# Internal quality control

INTERNAL Quality Control is based on verifying two properties of the analytical data:

PRECISION AND ACCURACY.

PRECISION implies the REPEATABILITY of the test.

A dosage is classified PRECISE (therefore REPEATABLE) when, performing it several times on the same sample, both in daily and subsequent series, a pool of results with variable variability is obtained, ie within a precise statistical boundary (Media and Standard Deviation ). The entire data population, aggregated into frequency classes, will describe a Gauss curve  representative of the phenomenon (Internal Quality Control or Intra-Laboratory Control)

ACCURACY implies the REPRODUCIBILITY of the test

A dosage is classified ACCURATE (therefore REPRODUCTIVE) when, examining a sample already tested at other laboratories (ie, known as the consensus value or the value considered true), the recorded difference has little statistical significance (Control or External Evaluation of Quality-EQA)

PRECISION must be checked daily, ACCURACY can be ascertained at a wider interval. Recognizing this without having the certainty of operating at an acceptable level of PRECISION is useless and damaging.

Our solution: QCP 2000.