CPC Drug Testing Protocols & Compliance Standards 4

Question 1

Under DOT rules, which situation requires a directly observed collection?

Accepted Answer

The lab reports the specimen as invalid for the second time

Answer

A second invalid result on a recollection triggers a directly observed collection requirement under 49 CFR Part 40.

Question 2

What is the cutoff concentration for an initial immunoassay screen for marijuana metabolites (THC-COOH) in federal urine testing?

Accepted Answer

50 ng/mL

Answer

The federal initial test cutoff for THC-COOH is 50 ng/mL; confirmed positive requires GC-MS at 15 ng/mL.

Question 3

Which confirmatory method is required to confirm an initial positive screening result in federal workplace testing?

Accepted Answer

Gas chromatography/mass spectrometry (GC-MS)

Answer

GC-MS is the required confirmatory technique for federal workplace drug tests due to its high specificity and sensitivity.

Question 4

An employee subject to DOT testing tests positive for cocaine. The MRO interviews the employee, who claims passive exposure. The MRO should:

Accepted Answer

Verify the result as positive regardless of the claim

Answer

Passive inhalation is not a legitimate medical explanation that allows an MRO to alter a positive result; the MRO must verify it as positive.

Question 5

How long must a certified laboratory retain a confirmed positive urine specimen?

Accepted Answer

1 year

Answer

Confirmed positive specimens must be retained by the laboratory for a minimum of 1 year under SAMHSA guidelines.

(CPC) Certified Professional Collector Practice Test