The NIH mandated that UNC research its laboratory procedures on campus after People for the Ethical Treatment of Animals released a video in April showing UNC lab workers allegedly mistreating mice.
Nelson Garnett, director of the Office of Laboratory Animal Welfare at the NIH, verified that the agency received UNC's report Friday.
Although the report was originally due in August, the NIH postponed the deadline until Sept. 13 and then again until Friday.
Tony Waldrop, UNC's vice chancellor for research, said the University used the extra time to check facts and make sure that everything was correct.
He also said the report is about 43 or 44 pages in length, but he would not comment as to what information the report contained.
Garnett also declined to comment, citing an ongoing investigation.
Waldrop said the report will be available to the public as early as this week.
Officials must wait to release it until some of the names are blackened out out of concern for the privacy of those named in the report.
"Under the State Personnel Act, we're prohibited from releasing names in a report like this one," Waldrop said.