CPC CPC Adulteration & Specimen Validity Testing 3

Question 1

What is the acceptable pH range for a valid urine specimen in federal drug testing?

Accepted Answer

4.0 to 11.0

Answer

Under 49 CFR Part 40, a urine specimen with a pH outside the range of 4.0 to 11.0 is reported as invalid due to incompatibility with normal human physiology.

Question 2

Why do some individuals attempt to add nitrites to a urine specimen before collection?

Accepted Answer

Nitrites can destroy drug metabolites such as THC-COOH, potentially producing a false negative result

Answer

Nitrites are an adulterant that can oxidize and destroy certain drug metabolites, particularly THC-COOH, to produce a falsely negative drug test result.

Question 3

How does a laboratory detect the presence of glutaraldehyde in a urine specimen?

Accepted Answer

Through specific chemical validity tests that identify this adulterant by its reactivity or immunoassay interference

Answer

Laboratories use specific chemical assays designed to detect glutaraldehyde and other commercial adulterant products, as standard drug tests alone cannot identify them.

Question 4

If a collector observes a donor attempt to pour a substance into the specimen cup, what must the collector do?

Accepted Answer

Immediately stop the collection, document the observation on the CCF, and notify the DER

Answer

Observed adulteration attempts must be documented immediately, the collection stopped, and the DER notified so that appropriate action, including a direct observation recollection, can be arranged.

Question 5

What is the consequence for a donor if their specimen is confirmed as adulterated under DOT regulations?

Accepted Answer

The result is reported to the MRO and employer as a refusal to test, with the same consequences as a positive result

Answer

An adulterated specimen confirmed by the laboratory is reported by the MRO as a refusal to test, which carries the same regulatory consequences as a verified positive result.

(CPC) Certified Professional Collector Practice Test

(CPC) Certified Professional Collector Practice Test

CPC CPC Adulteration & Specimen Validity Testing 3