QA

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Across
  1. 1. Graphical tool in external QC to detect systematic differences between labs
  2. 4. Peer comparison index calculated as (lab mean – group mean)/group SD
  3. 5. Definitive method against which new tests are compared
  4. 7. Relative measure of precision expressed as a percentage of the mean
  5. 10. Interference caused by components of the specimen other than analyte
  6. 11. Mistakes occurring after testing, such as reporting or data transcription
  7. 14. Clinical measure influenced by disease prevalence, sensitivity, and specificity
  8. 16. Graph used to visualize control values over time
  9. 17. Multirule system used to detect both random and systematic QC errors
  10. 18. Patient safety QC comparing current and previous results for consistency
  11. 19. Error type that shifts results consistently away from the true value
Down
  1. 2. Combination of systematic and random errors relative to true value
  2. 3. Error type causing imprecision but not bias in results
  3. 4. Abrupt change of QC values to a new mean, commonly due to calibration error
  4. 6. Property of control material to behave like patient samples in assays
  5. 8. External quality assessment used to evaluate laboratory accuracy
  6. 9. Persistent deviation of test results from the reference value
  7. 12. Range of values established from a healthy population
  8. 13. Gradual shift of QC results in one direction over time, often indicating deterioration of reagents
  9. 15. Westgard rule triggered when one control is +2SD and the other is –2SD