"recommended operation" is correct and usable in written English.
You can use it when you are recommending a specific action or procedure. For example: "The recommended operation for this patient is a laparoscopic cholecystectomy."
To assume the taking off task, the recommended operations are as follows.
For the very heaviest people, particularly those who eat compulsively, some surgeons recommend operations more extreme than the gastric bypass.
But when his doctor recommended an operation, the man refused, saying he was afraid of surgery.
An eye specialist recommended an operation to put plugs into ducts to help Sasha retain tears.
My mom, 93, recently received a diagnosis of colon cancer, and her doctors recommended an operation to remove the tumor.
He has recently suffered a succession of setbacks in his attempt to reach full fitness, prompting the Hammers' medical staff to seek the advice of independent specialists, who recommended an operation.
One of the team doctors recommended an operation, but Barber consulted a number of veterans, and many of them advised against it: surgery, they said, only begets more surgeries; better not to start so soon.
He immediately recommended an operation called a laminectomy to relieve the pressure on the nerve between my fourth and fifth vertebrae, which was being crushed and causing me severe pain, a condition called a lumbar stenosis.
Recommended normal operation region is located in height/diameter ratio of 13.5 15.0, load rate of 1.5 1.6 BV/h, load volume of 5.5 6.0 BV, total saponin concentration of 10.4 12.2 mg/g, wash volume of 2.0 2.6 BV when acceptable probability was set to 0.80.
