ItalianoInternal Quality Controlis based on verifying two properties of the analytical data:
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PRECISION and ACCURACY .
PRECISION implies REPEATABILITY > test.
A dosage is classified PRECISE (therefore REPEAT ) when, performing it multiple times on the same sample, both in a daily series and among subsequent series, you get a result pool with variable variability , ie falling in precise statistical limits ( Standard Media and Deviation ). The entire population of data, merged into frequency classes, will describe a Gauss representative of the phenomenon ( Internal Quality Control or Intra-Laboratory Control)
Accuracy implies theRIPRODUCIBILITY of the test
A dosage is classified ACCURATO (ieREPRODUCIBLE)when examining a sample already tested at other laboratories (of which, it is know, the consensus value or the value considered true ), the recorded difference has little statistical significance (Control or External Evaluation Quality-VEQ)
PRECISION must be checked daily, ACCURACY b> can be ascertained at a wider interval. Recognizing this without being sure to operate at an acceptable level of PRECISION is useless and damaging.