Hi Maria - sorry I didn't get back to you about this yet. You may want to look at some of the single subject studies that have been conducted that use a rubric-based dependent measure. There are a couple in the JLD synthesis. You can find more of those studies in the following syntheses:
Wanzek, J., Wexler, J., Vaughn, S., & Ciullo, S. (2010). Reading interventions for struggling readers in the upper elementary grades: A synthesis of 20 years of research. Reading and writing, 23(8), 889-912.
Edmonds, M. S., Vaughn, S., Wexler, J., Reutebuch, C., Cable, A., Tackett, K. K., & Schnakenberg, J. W. (2009). A synthesis of reading interventions and effects on reading comprehension outcomes for older struggling readers. Review of Educational Research, 79(1), 262-300.
Reading difficulties can be overcome with use of recorded instructions, lectures and books, as well as reader services and digital page scanners with speech ability to read back the scanned pages
Referrals
Ensure the assessment is completed by a professional experienced in dealing with the age group in which the client falls.
Psychologists who have worked extensively with children with learning disabilities may have very limited experience working with adults with learning disabilities
As Krishnan mentioned, technology is definitely being used more frequently to support struggling readers. Scientific Learning Corporation might be one of several tech-based interventions to explore and direct an inquiry regarding rubrics. They offer "progress reports" for those assisting readers with their products. Also, I'm certain that all students undergo the usual testing within their schools on a continuum. Best wishes on your journey.