Is ASTM F2503 a mandatory standard?

While not always legally mandated, adherence to ASTM F2503 is strongly recommended and often expected by regulatory bodies like the FDA for devices intended for use in or near an MR environment. It serves as a critical tool for risk management and patient safety.

Where should these markings be placed?

ASTM F2503 specifies that these markings should be prominently displayed on the device itself, its labeling, packaging, and in relevant documentation, to ensure visibility and clarity for users.

Does ASTM F2503 cover all aspects of MR safety?

No, ASTM F2503 specifically addresses the marking of devices. Comprehensive MR safety also involves considerations for facility design, patient screening, and staff training, which are covered by other standards and guidelines.

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ASTM F2503

Standard practice for marking medical devices and other items for safety in the magnetic resonance environment.

Reviewed by Christian Espinosa, Founder, Blue Goat CyberLast reviewed September 19, 2026

Definition

ASTM F2503 defines the MR Safe (green square), MR Conditional (yellow triangle), and MR Unsafe (red circle) markings used on devices and accessories in MR-equipped facilities. MR Conditional devices must have labeling that describes the conditions for safe scanning, such as static magnetic field strength, spatial field gradient, RF exposure (specific absorption rate) and expected heating and image artifacts. Test methods are set out in related ASTM standards, such as F2052 (magnetically induced force), F2213 (torque), F2182 (RF heating) and F2119 (artifacts). FDA's guidance on MR safety labeling references ASTM F2503.

What the regulation says

ASTM F2503, Standard Practice for Marking Medical Devices and Other Items for Safety in the Magnetic Resonance (MR) Environment, provides a standardized system for labeling medical devices and other items to indicate their compatibility with the MR environment. This standard is recognized by regulatory bodies such as the FDA in their guidance documents concerning MR compatibility of medical devices.

What this means in practice

Required labeling element for any device that may enter or be used near MR scanners, including implants, monitoring equipment, and accessories.

Examples

A pacemaker is labeled 'MR Conditional' with specific conditions, including a maximum static magnetic field strength of 1.5 Tesla and a maximum spatial gradient field of 500 Gauss/cm.
A patient undergoing an MRI has a metallic joint implant, which is correctly identified as 'MR Conditional' based on its labeling, and the imaging protocol is adjusted accordingly.
A hospital purchases new infusion pumps that are clearly marked 'MR Safe,' allowing them to be used directly within the MRI scanner room without concern for magnetic interference.

Common pitfalls

•Misinterpreting 'MR Conditional' to mean a device is safe under all MR conditions, without considering the specific parameters and warnings outlined in the device's labeling.
•Failing to properly train personnel on the meaning of MR safety labels and the associated risks.
•Applying incorrect or unverified MR safety labels to devices, leading to potential harm to patients or damage to equipment.
•Not accounting for changes in a device's MR compatibility after repair or modification.

Frequently asked questions

The standard defines three primary classifications: MR Safe (green square), MR Conditional (yellow triangle), and MR Unsafe (red circle). These icons visually communicate the device's compatibility with magnetic resonance environments.

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Standard practice for marking medical devices and other items for safety in the magnetic resonance environment.

·Required labeling element for any device that may enter or be used near MR scanners, including implants, monitoring equipment, and accessories.
·Test methods are set out in related ASTM standards, such as F2052 (magnetically induced force), F2213 (torque), F2182 (RF heating) and F2119 (artifacts).

Remember this

Watch out: Misinterpreting 'MR Conditional' to mean a device is safe under all MR conditions, without considering the specific parameters and warnings outlined in the device's labeling.

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Labeling

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