The phrase "usual protocol" is grammatically correct and commonly used in written English.
Example: It is customary for doctors to follow the usual protocol when diagnosing a patient.
Today, genuflecting to bishops is usually not a part of the usual protocol.
Following his usual protocol, Khiet proceeded to the site to determine how to dispose of the bomb.
This breaks the usual protocol for central government to pay for any new services it demands of local authorities.
In cases where no charges are pressed, the usual protocol is simply to announce that an investigation is closed.
In a change from its usual protocol, the normally secretive committee also announced that part of its inquiry would be held in public.
In a change from its usual protocol, the normally secretive committee announced that part of its inquiry would be held in public.
The White House made clear that the Chinese asked for consecutive translation, in contrast to the usual protocol at White House news conferences.
The tissue samples collected from adjacent region of tissue blocks were prepared as both FF and FFPE samples following the usual protocol in National Health Service diagnostic laboratories.
In addition to her usual protocol of instituting a routine and enforcing a bedtime, Ms. Frost brought in an expert to discuss Paige's language skills.
The usual protocol here at the Parent-Teacher Conference is that you ask me questions about parenting and education, and I answer in 800 words or fewer.
Certainly, Fischer often conforms to the usual protocol, and he foresees no surprises for the B.F.O.'s upcoming appearances at Lincoln Center, on June 1st and 2nd, at which he will lead symphonies of Dvořák.
