CFR 990.27(a) Standards for Assessment Procedures
Any procedures used pursuant to this part must comply with all of the following standards if they are to be in accordance with this part:
(1) The procedure must be capable of providing assessment information of use in determining the type and scale of restoration appropriate for a particular injury;
(2) The additional cost of a more complex procedure must be reasonably related to the expected increase in the quantity and/or quality of relevant information provided by the more complex procedure; and
(3) The procedure must be reliable and valid for the particular incident.