I found info that supports what Lauren said and is more specific to Fairfax County.
http://www.fcag.org/gtfcps.html
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If a student's scores on the CogAT and Naglieri are not high enough for the student to be automatically screened, parents can refer the child for screening in second through seventh grades. The referral process for students in fourth through eighth grade requires at least one achievement score, in addition to the ability tests and other information described above. In recent years, about half the students referred for GT Center screening have been admitted to the GT Center program.

Any student who is screened for the GT Center and is rejected (i.e., "found ineligible") can appeal this decision, by submitting new information. Frequently, families who wish to appeal an adverse decision pay for their child to take an individual intelligence test, such as the WISC or Stanford-Binet.
P.S. You may also want to ask on the Fairfax County Association of Gifted Yahoo group
http://groups.yahoo.com/group/FCAG/

This is concerning:
http://www.fcag.org/index.html
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FCPS � Reevaluating GT Centers

In its June work session, the FCPS School Board will be reevaluating elementary and middle school GT Center programs. A majority of the School Board could decide that GT Centers are no longer necessary, given the availability of elementary school Level 4 classes and middle school honors classes. Interested parents should contact School Board members.

The School Board work session will be on June 8, 2009. The School Board forum will be on July 18, 2009.

Last edited by inky; 06/06/09 10:54 AM.