CDKL5 and Menkes disease: If we were to subtract the cost of every single gene test from C1's cost analysis (cost for batten screen, CDKL5, SCN1A gene sequencing, Rett gene sequencing, ATP7A for Menkes disease, and X-linked mental retardation-sequencing of a panel of 7 genes), the excess cost would have still been $13,055.