1
CPL250 BEAKER CLINICAL PATHOLOGY
ADMINISTRATION QUIZ 4 2026/2027 | CLINICAL
PATHOLOGY | 50 VERIFIED Q&A | DETAILED
RATIONALES | PASS GUARANTEED – A+ GRADED
SECTION I: LABORATORY QUALITY MANAGEMENT – Questions 1-10
Q1: Quality Control – Random Error
The student is reviewing quality control. Which Westgard rule detects random error?
A. 1-3s
B. 2-2s
C. 4-1s
D. 10x
Correct Answer: A
Rationale: The 1-3s rule detects random error. It is violated when one control value exceeds the
mean by ±3 standard deviations. The 2-2s, 4-1s, and 10x rules detect systematic error. [100%
CORRECT]
Q2: Quality Control – Systematic Error
The student is reviewing quality control. Which Westgard rule detects systematic error?
A. 1-3s
B. 2-2s
C. R4s
D. 1-2s
Correct Answer: B
Rationale: The 2-2s rule detects systematic error. It is violated when two consecutive control values
exceed the same mean ±2 standard deviations. The 1-3s and R4s rules detect random error. [100%
CORRECT]
Q3: Quality Control – 10x Rule
The student is reviewing Westgard rules. What does the 10x rule detect?
A. Random error
B. Systematic error
C. Both random and systematic error
D. No error
, 2
Correct Answer: B
Rationale: The 10x rule detects systematic error. It is violated when ten consecutive control values
fall on one side of the mean. [100% CORRECT]
Q4: Quality Control – R4s Rule
The student is reviewing Westgard rules. What does the R4s rule detect?
A. Random error
B. Systematic error
C. Both random and systematic error
D. No error
Correct Answer: A
Rationale: The R4s rule detects random error. It is violated when the difference between two
control values within the same run exceeds 4 standard deviations. [100% CORRECT]
Q5: Quality Control – 2of3-2s Rule
The student is reviewing Westgard rules. What does the 2of3-2s rule detect?
A. Random error
B. Systematic error
C. Both random and systematic error
D. No error
Correct Answer: B
Rationale: The 2of3-2s rule detects systematic error. It is violated when two of three consecutive
control values exceed the same mean ±2 standard deviations. [100% CORRECT]
Q6: Quality Control – 7T Rule
The student is reviewing Westgard rules. What does the 7T rule detect?
A. Random error
B. Systematic error
C. Both random and systematic error
D. No error
Correct Answer: B
Rationale: The 7T rule detects systematic error. It is violated when seven consecutive control values
show a trend (steadily increasing or decreasing). [100% CORRECT]
Q7: Quality Control – 7x Rule
The student is reviewing Westgard rules. What does the 7x rule detect?
CPL250 BEAKER CLINICAL PATHOLOGY
ADMINISTRATION QUIZ 4 2026/2027 | CLINICAL
PATHOLOGY | 50 VERIFIED Q&A | DETAILED
RATIONALES | PASS GUARANTEED – A+ GRADED
SECTION I: LABORATORY QUALITY MANAGEMENT – Questions 1-10
Q1: Quality Control – Random Error
The student is reviewing quality control. Which Westgard rule detects random error?
A. 1-3s
B. 2-2s
C. 4-1s
D. 10x
Correct Answer: A
Rationale: The 1-3s rule detects random error. It is violated when one control value exceeds the
mean by ±3 standard deviations. The 2-2s, 4-1s, and 10x rules detect systematic error. [100%
CORRECT]
Q2: Quality Control – Systematic Error
The student is reviewing quality control. Which Westgard rule detects systematic error?
A. 1-3s
B. 2-2s
C. R4s
D. 1-2s
Correct Answer: B
Rationale: The 2-2s rule detects systematic error. It is violated when two consecutive control values
exceed the same mean ±2 standard deviations. The 1-3s and R4s rules detect random error. [100%
CORRECT]
Q3: Quality Control – 10x Rule
The student is reviewing Westgard rules. What does the 10x rule detect?
A. Random error
B. Systematic error
C. Both random and systematic error
D. No error
, 2
Correct Answer: B
Rationale: The 10x rule detects systematic error. It is violated when ten consecutive control values
fall on one side of the mean. [100% CORRECT]
Q4: Quality Control – R4s Rule
The student is reviewing Westgard rules. What does the R4s rule detect?
A. Random error
B. Systematic error
C. Both random and systematic error
D. No error
Correct Answer: A
Rationale: The R4s rule detects random error. It is violated when the difference between two
control values within the same run exceeds 4 standard deviations. [100% CORRECT]
Q5: Quality Control – 2of3-2s Rule
The student is reviewing Westgard rules. What does the 2of3-2s rule detect?
A. Random error
B. Systematic error
C. Both random and systematic error
D. No error
Correct Answer: B
Rationale: The 2of3-2s rule detects systematic error. It is violated when two of three consecutive
control values exceed the same mean ±2 standard deviations. [100% CORRECT]
Q6: Quality Control – 7T Rule
The student is reviewing Westgard rules. What does the 7T rule detect?
A. Random error
B. Systematic error
C. Both random and systematic error
D. No error
Correct Answer: B
Rationale: The 7T rule detects systematic error. It is violated when seven consecutive control values
show a trend (steadily increasing or decreasing). [100% CORRECT]
Q7: Quality Control – 7x Rule
The student is reviewing Westgard rules. What does the 7x rule detect?
