Accession Number
A unique identifier assigned to each sample upon receipt in the laboratory, enabling complete tracking and traceability throughout the testing process.
What is an Accession Number?
- Accession Number
- An accession number is a unique identifier assigned to a sample or specimen when it is received and logged into the laboratory system. This number serves as the primary key for tracking the sample through every step of the testing process—from receipt and accessioning through analysis, result reporting, and archival.
Common Accession Number Formats
Sequential
Simple incrementing numbers
12345, 12346, 12347...Date-Based
Includes date prefix
2026-01-28-0001Coded
Includes lab/department codes
CHM-2026-00123Alphanumeric
Mixed characters for uniqueness
A7X2B9C4Purpose and Benefits
Unique Identification
Prevents sample confusion and mix-ups with guaranteed uniqueness
Complete Traceability
Links all activities, results, and documents to a single identifier
Chain of Custody
Documents sample handling from collection to disposal
Barcode Integration
Enables automated scanning for error-free processing
Result Correlation
Associates all test results with the correct sample
Audit Trail
Supports regulatory compliance with complete history
The Accessioning Process
Sample Receipt
Verify sample condition, labeling, and accompanying documentation
Number Assignment
LIMS generates unique accession number (often with barcode)
Label Application
Print and apply accession labels to sample containers
Data Entry
Enter patient/client info, tests ordered, and collection details
Sample Sorting
Route samples to appropriate testing departments
Tracking Begins
All subsequent activities linked to accession number
LIMS Best Practice
Configure your LIMS to auto-generate accession numbers using a format that includes meaningful segments (date, location, sequence) while ensuring global uniqueness. Enable check digits to catch data entry errors and integrate with barcode printing for automated sample handling.