The phrase "are supposed to undergo" is correct and usable in written English.
It can be used when indicating an expectation or requirement for someone or something to experience a particular process or change.
Example: "Students are supposed to undergo a series of assessments throughout the semester to evaluate their progress."
Alternatives: "are expected to experience" or "are meant to go through".
Two players from each team are supposed to undergo doping controls.
When competency is questioned, minors are supposed to undergo a treatment plan outlined by a psychologist.
After an initial assessment, individuals referred to WeCare are supposed to undergo a three-part "biopsychosocial assessment" to determine their ability to work.
The waste materials ingested by the earthworm are supposed to undergo bio-chemical changes leading to the mixing of plant nutrient and growth promoting substances in an assimilated form.
Under NFL rules, players who are suspected of having a concussion during games are supposed to undergo a sideline evaluation, and further tests can be administered in the locker room afterward.
These EMGs are of particular importance for SCNT embryos because they are supposed to undergo substantial reprogramming process for development.
In fact, the foreign national is supposed to undergo a background investigation before the marriage so that it does not impinge on the officer's career.
He developed pancreatitis, gall stones and a linked condition for which he was supposed to undergo an operation that never took place.
The Housing Authority's 3,335 elevators (in 2,636 buildings) are maintained and overseen by its 400 elevator mechanics, helpers, inspectors and supervisors, and each elevator is supposed to undergo maintenance on a monthly basis.
The priest, identified only with the initial "H," was moved to Munich in January 1980, where he was supposed to undergo therapy, a decision that was taken "with the approval of the archbishop," according to the archdiocese's statement.
The U.S. ITER project was supposed to undergo such a review, known as CD-2, last year.
