The Label Is Part of the Device, Not a Sticker at the End

Under the Federal Food, Drug, and Cosmetic Act, a device with deficient labeling is misbranded, and a misbranded device cannot legally be sold no matter how well it works. That is the whole reason labeling deserves engineering attention: it is a compliance surface with the same enforcement teeth as the hardware, and a meaningful share of device recalls are labeling-only events.

It is also a design constraint. Required content occupies physical area, has minimum legibility requirements, and has to survive sterilization and the device's service life. Discover in week 40 that a UDI barcode needs 0.6 in (15 mm) of flat surface you did not leave, and you are opening a mold.

What FDA Requires on the Label

The core requirements sit in 21 CFR Part 801. On the label and packaging you need:

  • Name and place of business of the manufacturer, packer, or distributor.
  • Statement of identity — the common or usual name of the device.
  • Quantity of contents where applicable.
  • Adequate directions for use, or the prescription-device exemption statement ("Caution: Federal law restricts this device to sale by or on the order of a physician" or the Rx Only symbol) when the device is prescription-only and full directions travel in the IFU.
  • Lot or serial number for traceability.
  • UDI in both human-readable text and AIDC (barcode or RFID) form.
  • Expiration date where the device degrades, plus storage conditions.
  • Sterility statement and method for sterile devices, and "Do not use if package is damaged."
  • Single-use indication where applicable.
  • Any device-specific warnings required by a special control or a classification regulation.

Everything here has to be consistent with your cleared indications. Labeling that implies a use outside what was cleared is off-label promotion, and it is one of the fastest ways to draw a warning letter. Keep the indications statement identical to the submission text; the place for accessible plain-language guidance is the instructions for use, written to the process described in usability engineering for medical devices.

UDI: The Device's Digital Identity

The Unique Device Identification system requires most devices to carry a UDI on the label and package, and implantable, life-supporting, or life-sustaining devices along with the Class III tier to carry it directly on the device as a permanent marking. A UDI has two parts: a device identifier (DI), which is static per model and version, and a production identifier (PI), which carries lot, serial number, manufacturing date, or expiration date as applicable.

You obtain the DI from an FDA-accredited issuing agency (GS1, HIBCC, or ICCBBA), then submit a record for every version or model to the Global Unique Device Identification Database. GUDID submission is a data project in its own right, with dozens of attributes per record and an obligation to keep them current when anything changes. Plan for someone to own it.

Two practical traps. First, a change that creates a new version or model requires a new DI, so a mid-life material change can cascade into new artwork, new barcodes, and a new database record. Second, direct part marking has to survive reprocessing, so laser marking or electrochemical etching is usually the only viable method, and it needs to be scannable after hundreds of reprocessing cycles, which quietly rules out several marking methods and surface finishes.

Symbols: The Language of ISO 15223

Symbols save space and cross languages, and FDA accepts standalone symbols from recognized standards without accompanying text, provided you include a symbols glossary in the labeling. The workhorse set comes from ISO 15223-1: manufacturer, date of manufacture, use-by date, batch code, catalog number, serial number, sterile and sterilization method, do not reuse, consult instructions for use, temperature limits, and the CE-market authorized representative and importer symbols.

Do not invent symbols. A non-standard pictogram has no defined meaning, tests badly with users, and can be read as a claim. If you need to communicate something the standard does not cover, use words.

If You Also Sell Into Europe

EU requirements overlap but are not identical. CE marking, the EU importer and authorized representative details, Basic UDI-DI, EUDAMED registration, and translation into the official languages of each market where the device is sold all apply, and the medical device regulation is stricter about consistency between the label, the IFU, and the technical documentation. The scope is laid out in EU MDR explained. Design one artwork system that can carry both sets of content rather than maintaining two divergent families, because divergence is where errors breed.

The Label Has to Survive the Device

Labeling durability is a testable engineering requirement, and FDA reviewers ask about it. Run the label through the actual product lifecycle: the sterilization cycle you have chosen, whether ethylene oxide, gamma, or steam per your sterilization method; the cleaning agents named in your reprocessing instructions; abrasion; and accelerated aging matched to your shelf-life claim.

Practical rules that come out of that testing: thermal transfer printing beats direct thermal, which fades; polyester and polyimide label stock outperform paper; adhesive selection depends on the substrate energy, so a label that sticks to polycarbonate may lift off polypropylene; and any label crossing a curved surface or a parting line will eventually peel from the edge. Barcode contrast and quiet zones must still pass a verifier grade after aging, not just when fresh. Where a label cannot survive, move to laser marking or molded-in text, and make the space for it before tooling is cut. Physical constraints like this belong in the artwork brief the same way they would in any product packaging design program.

Control It Like a Drawing

Label artwork is a controlled document. Each label and each IFU gets a part number, a revision, an approval record, and a place in the device master record, with obsolete versions removed from the floor so a stale roll cannot be applied. Reconcile printed label counts against production counts, verify barcodes on a sample from every print run, and route any change through the same change control as a hardware revision. All of it lands in the design history file, and an inspector will look for it there.

Start the label content list at design input, alongside the requirements document, and give someone explicit ownership of artwork, UDI, and GUDID. Labeling failures are cheap to prevent and expensive to recall.

Get the Labeling Package Right

Projects House builds device labeling packages, from content requirements and symbol selection through artwork, UDI assignment, GUDID submission, and durability testing. Send your device type, markets, and sterilization method through our contact form and we will map what your label has to carry.