GS1 US Unique Device Identification Help Center

For Resolving GUDID Data Deficiencies

Use these resources to help you resolve your GUDID data efficiencies

Resources to Help You Resolve Your Specific GUDID Data Deficiency Issue

U.S. FDA Resources

Global Trade Item Number Formats

The GTIN is the globally unique GS1 Identification Key used to identify “trade items” (i.e., products and services that may be priced, ordered or invoiced at any point in the supply chain). GTINs are assigned by the brand owner of the product and are used to identify products as they move through the global supply chain to the hospital or ultimately the patient.

The GTIN uniquely identifies a product at each packaging level (e.g., a box of 15 Brand X tissues; a carton of six boxes of Brand X tissues; etc.). GTINs can be encoded into barcodes and used in supply chain transactions (e.g., purchase order; invoice; etc.) to promote accurate product identification.

The table below illustrates GTIN formats.

GTIN Chart

Additional Resources

If you have additional questions please contact the GS1 US UDI Help Center at or a +1.800.761.4872.

*For information about the rule, see the U.S. FDA Unique Device Identification System 

Disclaimer: GS1 US is the local GS1 Member Organization that supports implementation of the GS1 System in the United States. GS1 US employees are not representatives or agents of the U.S. FDA, and the content herein has not been reviewed, approved, or authorized by the U.S. FDA.

GS1 is a U.S. FDA-Accredited Issuing Agency for UDI, and GS1 Standards are authorized for use in implementing the requirements of the U.S. FDA UDI Rule.