CPC CPC Adulteration & Specimen Validity Testing 2

Question 1

What specific gravity range indicates a substituted specimen under federal drug testing guidelines?

Accepted Answer

Less than 1.001 or greater than 1.020

Answer

Less than 1.003 or greater than 1.030

Answer

Less than 1.010 or greater than 1.025

Answer

Less than 1.005 or greater than 1.015

Question 2

A donor's specimen is reported as 'dilute.' What does this finding indicate?

Accepted Answer

The specimen has creatinine between 2–20 mg/dL and specific gravity between 1.001–1.003

Answer

The specimen contains a foreign chemical that interferes with drug testing

Answer

The specimen was left unrefrigerated and degraded before reaching the laboratory

Answer

The specimen volume was insufficient for testing

Question 3

Under DOT regulations, what action is typically required when a pre-employment test result is reported as dilute negative?

Accepted Answer

The employer may, but is not required to, conduct a recollection under direct observation

Answer

The employer must automatically order a second collection under direct observation

Answer

The result is treated as a negative and no further action is needed

Answer

The MRO must request a split specimen retest

Question 4

What laboratory finding would classify a specimen as 'invalid' under federal validity criteria?

Accepted Answer

Presence of an unidentified interfering substance or results that are outside expected physiological ranges

Answer

A pH reading between 4.5 and 8.5 with no other abnormal indicators

Answer

A specimen temperature that was within the acceptable range at collection

Answer

A creatinine level between 20 and 300 mg/dL

Question 5

When a specimen is reported as 'invalid,' what is the MRO's required next step?

Accepted Answer

Contact the donor to determine if there is a legitimate medical explanation, then order a recollection if no explanation is provided

Answer

Report the result as a refusal to test without contacting the donor

Answer

Automatically cancel the test and require a new collection

Answer

Forward the case directly to the employer for disciplinary action

Question 6

Which of the following is NOT a specimen validity test parameter measured by the laboratory?

Accepted Answer

The donor's blood alcohol concentration (BAC)

Answer

Creatinine concentration

Answer

Specific gravity

Answer

Oxidant or oxidizing adulterant presence