Set 27 LAB DHA MCQ — Pre-Analytical Errors
Medium-difficulty multiple-choice quiz focused on pre-analytical laboratory errors and prevention based on Set 27 material.
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Quiz Questions & Answers
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Question 1: Which phase of laboratory testing is responsible for the largest proportion of total lab errors?
Pre-analytical phase
Post-analytical phase
Quality control phase
Analytical phase
Question 2: A patient ate one hour before a fasting lipid test. This error is best classified as:
Instrument calibration error
Post-analytical error
Analytical error
Pre-analytical error
Question 3: Which practice most effectively prevents patient misidentification during sample collection?
Label tubes after leaving bedside
Use at least two patient identifiers
Ask patient room number
Rely on nurse confirmation only
Question 4: A pink or red serum with a potassium of 6.8 mmol/L in an asymptomatic patient most likely indicates:
Instrument malfunction
True hyperkalemia
Hemolyzed sample causing falsely elevated potassium
Renal failure
Question 5: What is the correct blood-to-anticoagulant ratio for blue-top citrate tubes used in coagulation testing?
12:1
5:1
9:1
7:1
Question 6: Which pre-analytical action can introduce EDTA contamination and cause falsely low calcium and high potassium?
Incorrect order of draw transferring EDTA into serum tube
Delaying centrifugation for two hours
Transporting on ice unnecessarily
Using an expired clot activator tube
Question 7: Which sample type must be transported on ice immediately to preserve accurate results?
TSH
Albumin
Cholesterol
Ammonia
Question 8: Which practice most effectively reduces the overall rate of pre-analytical errors in a laboratory?
Increasing machine calibration frequency
Faster reporting times
Staff training and adherence to standardized SOPs
Reducing the number of tests ordered