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Barcode Labelling: Essentials for Data Integrity

23 Sep 2025

Author: CILS International

Barcoding and automatic identification and data capture (AIDC) have transformed how laboratories identify, track and trace samples and patient data. By replacing manual labeling with barcode labels, laboratories achieve greater accuracy, efficiency and data security.

What is a barcode?
A barcode is a machine-readable pattern containing information about the labelled item:

Linear barcodes: Encoded in parallel lines, with Code 128 the most common in laboratories thanks to its compact, high-density format.
2D barcodes: Encoded in a grid of squares or dots, such as Data Matrix or QR codes, which can store thousands of characters in a small area.

Both are scanned by imagers that instantly decode and transfer data to laboratory systems.

Choosing the Right Barcode and Labels

Space: Use cap-and-tube label pairs for microvials and centrifuge tubes. A 2D code on the cap allows scanning without removing the tube.
Date: Code 128 linear barcodes are ideal for high-density alphanumeric data. Data Matrix codes suit small labels with larger data needs.
Readability: Print at 300 dpi or higher for sharp, scannable barcodes.

Printing Options

In-house: Thermal transfer printing delivers excellent durability if the right ribbon and material are matched.
Outsourced: Pre-printed durable labels save time, avoid print errors and ensure reliable performance in harsh lab conditions.

CILS Barcode Labels being applied to microscope slideStrengthen Your Laboratory Labeling Strategy

Best practice for durable labeling includes using thermal transfer printing to ensure maximum durability, matching the label material with the correct ribbon, avoiding low-contrast printing that can impair readability, and including human-readable text as a backup in case scanning fails.

Durable barcode labels are essential for efficient, error-free laboratory sample management. Whether printed in-house or supplied pre-printed, the right solution ensures accurate data capture and reliable performance.

Upgrade your laboratory labeling system today. Contact the our label specialists for advice on durable labels, pre-printed solutions and thermal transfer printing.

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