Specimen Tracking

February 2026 · 6 min

Overview

Specimen Tracking provides end-to-end traceability for every sample from the moment of collection to final disposal. This chain of custody is critical for accurate result attribution, medico-legal defensibility, and accreditation compliance (NABL, CAP, ISO 15189).

Every status change is timestamped with the operator ID and location, creating an immutable audit trail. If a result is ever questioned, the complete specimen journey can be reconstructed in seconds.

Collection & Labeling

At the point of collection, the phlebotomist:

1. Verifies patient identity -- Scans the wristband (IPD) or confirms name + UHID (OPD).
2. Prints barcode labels -- The system generates labels with patient name, UHID, test codes, sample type, tube type, and a unique barcode. Labels are printed on-demand from the collection station.
3. Affixes labels -- Labels are applied to tubes immediately after collection, before leaving the patient's side. This prevents sample mix-ups.
4. Records collection metadata -- Fasting status, collection site (left/right arm), collector name, and any collection difficulties (difficult draw, hemolysed on draw).
5. Marks as Collected -- The barcode scan transitions the order to 'Collected' status with a timestamp.

For outpatient walk-ins, the registration counter pre-prints labels so tubes are ready when the patient arrives at the collection room.

Transport & Chain of Custody

For multi-location facilities (collection center to main lab, ward to lab), transport tracking ensures samples are not lost or delayed:

• Transport Containers -- Samples are placed in tracked containers (cooler boxes, pneumatic tube carriers). Each container has its own barcode.
• Handoff Logging -- When a container moves between staff (phlebotomist to runner, runner to lab reception), both parties scan to log the handoff.
• Temperature Monitoring -- For temperature-sensitive samples (cold-chain specimens, blood gases), IoT temperature loggers in the container record conditions. Out-of-range alerts trigger immediately.
• Transit Time Tracking -- The system calculates transit time and flags samples that exceed the maximum allowable transit duration (e.g., blood gas must reach the analyzer within 15 minutes).

For small clinics where the lab is on-site, this simplifies to a direct scan at collection and a scan at lab receipt -- still maintaining the audit trail.

Lab Receipt & Accessioning

When samples arrive at the lab:

1. The lab receptionist scans each tube or the container barcode (which auto-scans all contained tubes).
2. The system checks:
   • Sample integrity -- Is the tube type correct? Is the volume sufficient? Is the label intact and readable?
   • Transport conditions -- Was the transit time within limits? Was temperature maintained?
   • Order validity -- Is the order still active? Has it been cancelled?
3. Accepted samples transition to 'Received' status and are routed to the appropriate section (Biochemistry, Haematology, etc.).
4. Rejected samples are documented with a rejection reason (hemolysed, clotted, insufficient volume, wrong container, expired transport time) and a re-collection order is generated.

Rejection rates are tracked per phlebotomist and per collection site for quality improvement.

Processing & Aliquoting

During lab processing:

• Centrifugation -- Samples requiring serum/plasma separation are logged with centrifuge ID, speed, and duration.
• Aliquoting -- When a sample needs to be split (e.g., serum for biochemistry + serum for serology), each aliquot gets a derived barcode linked to the parent sample. The chain of custody extends to every aliquot.
• Loading onto Analyzers -- The barcode scan at the analyzer creates a processing timestamp. For integrated analyzers, this happens automatically via host query.
• Manual Processing -- For manual tests, the technician logs each processing step with timestamps.

Retention & Disposal

After testing:

• Retention -- Samples are moved to the retention area with a configurable retention period (e.g., 48 hours for routine, 7 days for histopathology, 30 days for medico-legal cases).
• Storage Location -- The system tracks rack, shelf, and position for rapid retrieval if a re-test is needed.
• Re-Testing -- If a doctor or pathologist requests a repeat test on the retained sample, it can be retrieved by scanning the barcode. The re-test result links back to the original sample.
• Disposal -- When the retention period expires, samples appear in the Disposal Queue. After disposal (autoclaving for biohazard, chemical treatment), the operator logs the disposal method, date, and batch. The specimen lifecycle is complete.

Biomedical waste manifests for sample disposal integrate with the Biomedical Waste Management module.

Notes

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