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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 May 5, 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.

    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.

    Primary references

    3 sources
    Link health: 3 verified· last checked 2026-05-09
    ASTM·1AAMI·1FDA·1
    1. 1
      ASTM F2503
      Verified
      ASTMastm.org
    2. 2
      AAMI Standards
      Verified
      AAMIaami.org
    3. 3
      FDA Recognized Consensus Standards
      Verified
      FDAaccessdata.fda.gov

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