Certified Phlebotomy Technician (CPT) Quiz: Chain Of Custody
15 questions · exam conditions
0:00
Chain Of CustodyQuestion 1 of 15

During a forensic blood alcohol collection, the phlebotomist notices that the special evidence tube appears to have a small crack in the rubber stopper after the blood is drawn. The specimen volume is adequate and the blood draw was successful. What action best maintains the legal integrity of the specimen?

Transfer the blood to a new evidence tube using sterile technique and document the transfer on the chain of custody form
Reinforce the cracked stopper with laboratory tape and initial the tape to show it was applied post-collection
Discard the specimen and perform a complete re-collection using new equipment and a new chain of custody form
Continue with the current specimen since the crack occurred after collection and the tube integrity was intact during the draw
← Back to quizzes

Certified Phlebotomy Technician (CPT) Quiz

Certified Phlebotomy Technician (CPT) Quiz: Chain Of Custody

Practice Chain Of Custody in Certified Phlebotomy Technician (CPT) with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Chain Of Custody, giving you a quick way to practice the rules, question types, and explanations that matter most for Certified Phlebotomy Technician (CPT).

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

During a forensic blood alcohol collection, the phlebotomist notices that the special evidence tube appears to have a small crack in the rubber stopper after the blood is drawn. The specimen volume is adequate and the blood draw was successful. What action best maintains the legal integrity of the specimen?

  1. Transfer the blood to a new evidence tube using sterile technique and document the transfer on the chain of custody form
  2. Reinforce the cracked stopper with laboratory tape and initial the tape to show it was applied post-collection
  3. Discard the specimen and perform a complete re-collection using new equipment and a new chain of custody form (correct answer)
  4. Continue with the current specimen since the crack occurred after collection and the tube integrity was intact during the draw
Explanation: For forensic specimens, any compromise to container integrity requires complete re-collection to maintain legal defensibility. Choice A involves transfer which breaks chain of custody. Choice B attempts to repair but doesn't address the fundamental integrity compromise. Choice D ignores that post-collection container compromise can still affect legal validity and specimen security.

Question 2

Using isopropyl alcohol to prep the site before a forensic blood alcohol draw would:

  1. Falsely raise ethanol result (correct answer)
  2. Falsely lower ethanol result
  3. Prevent glycolysis in the tube
  4. Void the chain-of-custody form
Explanation: Isopropyl alcohol used to prep the skin can contaminate the blood sample, so the ethanol measurement can come out falsely high. The tempting wrong answer is preventing glycolysis, but that is the job of sodium fluoride in the tube, not isopropanol on the skin.

Question 3

A sealed forensic specimen is handed to the courier. Who signs the custody form next?

  1. The emergency physician
  2. The courier receiving it (correct answer)
  3. The lab accessions clerk
  4. The patient's primary nurse
Explanation: The chain of custody follows the item person by person. When the specimen is handed over, the courier receiving it is the next person in possession, so the courier must sign the custody form to document the transfer. The lab accessions clerk is a tempting answer, but that signature comes later, after the courier delivers the sealed specimen to the lab.

Question 4

Which error most directly breaks the chain of custody for a legal specimen?

  1. Tamper-evident seal is broken (correct answer)
  2. Using an alcohol skin prep
  3. Tourniquet left on too long
  4. Hemolyzed specimen in tube
Explanation: A broken tamper-evident seal means the specimen container could have been opened or switched, so you can no longer prove who handled it or that it stayed intact. That loss of proof directly breaks the chain of custody for a legal specimen. The hemolyzed specimen is tempting, but hemolysis affects test results, not the specimen's custody history.

Question 5

A forensic blood alcohol specimen is placed in a gray-top tube. The fluoride is added to:

  1. Prevent clotting of the sample
  2. Decrease the ethanol result
  3. Stop in vitro ethanol rise (correct answer)
  4. Speed up red cell glycolysis
Explanation: Fluoride inhibits glycolysis, so cells and microorganisms in the blood cannot produce ethanol while the specimen sits in the tube. This keeps the alcohol result accurate. It does not prevent clotting; oxalate in the gray-top tube does that. It also slows, not speeds up, red cell glycolysis, so that tempting choice is wrong.

Question 6

In a witnessed urine drug screen, the specimen temperature is 88°F. The collector should:

  1. Accept if the seal is intact
  2. Record the value and ship it
  3. Have the donor drink water
  4. Reject and collect a new one (correct answer)
Explanation: A fresh urine specimen should measure 90-100 F within a few minutes of collection. 88 F falls below that range, so the specimen is considered invalid even if the seal is intact. The action is to reject it and collect a new specimen. Recording the value and shipping it is tempting but you cannot accept an out-of-range temperature.

Question 7

A courier arrives to transport forensic blood specimens to an external laboratory. The chain of custody form is properly completed, but the courier's identification badge shows an expiration date from last month, although they have a current driver's license with proper photo ID. The specimens have been waiting for pickup for 3 hours. What is the correct action?

  1. Refuse transfer to the courier and contact the courier service to send a representative with current company identification credentials (correct answer)
  2. Accept the current driver's license as sufficient identification since it provides proper photo verification and allow the courier to take custody
  3. Allow the transfer but document the expired badge issue on the chain of custody form and require additional verification signatures
  4. Contact the receiving laboratory to verify the courier's identity and authorization before releasing the specimens for transport
Explanation: Forensic blood specimens require the strictest chain of custody protocols because they may be used as evidence in legal proceedings. Any break in proper procedures could render the evidence inadmissible in court. When handling forensic specimens, you must verify that every person in the custody chain has current, valid authorization from their organization. Answer A is correct because expired company identification means the courier cannot prove current authorization to handle forensic specimens. Even though they've waited 3 hours, maintaining chain of custody integrity takes absolute priority. You must refuse transfer and request a properly credentialed courier from the service. Answer B is wrong because a driver's license only proves identity, not authorization to handle forensic evidence. The courier needs current company credentials proving they're authorized by their organization to transport these specific specimens. Answer C is incorrect because documenting the problem doesn't fix it. An expired badge represents a fundamental break in authorization that cannot be resolved through additional signatures or documentation workarounds. Answer D seems reasonable but is wrong because laboratory verification doesn't replace the requirement for current company identification. The receiving lab cannot authorize someone who lacks proper credentials from their own courier service. Study tip: For chain of custody questions, remember that forensic specimens have zero tolerance for procedural violations. When in doubt, protect the evidence's legal integrity even if it means delays. Current company authorization is always required - personal ID alone is never sufficient for forensic transport.

Question 8

A phlebotomist discovers that a blood specimen collected for legal blood alcohol testing 2 hours ago was not stored in the locked evidence refrigerator as required, but instead was left on the laboratory counter. The specimen tube appears intact and properly labeled. What action best preserves the legal validity of the specimen?

  1. Immediately place the specimen in the locked refrigerator and document the storage delay on the chain of custody form with an explanation
  2. Test the specimen for alcohol content immediately since delayed refrigeration may have affected the preservation of alcohol levels
  3. Discard the specimen and notify the ordering party that a new collection is required due to improper storage protocol
  4. Contact the ordering authority to report the chain of custody breach and follow their instructions regarding specimen validity (correct answer)
Explanation: When you encounter questions about legal specimens and chain of custody issues, remember that forensic specimens follow much stricter protocols than routine laboratory samples because they may be used as evidence in court proceedings. Answer D is correct because any break in the chain of custody for a legal specimen requires immediate notification of the ordering authority (typically law enforcement or legal counsel). They are the only ones with authority to determine whether the specimen remains legally valid or if the breach compromises its admissibility in court. The phlebotomist must report the incident and await instructions rather than making independent decisions about the specimen's fate. Answer A is wrong because simply documenting the error and proceeding with storage doesn't address the fundamental legal issue. While documentation is important, the chain of custody has already been broken, and this cannot be remedied by retroactive proper storage. Answer B is incorrect because testing the specimen without authorization from the ordering authority could further compromise its legal standing. Additionally, the decision about testing timing should be made by those with legal authority, not laboratory personnel. Answer C assumes the specimen must be discarded, but this decision isn't yours to make. The ordering authority might determine the specimen is still legally viable depending on the specific case circumstances and legal requirements. Study tip: For CPT exam questions involving legal or forensic specimens, always remember that phlebotomists must immediately escalate chain of custody issues to the appropriate authority rather than attempting to resolve them independently. Your role is to report, not decide.

Question 9

A phlebotomist is collecting a urine specimen for drug screening from an employee as part of a workplace testing program. The employee provides the specimen and seals it in the collection cup. What is the next critical step to maintain chain of custody integrity?

  1. Label the specimen container with the patient's name and date of birth before storing it in the refrigerator
  2. Have both the donor and collector sign the chain of custody form and verify the specimen temperature is within acceptable range (correct answer)
  3. Transport the specimen immediately to the laboratory while maintaining visual contact with the container at all times
  4. Document the collection time in the medical record and notify the ordering physician that the specimen has been obtained
Explanation: Chain of custody requires both the donor and collector to sign the custody form immediately after collection, and temperature verification ensures specimen validity. Choice A lacks the dual signature requirement and temperature check. Choice C describes transport procedures but misses the immediate post-collection documentation step. Choice D focuses on medical documentation rather than legal custody requirements.

Question 10

A phlebotomist is collecting blood specimens for a clinical research study that requires strict chain of custody. After completing the venipuncture, the research coordinator asks to temporarily take custody of the specimens to perform immediate processing in an adjacent room before returning them for final labeling. How should the phlebotomist respond?

  1. Allow the transfer since the research coordinator is authorized personnel and the specimens will be returned within the same facility
  2. Refuse the transfer unless the research coordinator signs for custody and the temporary transfer is documented on the chain of custody form (correct answer)
  3. Accompany the research coordinator to maintain visual custody of the specimens during the processing and return trip
  4. Complete all labeling and documentation first, then allow the research coordinator to take custody following standard transfer protocols
Explanation: Chain of custody requires documentation of every transfer, regardless of proximity or personnel authorization. Any custody change must be formally documented with signatures. Choice A ignores documentation requirements. Choice C attempts to maintain custody but doesn't address the research coordinator's processing needs. Choice D delays necessary processing but still lacks proper transfer documentation.

Question 11

A phlebotomist completes a blood collection for legal alcohol testing at 3:15 PM and documents this time on the chain of custody form. However, the facility's computer system timestamp shows 3:22 PM when the electronic record is created. The 7-minute discrepancy is due to the time needed to complete documentation. How should this time difference be addressed?

  1. Maintain the 3:15 PM collection time on the chain of custody form and add a note explaining that documentation was completed at 3:22 PM (correct answer)
  2. Use the computer timestamp as the official collection time since electronic records provide more accurate documentation than manual entries
  3. Average the two times and record 3:19 PM as a compromise that reflects the overall collection and documentation timeframe
  4. Change the chain of custody form to match the computer timestamp to ensure consistency between all documentation systems
Explanation: When handling legal specimens like blood alcohol tests, you must understand that the actual collection time is the legally significant moment, not when paperwork is completed. Chain of custody documentation requires absolute accuracy about when the specimen was obtained from the patient. The correct approach is A) because the 3:15 PM collection time represents the true moment when blood was drawn from the patient. This is the legally relevant timestamp that courts and attorneys need for calculating blood alcohol levels and establishing timelines. Adding a note about documentation completion time (3:22 PM) provides transparency and shows thorough record-keeping without compromising the integrity of the collection time. Option B) is incorrect because computer timestamps reflect data entry time, not collection time. Using 3:22 PM would misrepresent when the specimen was actually obtained, potentially affecting legal proceedings where precise timing matters for blood alcohol calculations. Option C) is wrong because averaging times creates a fictitious timestamp that represents neither the actual collection nor documentation completion. This could be seen as falsifying records in legal contexts. Option D) is incorrect because changing the chain of custody form to match computer records prioritizes administrative convenience over accuracy. The chain of custody form should always reflect the true collection time, as this document may be subpoenaed as evidence. Remember: For legal specimens, always document the actual collection time accurately and explain any discrepancies with additional notes rather than altering the primary documentation. The specimen collection time is a fact that cannot be changed for convenience.

Question 12

During a workplace drug screening collection, the donor provides a urine specimen that measures 89°F when tested immediately after collection. The acceptable temperature range is 90-100°F. The donor claims they have been drinking cold water all morning and requests to provide a second specimen. What is the correct procedure?

  1. Allow the donor to provide a second specimen immediately and document both temperature readings on the chain of custody form
  2. Document the out-of-range temperature as a possible dilute specimen and proceed with testing the original specimen as collected
  3. Record the collection as invalid due to temperature failure and follow facility protocol for suspected specimen adulteration (correct answer)
  4. Wait 30 minutes for the donor's body temperature to normalize, then allow collection of a second specimen under direct observation
Explanation: Temperature outside the acceptable range indicates possible specimen substitution or adulteration and invalidates the collection. Chain of custody protocols require treating this as a failed collection. Choice A ignores the invalid first specimen. Choice B mischaracterizes temperature failure as dilution. Choice D creates an improper delay and doesn't address the failed initial collection.

Question 13

During a pre-employment drug screening, a donor provides identification that shows the name 'Michael Johnson' but the requisition form lists 'Mike Johnson' for the same social security number. The donor states both names refer to him and that 'Mike' is a common nickname for 'Michael.' What is the most appropriate action regarding chain of custody procedures?

  1. Proceed with collection using 'Michael Johnson' from the ID and note the discrepancy on the chain of custody form for documentation purposes
  2. Document both names on the chain of custody form and collect the specimen since the social security number provides adequate identification verification
  3. Require the donor to provide additional identification that matches the exact name on the requisition before proceeding with specimen collection
  4. Contact the ordering employer to verify which name should be used and obtain authorization to proceed with the collection using the confirmed name (correct answer)
Explanation: Chain of custody procedures in drug screening require absolute precision in identification verification because these results can have serious legal and employment consequences. Any discrepancy in donor identification, no matter how minor it appears, must be resolved before proceeding with collection. When you encounter name discrepancies like "Michael" versus "Mike," you cannot make assumptions about their equivalence, even when they seem obviously related. The chain of custody documentation must match exactly with the ordering information to maintain legal integrity. While the donor's explanation about nicknames may be reasonable, phlebotomists lack the authority to make identification determinations that could affect the validity of test results. Option D is correct because contacting the ordering employer ensures proper authorization and clarifies which name should be used for legal documentation. This maintains the integrity of the chain of custody while involving the appropriate authority to resolve the discrepancy. Option A fails because proceeding with collection despite known discrepancies compromises chain of custody integrity, even with documentation notes. Option B is incorrect because having matching social security numbers doesn't resolve the name discrepancy issue - both the name and identifying information must align perfectly. Option C seems logical but places the burden incorrectly on the donor when the issue may be a simple clerical error on the requisition form. Remember: In drug screening collections, when in doubt, always contact the ordering party. Chain of custody procedures prioritize accuracy and legal defensibility over convenience, and resolving discrepancies upfront prevents complications later.

Question 14

A phlebotomist is preparing to collect specimens for a paternity test. The alleged father arrives with proper identification, but the mother brings a 3-year-old child and states she forgot to bring the child's birth certificate. The mother has proper ID and claims to be the legal guardian. How should the phlebotomist proceed with the chain of custody requirements?

  1. Proceed with collection from both the mother and child since the mother's identification establishes her parental authority for consent
  2. Collect specimens from the adult participants only and reschedule the child's collection when proper documentation can be provided (correct answer)
  3. Require alternative identification for the child such as a medical insurance card or recent medical records before proceeding
  4. Document the identification limitation on the chain of custody form but proceed with collection since the mother can provide verbal verification of the child's identity
Explanation: Legal paternity testing requires proper identification for all participants, including minors. Without required documentation, the child's specimen cannot be collected while maintaining chain of custody integrity. Choice A ignores identification requirements for the child. Choice C accepts alternative forms that may not meet legal standards. Choice D compromises documentation requirements with verbal verification.

Question 15

A chain of custody form shows three individuals have handled a drug screening specimen: the original collector, a laboratory courier, and the receiving technologist. The form indicates the specimen was transferred at 10:30 AM and received at 2:45 PM the same day, but the courier's signature line shows a date that is one day earlier than the collection date. What is the most appropriate action?

  1. Accept the specimen since the time stamps are consistent and only the date appears to be a clerical error that doesn't affect specimen integrity
  2. Contact the courier to verify the correct date and have them initial any corrections made to the chain of custody documentation
  3. Reject the specimen due to chain of custody documentation discrepancy and request a new specimen collection with proper documentation (correct answer)
  4. Process the specimen but flag it as having documentation irregularities and notify the medical review officer of the discrepancy
Explanation: Chain of custody requires perfect documentation accuracy for legal defensibility. Any discrepancy in dates, signatures, or transfers can invalidate the specimen legally. Choice A minimizes the significance of documentation errors. Choice B suggests corrections that could be viewed as tampering. Choice D compromises the legal integrity by processing a flawed chain of custody.