It is predictable and unidirectional (e.g., all results trending higher or
lower over time).
7. If you change the acid-base indicator on the agent and your control
results demonstrate a sudden and consistent increase in value, this
phenomenon is:
A) Random error
B) A shift in accuracy due to systematic error
C) Gross negligence
D) Normal variation
