actress , who underwent a double mastectomy in 2013 , was referring to a genetic test that currently costs more than $ 3,000 -lrb- £ 2,000 -rrb- .
now a silicon valley-based start-up is offering an at-home dna saliva test that detects the same gene mutations but is priced at only $ 249 -lrb- £ 167 -rrb- .