Iowa Admin. Code r. 641-12.7 - [Effective 7/1/2025] Sample security and confidentiality of test results
Samples and reports must never be left unattended or unsecured.
(1) Complete chain of
custody documentation shall be maintained for each sample from the time of
collection from the employee or prospective employee to the time the sample is
discarded. Each time the sample is handled or transferred, the individual
receiving the sample, the time and date of transfer, and the recipient or
destination of the sample shall be documented.
(2) If the first portion of the sample
yielded a confirmed positive test result, the laboratory shall store the second
portion of that sample until receipt of a confirmed negative test result or for
a period of at least 45 calendar days following the completion of the initial
confirmatory testing. Urine and blood samples shall be retained in secure
storage at freezing temperatures.
(3) All samples for which a negative test
result was reported shall be disposed of within five working days after
issuance of the negative test result report.
Notes
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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
(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.