GRIDGlobal Registration Identifier for Donors (GRID)

In alignment with the World Marrow Donor Association (WMDA), the NMDP/Be The Match uses GRID as the donor identifier. Whenever possible, to copy and paste the GRID from a source of truth instead of risking error due to manual entry.

    What is GRID?

    The GRID standard is a 19-character identifier composed of three elements: 

    1. A 4-digit Issuing Organization Number (ION) – The National Marrow Donor Program® (NMDP) / Be The Match® ION is 3553
    2. A 13-character Registration Donor Identifier (RDI) assigned by the issuing organization  
    3. A 2-digit checksum – a calculated number that ensures the preceding 17 digits are accurate and not mistyped

    GRID numbers

      *other registries may have capitalized alpha characters in their GRID

      Assignment of GRIDs 

      NMDP / Be The Match assigns a GRID to all donors on the Be The Match Registry. 

      We will follow and promote the GRID Standard as published by ICCBBA and additional implementation details as provided by WMDA. See this ICCBBA webpage for details. 

      Systems & Sources of Truth for traceability and validation

      • AC/CCs: Donor Tracking Sheet
      • DCs: STAR Link Web
      • TCs: MatchSource®


      • • NMDP/Be The Match product labels utilize GRID as the identifier on the product.  
        • NMDP/Be The Match system-generated blood sample labels display GRID. Sample labels include verification/CT, IDM and donor workup/collection samples.


      Please check our GRID FAQ document above. You can use Ctrl+F to search for a keyword in the document.

      If you still have questions, please reach out to your Be The Match contact.