The Tehran University of Medical Sciences alumni website features a searchable database.
Go to the alumni database to verify whether the student is registered as an alumni.
To verify, locate the student number (شماره دانشجویی) on the transcript, and plug it into the student number search field (fourth from the top).
You can also search by name, start year, course period, university branch, faculty, degree level, and field of study.
Note that the database requires student registration. If a student isn't listed in the database, they may not have registered as an alumni.