All data within the OPTN database is collected via an online Web application called UNet^SM. Transplant professionals from hospitals, histocompatibility (tissue typing) laboratories, and organ procurement organizations located across the country use the application to perform the following tasks:

• manage their list of waiting transplant candidates
• access and complete electronic data collection forms
• add donor information and run donor-recipient matching lists
• access various transplant data reports and policies

The data collection forms comprise the largest percentage of the data collected in the system. The 26 different form types combined contain more than 3,500 data fields.