, COMPLETE TEST BANK - Tietz Textbook of Clinical Chemistry and
Molecular Diagnostics, 6th Edition Chapters 1–9
CHAPTER 1 — INTRODUCTION TO CLINICAL CHEMISTRY
1. What is a primary purpose of clinical laboratory testing?
A. Replace clinical judgment
B. Provide objective data for patient care
C. Eliminate physical examinations
D. Guarantee a diagnosis
Answer: B
Rationale: Laboratory results support screening, diagnosis, monitoring,
and prognosis.
2. Which phase includes patient preparation and specimen collection?
A. Analytical
B. Postanalytical
C. Preanalytical
D. Interpretive
Answer: C
Rationale: Patient preparation, identification, collection, and transport
are preanalytical processes.
3. Which phase involves measuring an analyte?
A. Preanalytical
B. Analytical
C. Postanalytical
D. Clinical
,Answer: B
Rationale: The analytical phase is the actual measurement process.
4. Reporting a verified laboratory result occurs primarily during the:
A. Preanalytical phase
B. Analytical phase
C. Postanalytical phase
D. Collection phase
Answer: C
Rationale: Result verification, reporting, and communication occur
after analysis.
5. Which factor may affect laboratory results?
A. Age
B. Sex
C. Diet
D. All of the above
Answer: D
Rationale: Physiologic and lifestyle factors can influence analyte
concentrations.
6. A reference interval is generally established from:
A. All hospitalized patients
B. A defined reference population
C. Only critically ill patients
D. Random laboratory results
Answer: B
Rationale: Reference intervals are derived from selected reference
individuals.
7. A value outside a reference interval:
, A. Always confirms disease
B. Always indicates an emergency
C. May require clinical interpretation
D. Is always a laboratory error
Answer: C
Rationale: Abnormal values must be interpreted in clinical context.
8. A critical value is one that:
A. Is slightly abnormal
B. May indicate an immediately dangerous condition
C. Is always inaccurate
D. Requires no follow-up
Answer: B
Rationale: Critical results require prompt communication according to
laboratory policy.
9. Which is a preanalytical error?
A. Incorrect calibration
B. Hemolyzed specimen from poor collection
C. Instrument malfunction during testing
D. Incorrect result calculation by analyzer
Answer: B
Rationale: Collection-related hemolysis occurs before analysis.
10. Clinical laboratory results should be interpreted with:
A. Patient history
B. Physical findings
C. Other diagnostic information
D. All of the above
Molecular Diagnostics, 6th Edition Chapters 1–9
CHAPTER 1 — INTRODUCTION TO CLINICAL CHEMISTRY
1. What is a primary purpose of clinical laboratory testing?
A. Replace clinical judgment
B. Provide objective data for patient care
C. Eliminate physical examinations
D. Guarantee a diagnosis
Answer: B
Rationale: Laboratory results support screening, diagnosis, monitoring,
and prognosis.
2. Which phase includes patient preparation and specimen collection?
A. Analytical
B. Postanalytical
C. Preanalytical
D. Interpretive
Answer: C
Rationale: Patient preparation, identification, collection, and transport
are preanalytical processes.
3. Which phase involves measuring an analyte?
A. Preanalytical
B. Analytical
C. Postanalytical
D. Clinical
,Answer: B
Rationale: The analytical phase is the actual measurement process.
4. Reporting a verified laboratory result occurs primarily during the:
A. Preanalytical phase
B. Analytical phase
C. Postanalytical phase
D. Collection phase
Answer: C
Rationale: Result verification, reporting, and communication occur
after analysis.
5. Which factor may affect laboratory results?
A. Age
B. Sex
C. Diet
D. All of the above
Answer: D
Rationale: Physiologic and lifestyle factors can influence analyte
concentrations.
6. A reference interval is generally established from:
A. All hospitalized patients
B. A defined reference population
C. Only critically ill patients
D. Random laboratory results
Answer: B
Rationale: Reference intervals are derived from selected reference
individuals.
7. A value outside a reference interval:
, A. Always confirms disease
B. Always indicates an emergency
C. May require clinical interpretation
D. Is always a laboratory error
Answer: C
Rationale: Abnormal values must be interpreted in clinical context.
8. A critical value is one that:
A. Is slightly abnormal
B. May indicate an immediately dangerous condition
C. Is always inaccurate
D. Requires no follow-up
Answer: B
Rationale: Critical results require prompt communication according to
laboratory policy.
9. Which is a preanalytical error?
A. Incorrect calibration
B. Hemolyzed specimen from poor collection
C. Instrument malfunction during testing
D. Incorrect result calculation by analyzer
Answer: B
Rationale: Collection-related hemolysis occurs before analysis.
10. Clinical laboratory results should be interpreted with:
A. Patient history
B. Physical findings
C. Other diagnostic information
D. All of the above
