ISO 15223 is the international standard that defines the graphical symbols medical device manufacturers use to convey label and packaging information, such as manufacturer, expiry date, lot number, and sterility. Its active part, ISO 15223-1, sets general requirements for symbols placed on the device, on packaging, or in the accompanying information.
What is ISO 15223?
ISO 15223 is published in two parts by ISO Technical Committee 210. Part 1 of ISO 15223-1 lists the recognized symbols and the rules for their use. Part 2 of ISO 15223 describes how new symbols are developed, selected, and validated before they are included in Part 1. In a regulatory context, “ISO 15223” almost always means ISO 15223-1.
The standard exists so a single picture can replace text that would otherwise need translation into many languages. A symbol for “use by,” “do not reuse,” or “keep dry” means the same thing in any market. ISO 15223-1 specifies each symbol, its title, its meaning, and notes on correct use. The current edition is the fourth (2021), which replaced the 2016 edition and added symbols tied to the EU Medical Device Regulation, including the “MD” medical device indicator and importer, distributor, and translation symbols. These additions show why edition control matters when applying the standard.
Why ISO 15223 Matters in Medical Device Development
Labeling is a regulated output, not an afterthought. ISO 15223 matters because the symbols on a label are how a device communicates safety-critical information at the point of use: sterility status, single-use restriction, storage limits, and traceability data like lot or serial number. Get a symbol wrong, and you risk misuse, a field correction, or a rejected submission.
Regulators treat the standard as the reference for symbol usage. In the EU, EN ISO 15223-1:2021 is harmonized under Regulation (EU) 2017/745 (the MDR), so symbols drawn from it carry a presumption of conformity and generally do not need to be explained in the instructions for use. The U.S. FDA recognizes ISO 15223-1 in its Recognized Consensus Standards database, allowing manufacturers to reference it in a declaration of conformity. Aligning labeling early avoids rework late in a program, when changes are expensive and can trigger revalidation.
How ISO 15223 Works
ISO 15223-1 organizes symbols into groups and assigns each a defined meaning and a reference number. A label designer selects the applicable symbols, applies them at a legible size, and confirms the chosen set matches the regulatory requirements of each target market. The steps in practice:
- Identify the information your device must communicate (manufacturer, date of manufacture, expiry date, lot or serial number, sterility, single-use, and other items required by EU MDR Annex I or FDA labeling rules).
- Map each information element to the corresponding ISO 15223-1 symbol.
- Apply each symbol at a size and resolution that stays clear on the actual label and packaging.
- Decide where each symbol appears: on the device, on the packaging, or in the instructions for use.
- Confirm whether any symbol needs explanatory text, which depends on the market and whether the device reaches lay users. In the EU, recognized symbols generally do not need explanatory text in the instructions for use; in other markets, or for lay users, additional explanation may still be required.
ISO 15223-1 connects to other parts of the file. It draws defined terms from ISO 13485 (quality management), ISO 14971 (risk management), and ISO 20417 (information supplied by the manufacturer). IEC 60601-1, Section 7, also calls out symbols from ISO 15223-1 for medical electrical equipment. Symbols specified in other standards fall outside its scope, so a graphic governed by another standard is controlled by that document, not this one.
Common Challenges and Best Practices
The most common mistake is treating symbol selection as a copy-paste task. Symbols carry conditions. The “translation” symbol, for example, is meant for an entity that is not the manufacturer, and the importer and distributor symbols identify those roles under the MDR. Using a symbol without its conditions can create a nonconformity.
A second pitfall is version drift. ISO 15223-1:2021 added symbols and revised wording compared with the 2016 edition, and Amendment 1 (2025) modified the authorized representative entry and the EC REP symbol. Teams that hard-code an old symbol set can fall out of step with the version a regulator currently recognizes, which can differ across jurisdictions.
Good practice looks like this: keep a controlled symbol glossary tied to the edition you declare conformity to, verify that edition against the live FDA and EU lists before each release, test legibility on the real substrate (small implant cards are unforgiving), and confirm for lay-facing devices whether each symbol still needs a text explanation. Treat labeling changes as design changes, since guidance such as MDCG 2020-3 can classify them as significant.
Frequently Asked Questions
ISO 15223-1 contains a catalog of recognized medical device symbols and rules for their use on labels, packaging, and instructions for use. ISO 15223-2 is the methodology standard that governs how a proposed symbol is developed, selected, and validated for comprehension before it can be included in Part 1. Manufacturers apply Part 1; Part 2 mainly concerns symbol developers.
ISO 15223 is a voluntary consensus standard, but using it is the practical route to compliance. EU MDR Annex I requires that information supplied by the manufacturer use internationally recognized symbols where appropriate, and EN ISO 15223-1 is harmonized with the MDR. The FDA recognizes ISO 15223-1, so conformance supports U.S. submissions. Most global manufacturers adopt it rather than create custom symbols.
The fourth edition, ISO 15223-1:2021, is current and replaced the 2016 third edition. Amendment 1, published in 2025, updated the authorized representative term and made the EC REP symbol independent of country or region. Confirm which edition your target regulators recognize, since the FDA Recognized Consensus Standards database and the EU harmonized standards list update on their own schedules.
It depends on the market and the user. In the EU, because EN ISO 15223-1 is harmonized under the MDR, recognized symbols generally do not need explanation in the instructions for use. For devices intended for lay users, manufacturers should not assume comprehension; usability evidence may show that an explanation is still required to keep risk acceptable.
Related Terms
- EU MDR 2017/745
- ISO 13485
- ISO 14971
- Unique Device Identification (UDI)
- Instructions for Use (IFU)
