Iowa Admin. Code r. 641-12.6 - [Effective 7/1/2025] 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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All approved confirmatory laboratories shall have a written quality assurance program and a procedure manual which encompasses all aspects of the
(1) Approved laboratories shall have written procedures for performing alcohol or drug testing which shall include the following:
a. Sample acquisition.
b. Chain of custody.
c. Sample and report security.
d. Test performance.
e. Reporting of results. / Confidentiality.
(2) The quality assurance program and procedure manuals shall be available for review during any on-site inspection .
(3) Approved laboratories shall review their performance in each of the above areas every 12 months.
(4) Approved laboratories are responsible for developing the criteria necessary to establish and maintain an effective quality assurance program for confirmatory testing of alcohol or other drugs, or their metabolites.