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CPC Adulteration & Specimen Validity Testing Flashcards

6 cards from real CPC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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

    Answer: Less than 1.001 or greater than 1.020

    Specific gravity outside 1.001–1.020, combined with creatinine below 2 mg/dL, meets the federal criteria for a substituted specimen.

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

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

    A dilute specimen has low but not absent creatinine (2–20 mg/dL) and specific gravity (1.001–1.003), suggesting either natural over-hydration or intentional dilution.

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

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

    For a dilute negative pre-employment result, the employer has the discretion to require a recollection under direct observation per their written policy, but it is not mandated.

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

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

    An invalid result occurs when the laboratory cannot complete testing due to an interfering substance or results that are inconsistent with normal human physiology.

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

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

    The MRO must attempt to contact the donor for a medical explanation; if none is found, the MRO orders a recollection under direct observation.

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

    Answer: The donor's blood alcohol concentration (BAC)

    Blood alcohol concentration is measured by a separate breath or blood alcohol test; it is not part of urine specimen validity testing.