Standards
Global Trade Item Number (GTIN)
A GS1 identifier for trade items at a defined packaging or presentation level.
- Kind
- Identifiers
- Steward
- GS1
- Official source
- https://www.gs1.org/standards/id-keys/gtin
What it describes
A GTIN identifies a trade item as defined by GS1 allocation rules. Different package sizes or trade-item configurations can require different GTINs, so the code should be matched to the exact item level in a source. GTINs support exchange of product references among manufacturers, retailers, distributors, and data services without relying on product names alone.
A GTIN is not a serial number and does not identify one physical unit. It also does not prove origin, authenticity, regulatory approval, or current availability. The check digit detects common transcription errors but does not verify that a number was issued to the claimed party. Keep the issuing or observed product record and package description alongside the code.
Structure
GTIN-8, GTIN-12, GTIN-13, or GTIN-14; final digit is the GS1 mod-10 check digit.
Useful for
- Join catalog records for the same trade item.
- Distinguish package levels.
- Validate transcription with a check digit.
Limits
- Does not identify an individual unit.
- Does not prove authenticity.
- Different packaging can require different GTINs.
How it is used in practice
The GTIN is the number encoded in the barcode on a retail pack, and the same number is used in product catalogues, order messages and shipping documents. GS1 issues company prefixes to member companies, and each company then allocates item numbers under its prefix according to GS1's allocation rules. The result is a number that retailers, distributors and data services can use to refer to the same trade item without agreeing on a product name.
The identifier follows the packaging hierarchy. A single bottle, a carton of twelve and a pallet of cartons are different trade items for ordering and logistics, and each level that is traded as a unit needs its own GTIN. Healthcare and life-science supply chains lean on this: a dispensing unit, a shipping case and a pallet are tracked at different levels, and an error in the level changes the quantity a record claims.
A worked example
Halden Therapeutics AG (fictional) sells a diagnostic reagent kit. The kit has a GTIN printed on its retail box, and the carton of ten kits has a different GTIN. A distributor's order file lists a quantity of 100 against the carton GTIN, while the hospital's receipt file lists 100 against the kit GTIN.
A reconciliation that matches on GTIN alone will treat these as the same line and report agreement, even though the distributor shipped ten times as many kits as the hospital received. A better reconciliation records the packaging level for each GTIN, using the manufacturer's product data, and converts both sides to a common unit before comparing. The finding is then stated plainly: the quantities disagree by a factor consistent with a packaging level mismatch, and the cited sources are the order file, the receipt file and the product data sheet with the carton configuration.
Evaluating a claim that rests on a GTIN
Ask what the claim needs from the identifier. If the claim is that two catalogue rows describe the same trade item, matching GTINs with the same packaging description is strong evidence. If the claim is that the product is genuine, approved for a market, in stock or manufactured at a given site, a GTIN does not help, and the claim needs regulatory, supplier or inspection records.
Check the number itself. The check digit catches most single-digit and many transposition errors, so a failure indicates a copying fault. A pass indicates only that the digits are internally consistent. Leading zeros are a frequent source of silent damage when GTINs pass through spreadsheets that treat them as numbers; a GTIN-12 can appear as an 11-digit value and then fail to match a GTIN-13 or GTIN-14 representation of the same item. Record the form in which the number was received, and pad or normalize in a separate field.
Confusions to avoid
A GTIN is often confused with a serial number. It names a kind of item, not one physical unit, so two bottles from the same batch share a GTIN. Traceability systems pair the GTIN with a batch or serial attribute to identify an individual pack, and a record that uses the GTIN alone cannot support a claim about one specific unit.
It is also confused with a drug identifier. In the United States a medicine is identified in regulatory data by its National Drug Code, and a GTIN on the same pack is a commercial identifier that may encode the NDC under certain conventions but is governed by separate rules. When a record needs to say both, it should keep both identifiers and cite where each came from.
Questions a reviewer can ask
Which packaging level does the GTIN identify, according to the manufacturer's product data? Does the check digit validate, and was the number stored as text? Was the GTIN taken from a pack image, a catalogue or a supplier file, and do they agree? Does the claim concern the item type or a particular unit, and if a particular unit, where are the batch or serial attributes? Is the product still sold under this number, and what is the evidence for that?
Related terms
Found an error on this page? See corrections for what counts as one, how to report it and the dated log.
Enquiry
Which of your sources carry Global Trade Item Number (GTIN)?
Tell us which sources carry it, which key the same entity some other way and who may read which. We reply with whether and how a first record would use this identifier.
Or write to [email protected] in your own words.