Confirmatory Validity Test

Last Updated: August 7, 2018

Definition - What does Confirmatory Validity Test mean?

A confirmatory validity test is used to affirm the findings of a specimen validity test. A specimen validity test (SVT) is used to determine if a proffered urine specimen has been adulterated or otherwise tampered with prior to submission. If an initial validity test indicates that the specimen is suspect, the confirmatory validity test is performed using a second sample from the same specimen. This may also be referred to as a specimen confirmation test, specimen confirmatory testing, or a specimen validity test.

WorkplaceTesting explains Confirmatory Validity Test

A confirmatory validity test is a follow-up test conducted subsequent to a specimen validity test. Laboratories engaged in the evaluation of urine samples for Department of Transportation drug testing must conduct a validity test on every specimen. A validity test is used to determine if the specimen submitted is characteristic of normal human urine. This validity test will evaluate whether a specimen has been substituted, adulterated or diluted. If the specimen validity test indicates that the specimen is invalid, then a second portion, or aliquot, is taken from the same specimen and used for the confirmatory validity test to verify the result.

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