Each public agency shall obtain informed parental consent prior to conducting any reevaluation of a student with a disability, except that such informed parent consent need not be obtained if the local educational agency can demonstrate that it had taken reasonable measures to obtain such consent and the student’s parent has failed to respond. [34 CFR §300.505(a)].
In this context, "reevaluation" means any evaluation conducted for the student after the initial evaluation. This may include evaluations to consider additional programs and services, such as speech and language or occupational therapy.