top of page


The Global Registration Identifier for Donors (GRID) serves as a globally unique identifier for hematopoietic progenitor cell (HPC) donors and potential donors. The GRID Checksum Calculator can be used to calculate the checksum portion of the GRID based on the Issuing Organization Number (ION) and Registration Donor Identifier (RDI) elements. The program will display the full GRID (ION + RDI + checksum). This program can also be used as an auditing tool to verify an existing GRID.

Intended Audience:
This tool is intended for organizations that will assign or receive a Global Registration Identifier for Donors (GRID). Download the tool below (Version 1.0 xlsx 29kB):

Your feedback is greatly appreciated and will help us to improve our ability to serve you and other users of our programs and tools.​​

  • If you would like to provide some feedback or make a suggestion about how we can improve our service, please email us.

    • If you are experiencing issues with the program, please contact us.

For information on the structure of the Global Registration Identifier for Donors (GRID) and the Issuing Organization Number (ION), see ST-015 Standard Global Registration Identifier for Donors: ION Database and GRID Rules

bottom of page