Specimen Receipt and Processing SOP: Chain of Custody and Traceability

Quick summary: receipt is a three-part step — take control of the specimen, judge whether it is fit to test, and record both facts. This SOP covers the receiving bench, the acceptance and rejection decisions, and the chain of custody records that keep a result traceable.

A specimen arrives at a receiving bench, and within a few minutes three things have to happen. The laboratory takes physical control of it, decides whether it is fit to test, and writes both facts down. That is the whole of receipt: a documented step, not a doorway.

Practical note: this SOP covers what happens from the moment a bag is handed over at the receiving bench. Packaging and courier rules for the journey before that point are covered in a separate transport workflow guide.

International practice treats receipt as part of the pre-examination phase. ISO 15189:2022, the standard Canadian medical laboratories are assessed against, requires documented procedures for handling, transport, receipt, acceptance and rejection of samples, and requires records showing the procedure was followed. Underneath that sits the Ontario licensing frame: the Laboratory and Specimen Collection Centre Licensing Act licenses the laboratory or collection centre, and O. Reg. 45/22 sets the working rules that a public health inspector reads from, including requisitions (s. 17), specimen collection (s. 18), the restriction that specimens be submitted only to a licensed laboratory (s. 21), recordkeeping obligations (s. 22) and reporting obligations (s. 23).

Custody is the other half of the sentence. It begins when the specimen is collected, but responsibility for judging the specimen passes to the laboratory at handover, and every later transfer — aliquot, referral, return, disposal — belongs to the same chain. A laboratory that can produce a result but cannot show who held the specimen is one audit finding away from a serious accreditation problem. The consumable guides that support these records are collected in the clinical learning hub.

What has to be checked before the courier hands over the bag?

The handover is the weakest link in most laboratories, because it is the moment when two organizations each assume the other has checked something. A receipt SOP should make the check explicit and short enough to survive a busy morning: the outer packaging is intact and dry, the specimen bag is sealed, the primary containers are counted against the requisition, the paperwork travels in the rear pocket rather than taped to a container, and the courier's run sheet is signed and timed.

Category B specimens travel under UN3373 packaging rules. The requirement is a leak-proof primary container, absorbent material, a secondary container that holds 95 kPa without leaking, and a rigid outer box for post or air. The 95 kPa figure is the pressure difference the secondary packaging has to withstand; it is a specification printed on compliant 95 kPa specimen bags, and it is not the same thing as a general-purpose zip bag.

Three decisions are worth writing into the SOP rather than leaving to habit. Who is authorized to sign the handover. What happens when a courier arrives without a run sheet. What to do when the outer box is wet — because the answer is never to open it on the receiving bench and carry on.

What does a laboratory check at the moment of receipt?

Acceptance criteria are the core of the SOP. They should be short, written, applied by every shift, and applied in the same way on a quiet Wednesday as on a Friday evening. In practice a laboratory verifies two patient identifiers against the requisition, the container type and additive, the fill volume against the additive ratio, the physical condition of the container and closure, the time from collection against a stability window, and the transport temperature where the test requires it. Anything outside those limits is a rejection decision, not a judgement call.

How should a rejected specimen be handled?

Rejection is a clinical event, not a filing decision. The patient has already been sampled, so the cost of a silent rejection is a delayed result or a repeat collection. The SOP should require the reason to be recorded as a code from a fixed list, the decision written in the laboratory information system against the accession number, the requester notified within a stated period, and a repeat request that names what has to change.

The literature is clear about where the errors sit. Once a specimen leaves the patient, pre-analytical problems — identification, collection, transport and storage — account for the largest share of laboratory error, a finding that has held across reviews of the pre-analytical phase for more than a decade. Rejection studies classify the causes that recur: hemolysis, insufficient volume, the wrong container or additive, and unlabelled or mislabelled containers. Hemolysis on its own has been studied as a distinct analytical problem because it changes results rather than merely inconveniencing a bench. Rejection logs are the laboratory's own version of that dataset, and reviewing them once a year turns a complaint list into a quality metric.

Two habits keep rejection defensible. The specimen is retained until the requester has been informed and a repeat is arranged, and the disposal of that retained specimen is recorded like any other custody event. A specimen that disappears into the biohazard stream without an entry is an unanswered question at the next assessment; biohazard waste bags belong at the end of a recorded process, not in place of one.

How is the chain of custody recorded from receipt to result?

One row per event. The minimum that makes a chain defensible is the accession number, two patient identifiers, the requester, the collection date and time, the receipt date and time, the identity of the person who received the specimen, the condition on arrival, the tests registered, the storage location after receipt, and every subsequent transfer. Each transfer records the same three facts: who held the specimen, when, and in what condition.

Two points are usually weakest. Initials that identify a shift rather than a person, and referrals where the paperwork stops at the door while the specimen travels on. Ontario's rules for collection centres point in the same direction: O. Reg. 45/22 requires records of the individuals who attended, the specimens taken or collected, and the person who made the requisition (s. 22), and the same regulation carries the Mandatory Blood Testing Act, 2006 provisions (s. 20.1), where a documented handover is a legal requirement rather than an administrative courtesy.

How is traceability maintained through processing and storage?

Traceability is what lets a laboratory answer a question months later: which specimen produced this result, and what happened to it in between. Four habits carry it. Aliquots are labelled at the bench with two identifiers, the accession number, and the date and time. The accession number stays on every worklist and instrument batch record, so a result can be traced back from the instrument rather than from memory. The laboratory information system audit trail is used instead of free-text corrections, because a timestamped edit is evidence and a re-written sticky label is not. Primary containers are stored at a stated temperature for a stated period, separate from patient-ready areas.

Retention is the part of the SOP most often left vague, and it is one of the first things an assessor asks about. The period belongs to the laboratory, informed by the test, the stability of the analyte and the requirements of the accreditation body, but the SOP has to state it together with the storage temperature, who may release a retained specimen for add-on testing, and how disposal is authorized and recorded. A laboratory that cannot state its own retention period has a documentation gap rather than a storage problem.

The containers do part of this work. A sterile 120 mL screw-cap specimen container with a legible label area is a traceability decision as much as a purchasing one, in the same way that individually wrapped cotton swabs and graduated leak-proof specimen cups decide how cleanly a swab or urine specimen enters the transport medium. When those lines are reordered, the label size and closure are part of what is being specified.

What does an assessment or inspection ask to see?

The question is never whether the laboratory meant well. It is whether the record exists and whether it matches what the laboratory information system says. A receipt and processing SOP is examined through a short list of evidence:

• the current SOP, with a version date, an approval record and a review cycle
• training and competency records for the staff who receive, accession and process specimens
• the acceptance and rejection log, sampled against the laboratory information system
• temperature records for storage, transport and any cold chain in use
• deviation and corrective action records, including the follow-up on each rejected specimen
• referral records for every specimen sent to a reference laboratory
• the internal audit and management review cycle, with the actions closed out

CALA, which accredits medical laboratories in Canada against ISO 15189, works from this record set, and an assessor will usually pick a handful of results and walk them backwards. A public health inspector looking at a collection site works from the licensing frame instead, where O. Reg. 45/22 sets what has to be recorded and what may be tested where. Either way the answer comes from the log rather than from recollection.

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References and standards cited

1. Ontario e-Laws — Laboratory and Specimen Collection Centre Licensing Act, R.S.O. 1990, c. L.2 (statute page) (link checked 25 September 2026)
2. Ontario e-Laws — O. Reg. 45/22: General, under the Laboratory and Specimen Collection Centre Licensing Act (regulation page) (link checked 25 September 2026)
3. Ontario e-Laws — O. Reg. 45/22 full text, Word document: requisitions (s. 17), specimen collection (s. 18), restriction on submission of a specimen to a laboratory (s. 21), recordkeeping obligations (s. 22) (link checked 25 September 2026)
4. CALA — accreditation program for medical laboratories in Canada (link checked 25 September 2026)
5. CSMLS — Canadian Society for Medical Laboratory Science, professional resources (link checked 25 September 2026)
6. Clinical and Laboratory Standards Institute — standards and guidelines index for laboratory quality (link checked 25 September 2026)
7. Public Health Ontario — infection prevention and control guidance hub (link checked 25 September 2026)
8. Public Health Ontario — provincial guidance on cleaning, disinfection and sterilization of medical equipment and devices in health care settings (PDF) (link checked 25 September 2026)
9. IPAC Canada — infection control standards and guidelines resource centre (link checked 25 September 2026)
10. Canadian Centre for Occupational Health and Safety — biological hazards (link checked 25 September 2026)
11. World Health Organization — Laboratory biosafety manual, 4th edition (link checked 25 September 2026)
12. Public Health Agency of Canada — Canadian Biosafety Standard and Guidelines (Government of Canada) (link checked 25 September 2026)
13. CSA Z314-18, Canadian medical device reprocessing (standards store listing) (link checked 25 September 2026)
14. CSA Z314:23, Canadian medical device reprocessing in all health care settings — scope, edition history and clause list (link checked 25 September 2026)
15. Biochemia Medica — Specimen rejection in laboratory medicine: necessary for patient safety? (PubMed 26527231) (link checked 25 September 2026)
16. Biochemia Medica — clinical biochemistry laboratory rejection rates due to various types of preanalytical errors (PubMed 25351356) (link checked 25 September 2026)
17. Clinical Chemistry and Laboratory Medicine — pre-analytical phase errors constitute the vast majority of errors in clinical laboratory testing (PubMed 40311145) (link checked 25 September 2026)
18. Critical Reviews in Clinical Laboratory Sciences — managing hemolyzed samples in clinical laboratories (PubMed 31603708) (link checked 25 September 2026)
19. Ontario — C-4 management of biomedical waste in Ontario (link checked 25 September 2026)

Related Reading

• ISO 15189 vs CSA Z314: Sterilization Records in a Canadian Medical Laboratory
• From Point-of-Care Site to Central Lab: A Compliant Specimen Transport Workflow
• Ontario Laboratory Licensing: What the LSCCLA Requires for Specimen Handling
• autoclave log template

Frequently Asked Questions

What should a specimen receipt SOP include?

At minimum: who may receive a specimen, what is checked at handover, the acceptance criteria for each specimen type, the rejection reasons and who communicates them, where each fact is recorded, and how referrals, retention and disposal are authorised. The SOP also has to name the records it creates and the retention period for each one.

Who is responsible for a specimen once it reaches the laboratory?

Responsibility passes at the handover, when a named person in the laboratory accepts the specimen and records receipt. From that point the laboratory is accountable for its condition, storage, testing and eventual disposal. The collector remains accountable for what happened before collection and for the requester's answers on the form.

What are the acceptance criteria for a specimen at receipt?

Fixed criteria applied by every shift: two patient identifiers that match the requisition, correct container type and additive, adequate fill volume for that additive, a readable label, an intact closure, transport within the stated time and temperature window, and no visible leakage or contamination of the packaging.

What should happen to a rejected specimen?

Record a rejection reason from a fixed list, enter it in the laboratory information system against the accession number, notify the requester within a stated time, retain the specimen until the repeat has been arranged, and ask for a repeat that names what has to change. Nothing is discarded until the notification is on file.

How long must a laboratory keep a specimen?

The period is set by the laboratory's own SOP, informed by the test, the stability of the analyte and the requirements of the accreditation body that assesses it. The SOP should state the period, the storage temperature, who may release a retained specimen for add-on testing, and how disposal is authorised and recorded.

What does chain of custody mean for a laboratory specimen?

It is the documented sequence of every person and place that held the specimen, from collection to disposal, with the date, time and condition recorded at each transfer. A chain of custody is defensible only if each entry identifies a person rather than a shift, and if the entries are continuous with no unexplained gap.

Does a courier handover form count as chain of custody evidence?

It counts as the transport leg of the chain when it records the sender, the consignee, the date and time, the packaging used and the condition on arrival. It does not replace the laboratory's receipt entry, and it is not enough on its own for specimens that are referred onward to another laboratory.

What records does an assessment ask to see?

The current SOP with its version and review date, competency records for the staff who receive and accession specimens, the acceptance and rejection log, temperature records for storage and transport, deviation and corrective action records, referral records, and the internal audit cycle. Assessors sample records against the laboratory information system.

Last updated: September 2026. CliniEco Medical is a licensed medical device establishment (MDEL #35334).