The phrase "a mandatory approval" is correct and usable in written English.
It can be used in contexts where a certain approval is required by rules, regulations, or policies before proceeding with an action or decision.
Example: "Before we can move forward with the project, we need to obtain a mandatory approval from the regulatory board."
Alternatives: "required approval" or "compulsory approval".
Before adoption of HR-HPV RNAscope into clinical practice could be formally advocated, this test requires mandatory approval as an in vitro diagnostic device; however, the impending application and availability of HR-HPV RNAscope to a widely available automated staining platform (Ventana Medical Systems Inc).
Data from one study site (including 10 randomized patients) were removed from the analysis datasets, as inadvertently a centrally approved informed consent form was used without the additional mandatory approval of the site's local ethics committee.
A second run was allowed, on another time-bound licence, only after repeated appeals.Mr Kamardeen sent his newest script to the PPB for mandatory approval in November.
We obtained mandatory approval for the study from the Regional Ethical Review Board in Stockholm (ethical permit number 2010/1125-31/3, 2011/626-32).
Furthermore, this strategy brought the public partner back in the organisational internal decision process due to mandatory approval needed to perform any investment activity.
Dissatisfied, the applicant applied for a mandatory order for approval to be granted.
We were informed that it was not a mandatory requirement for ethics approval by the hospital ethics committee.
Group mean results are usually a mandatory requirement for regulatory approvals and, despite the limitations described here, are valuable in demonstrating that a therapy works in general.
In this regard, appropriate specifications of sample size grant internal validity to the study and must be a mandatory requisite for research projects approval.
