Phlebotomy · Processing · 7 min read
Chain of Custody Procedures
- Identify the legal principles, testing scenarios, and documentation requirements that govern chain-of-custody specimen collections.
- Execute step-by-step procedures for donor identification, Custody and Control Form completion, tamper-evident sealing, and secure specimen handling.
- Recognize protocol discrepancies, collection flaws, and tampering indicators, and follow appropriate protocols for reporting these issues to a supervisor.
Principles and Scope of Chain of Custody
In healthcare, most blood and body fluid collections are intended for routine diagnostic medical laboratory tests. These clinical evaluations help physicians identify illness and monitor patient care. Routine diagnostic tests do not typically require legal tracking protocols. However, certain specimens serve an entirely different purpose: they provide documentation that may support the specimen's use as legal evidence in an official investigation, administrative proceeding, or courtroom trial. When specimen collection intersects with the legal system, healthcare professionals must follow chain-of-custody procedures.
Chain of custody is defined as a formal legal process tracking a specimen continuously from the exact moment of collection through its final disposal. The essential purpose of these procedures is to protect specimen integrity and document the handling needed to support identification of the sample tested as the one collected from the individual. Think of chain of custody as an unbroken, documented paper trail. Chain-of-custody documentation records who handled a specimen and how it was secured, helping investigators assess its integrity; it cannot by itself prove that the specimen was unadulterated.
Chain of custody applies to several distinct legal and regulatory situations. These include workplace drug and alcohol screenings, legal blood alcohol concentration testing ordered by law enforcement, and forensic specimen collection during criminal investigations. Chain-of-custody protocols also apply to court-ordered paternity testing and to toxicological specimens collected during post-mortem examinations. In addition, chain-of-custody procedures may apply to athletic anti-doping testing programs and to clinical trials whenever mandated by the specific study protocol. Because legal evidence must withstand intense formal scrutiny, a legal specimen collected without proper chain-of-custody documentation may be challenged or ruled inadmissible in legal proceedings.
| Operational Feature | Routine Diagnostic Testing | Chain-of-Custody Testing |
|---|---|---|
| Primary Objective | Medical evaluation and patient care management | Protecting integrity and supporting use as legal evidence |
| Documentation Standard | Standard clinical requisitions without legal tracking | Custody and Control Form (CCF) or specialized legal custody forms |
| Storage and Transfer Requirements | Standard clinical specimen handling and transport | Locked, restricted-access storage with documented custody transfers |
| Common Applications | Non-legal diagnostic medical laboratory evaluations | Workplace screenings, legal BAC, forensics, and paternity cases |
Common mistakes
- Using an isopropyl alcohol pad to cleanse the venipuncture site for a legal blood alcohol test, which violates protocol; a non-alcoholic antiseptic such as an aqueous povidone-iodine solution or an alcohol-free chlorhexidine formulation should be used if permitted by the legal collection protocol.
- Failing to check and record the temperature of a DOT-regulated urine specimen within four minutes of collection, or failing to report a temperature reading outside the 90 to 100 °F (32 to 38 °C) range to the supervisor or designated program contact.
- Attempting to explain, discuss, or interpret drug screen or toxicology results for a patient or an employer, which exceeds the phlebotomist's legal and professional scope of practice.
- Failing to report a damaged, broken, torn, or reattached tamper-evident seal immediately to a supervisor before packaging the specimen.
Key points
- Chain of custody is a formal legal process tracking a specimen from collection to final disposal to preserve integrity and provide documentation supporting its use as legal evidence.
- Chain of custody applies to workplace drug tests, legal blood alcohol tests, forensics, paternity testing, post-mortem toxicology, and select athletic anti-doping or clinical trial protocols, but is not typically required for routine diagnostic tests.
- Patient identification must follow protocol rules; if valid identification is lacking, or if identifiers conflict with the Custody and Control Form, the phlebotomist must contact the supervisor or requesting agency and resolve discrepancies before collection.
- For legal blood alcohol testing, site preparation requires a non-alcoholic antiseptic, never isopropyl alcohol, and collection tubes, commonly gray-top tubes containing sodium fluoride and potassium oxalate, must be filled to the indicated volume.
- DOT-regulated urine drug collections require collection-site security measures, including securing accessible water sources and using bluing agent when applicable, and a specimen-temperature check within four minutes of receipt; an out-of-range reading requires the prescribed follow-up collection procedure.
- When required by the protocol, apply tamper-evident seals in the donor's presence, obtain the donor's initials when required, inspect the seals, and keep the sealed specimens secure; use locked, restricted-access storage when the protocol requires it.
- Document custody transfers with the dates, times, signatures, electronic entries, or shipping records required by the applicable protocol, and promptly report documentation flaws, damaged seals, or suspected tampering.
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