Differential privacy on medical data When we apply the differential privacy on medical data to protect the personal data of the patients, how the doctors can access the original data to analyze them and to intervene in real-time. In other words, the added noise to disturb the data, can be eliminated?
Differential privacy does not help to prevent disclosure of individual records when the user—the doctor, in this case—needs access to the individual records themselves.

Differential privacy is a property of a system for aggregating a collection of records into statistical queries on a data set so that the inclusion or exclusion of an individual record can't change the answers to the statistical queries much.  That way, the answers to the statistical queries—which might be published in a medical journal, or used to study trends—can't reveal much about individual patients.