Data and Sample Requests

There are two ways to access data and samples from the DCCT/EDIC study. One is via the NIDDK Central Repository, which has data and samples through 2017 available for distribution. The second is to apply to collaborate with the EDIC study. Using the resources below, investigators should first evaluate whether the data and biological specimens required for the research can be provided by the NIDDK Central Repository, and if so, the application for access to that material should be submitted to the Repository, not to the EDIC study. However, if the research requires access to data and/or biological materials that are not available in the NIDDK Central Repository, the investigator can submit an application to the EDIC study using the processes described below. 


Accessing data and samples via the NIDDK Central Repository


Collaborating with the EDIC Study

All collaborators should agree to the EDIC Publications and Presentations Policy and the Ancillary Studies Policies that are outlined in the documents below.


Feasibility Statement*

Prospective investigators should be aware that there is a finite quantity of specimens in both the EDIC Central Biochemistry Laboratory (CBL) and the NIDDK Central Repository, and some samples may have been depleted or may have very low volumes. Therefore, a sample of subjects with available specimens may be a biased representation of the DCCT/EDIC cohort. Availability of adequate numbers of subjects with available specimens will be a criteria on which the Research Review Committee (RRC) will base their evaluations of a new proposal. 

Characteristics and Complications for Those Who Agreed or Refused to Send Samples to the Repository


*Potential collaborators may require information to allow them to best evaluate the possibilities for collaborations with EDIC or to plan the design (e.g. sample size) for a study. Investigators who would like to obtain specific numbers of cases of specific outcomes that have occurred during EDIC should contact Dr. Barbara Braffett at


Please contact the EDIC Coordinating Center for more information or for proposal submissions.