Iowa Admin. Code r. 641-12.7 - Analytical quality control
The number and position of control specimens tested within a batch and the number of calibrators used for each batch of specimens shall be consistent with generally accepted laboratory practice for the methodology used to conduct confirmatory testing.
(1)
Positive and negative controls shall be used in testing each batch of
specimens.
(2) Procedures shall be
implemented and documented to ensure that carryover from a positive specimen
does not contaminate other subsequent specimens in that batch.
(3) Approved laboratories shall develop
criteria for the detection and rejection of adulterated samples.
Notes
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