UNetSM is the electronic platform designed, built, continuously updated and maintained by UNOS over the course of 30 years for fulfilling requirements of the OPTN contract. UNetSM is a centralized computer network that links all 58 OPOs, 254 transplant hospitals and 150 histocompatibility labs. Thousands of transplant professionals access this secure web-based transplant platform each day to list patients for transplant, match patients with available donor organs and submit required OPTN data. UNOS developed UNetSM to enable members to submit, store, manage and display OPTN data using a secure, efficient, reliable and web accessible platform. The UNetSM platform includes:


With WaitlistSM, transplant hospitals are able to manage information about their patients in need of transplant. WaitlistSM uses a series of complex algorithms to calculate a patient’s medical urgency and predicted transplant benefit.


DonorNet® provides OPOs the ability to add and modify donor data, execute match runs, make electronic organ offers and supplement the donor record with related medical information and source documents. Transplant hospitals view posted donor information and record organ acceptance and refusal decisions on all organ offers.

DonorNet MobileSM

DonorNet MobileSM provides OPOs the ability to perform second verification of donor ABOs and upload attachments to the donor record. Transplant centers have the ability to view and respond to their organ offers. The secure application can be accessed from any mobile device. 


UNet Application Programming Interfaces (API) allow OPTN data about donors, candidates and recipients to be transmitted to or from the UNetSM system from a validated Electronic Health Record system (EHR) securely and seamlessly.

Learn how UNetSM APIs can increase efficiency


TIEDI® enables OPTN members to access and complete donor, candidate, and recipient-specific electronic data-collection records.


TransNetSM provides OPOs the ability to create electronic labels for packaging and labeling all deceased donor organs for transplant or research. Transplant centers are able to perform organ check in and electronically match the organ to the recipient.

Learn more about TransNetSM

Access UNetSM

Enter data about candidates, recipients and donors here:

Access UNetSM

System changes

Find changes to UNetSM (also called system notices) here.

Updates to security administration site will launch December 10

Audience: UNet security administrators All UNet users At-a-glance Anyone at a transplant center, OPO, or lab who uses UNet must first be granted access by their security administrator. To make it easier for UNet Security Administrators to review and update UNet...

KPD system priority points updated

We plan to make changes to the KPD system to improve the way it prioritizes candidate-donor matches, especially for hard-to-match pairs.

Median MELD and PELD at transplant scores updated

As of Sept. 24, 2019, updated median MELD at transplant (MMaT) and median PELD at transplant (MPaT) scores are being used as a basis for assigning exception scores for liver transplant candidates.

Relisting a K-P candidate as a KI Candidate

If you remove a KP candidate and relist them as KI, your KP record must contain Isolated KI acceptance criteria or your new KI listing must have an inactive status.

New TIEDI® APIs now available

TIEDI® APIs now available for Transplant Recipient Registration(TRR), Immunosuppression at Registration(IMR), and Transplant Candidate Registration(TCR) Implementation date: September 11, 2019 Audience All UNetSM Please share this notice with anyone in your...

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