Moi University School of Medicine has cancelled the fourth year exams following claims of leakage.
The University Academic Board made the decision after a meeting on Thursday.
"No evidence of exam cheating has been found, but investigations are underway to establish the truth," a statement from the board reads.
The statement says all written exams were cancelled and rescheduled
to safeguard their integrity.
Medical students will sit the exams afresh between Thursday and December 14.
Dean of the School of Medicine Dr Lukoye Atwoli said the exams were cancelled and an exam cheating probe has begun.
"So far, we have established there was no actual cheating, but there were widespread claims on social media that undermined the integrity of the exams," he said.
He said the decision to cancel the exams was purely to protect the integrity of the exams but not a confirmation that there had been cheating.
Atwoli said students have begun repeating seven papers that were cancelled.
"There is no cause for alarm. The exams are now going on well," he said.
One student is reported to have circulated a leaked exam paper through Facebook.
Atwoli, however, termed the claims untrue.
Last week, students at the Annex Campus protested missing marks ahead of the university's 37th graduation ceremony on December 20.
At the same time, the police have arrested four suspects found printing fake certificates for the university.
Eldoret South police boss Wilson Abduba said police are hunting for at least 10 suspects linked to the scandal.
The suspects were caught printing degree certificates for Moi University and the University of Eldoret.
Moi University Vice Chancellor Prof Isaac Kosgey said the matter is being taken seriously.