AAB MT General Knowledge General Operations EXAM
TEST WITH LATEST UPDATED (QUESTIONS AND
ANSWERS) 2026-2027
1. Under CLIA regulations, what is the required frequency for verifying
the accuracy of laboratory tests classified as "High Complexity"?
ANSWERS> Every six months. (Also, two levels of control must be run
each day of patient testing).
2. What is the primary purpose of a "Delta Check" in the laboratory
information system (LIS)?
ANSWERS> To compare a patient's current test result with their
previous result for the same analyte to detect gross errors, specimen
mix-ups, or significant physiological changes.
3. Which Westgard rule indicates random error and typically requires
rejection of the entire analytical run?
ANSWERS> The 1-3s rule (one control observation exceeds the mean ±
3 standard deviations).
4. In a normal Gaussian (bell-shaped) distribution curve, what
percentage of data falls within ± 2 Standard Deviations (SD) of the
mean?
ANSWERS> 95.5% (or approximately 95%).
, 5. What is the formula for calculating the Coefficient of Variation (CV)?
ANSWERS> CV = (Standard Deviation / Mean) × 100.
6. What is the difference between "Accuracy" and "Precision" in
laboratory testing?
ANSWERS> Accuracy refers to how close a measured value is to the true
value (trueness). Precision refers to the reproducibility of repeated
measurements (how close the measurements are to each other).
7. According to OSHA's Bloodborne Pathogens Standard, what is the
primary engineering control used to prevent needlestick injuries during
blood collection?
ANSWERS> Safety-engineered needles (e.g., retractable needles or
needle guards) and the immediate disposal of needles into puncture-
resistant sharps containers without recapping.
8. What is the proper order of the blood culture bottle draw when
collecting a blood culture using a winged collection set?
ANSWERS> The aerobic bottle first, followed by the anaerobic bottle.
(Because air in the tubing of the butterfly set can falsely introduce air
into the anaerobic bottle if drawn first).
TEST WITH LATEST UPDATED (QUESTIONS AND
ANSWERS) 2026-2027
1. Under CLIA regulations, what is the required frequency for verifying
the accuracy of laboratory tests classified as "High Complexity"?
ANSWERS> Every six months. (Also, two levels of control must be run
each day of patient testing).
2. What is the primary purpose of a "Delta Check" in the laboratory
information system (LIS)?
ANSWERS> To compare a patient's current test result with their
previous result for the same analyte to detect gross errors, specimen
mix-ups, or significant physiological changes.
3. Which Westgard rule indicates random error and typically requires
rejection of the entire analytical run?
ANSWERS> The 1-3s rule (one control observation exceeds the mean ±
3 standard deviations).
4. In a normal Gaussian (bell-shaped) distribution curve, what
percentage of data falls within ± 2 Standard Deviations (SD) of the
mean?
ANSWERS> 95.5% (or approximately 95%).
, 5. What is the formula for calculating the Coefficient of Variation (CV)?
ANSWERS> CV = (Standard Deviation / Mean) × 100.
6. What is the difference between "Accuracy" and "Precision" in
laboratory testing?
ANSWERS> Accuracy refers to how close a measured value is to the true
value (trueness). Precision refers to the reproducibility of repeated
measurements (how close the measurements are to each other).
7. According to OSHA's Bloodborne Pathogens Standard, what is the
primary engineering control used to prevent needlestick injuries during
blood collection?
ANSWERS> Safety-engineered needles (e.g., retractable needles or
needle guards) and the immediate disposal of needles into puncture-
resistant sharps containers without recapping.
8. What is the proper order of the blood culture bottle draw when
collecting a blood culture using a winged collection set?
ANSWERS> The aerobic bottle first, followed by the anaerobic bottle.
(Because air in the tubing of the butterfly set can falsely introduce air
into the anaerobic bottle if drawn first).
