"retain certification" is a correct and usable phrase in written English.
It can be used when referring to the process of keeping a certification active or current by meeting specific requirements. For example, "Continuing education is required to retain certification in the medical field."
Nearly every transportation mode has organizations that regulate operators through a series of licensing procedures, sanctions for inappropriate operating practices, and requirements for continuing training to retain certification to operate.
Abstractors were required to maintain this benchmark of 98% accuracy to retain certification.
Volunteers are required to complete a certain number of hours to become certified initially and normally a few amount of volunteer hours is required to retain certification.
"Whatever detail emerges from the independent panel, it's especially important that future plans retain Forest Stewardship Council certification and measures that guarantee good management, specifically for protecting habitats and biodiversity".
When a herd is certified as free yearly negative samplings of pigs susceptible to swine dysentery (20 40 kg body weight) are required to retain the certification [ 15].
You will need to pay $360 every two years to retain your certification.
Once certified, chartered accountants are monitored and supervised by their home institute, and must comply with all rules and standards established by these organizations to retain their certification.
Units handling nuclear weapons must pass NSIs every 18 months in order to retain their certifications.
That's apparently even true of Apple's glued-down MacBook Air batteries, so the company's ultraportable gets a pass and retains a certification that makes it much easier sell to government and NGOs who look to EPEAT compliance as a way of showing off a green-minded organizational ethos.
In the southern U.S. (hereafter, South), institutional forest owners engaged in forest certification programs often retain unharvested or less-intensively harvested vegetation when clearcut harvesting intensively managed pine (Pinus spp).
However, this is not necessary (on the contrary it creates extra overhead to each node) because every node retains a pairwise-certification relationship with the previous and next one in the path.
