AI (21) Serial Number

GS1 Application Identifier (21), item-level serialisation.

Definition

Combined with a GTIN, AI (21) forms a unique instance identity (SGTIN), the basis of the serialisation required notably by the Falsified Medicines Directive and the GS1 EPCIS standard. Being variable length (1 to 20 characters), it requires an FNC1 separator when it is not the last field in the string.

Origin

Defined in section 3.2 of the GS1 General Specifications (Application Identifier definitions), maintained by GS1.

Example in context

(01)09506000134352(21)SN0001 — serialised GTIN in GS1 DataMatrix.

Related terms

• AI (10) batch/lot — traceability at lot level rather than unit level.