FGFR3 and juvenile Huntington disease: Examples of targeted genetic testing include single or limited panel of genes for a specific disorder, such as FGFR3 genotyping for achondroplasia, karyotype for suspected Trisomy 21, repeat expansion testing of HTT for Huntington’s disease, panels for non-syndromic retinitis pigmentosa or hypertrophic cardiomyopathy.