Back in the XIXth century, tens of thousands of people rushed to California to find gold and become rich. Most of them did not succeed, but those who did, really did (especially the companies owning the mines). Something similar happens with diagnostic kits nowadays. The trend is towards more personalised medicine, either at the diagnosis step, or at the therapeutical step. Newly marketed drugs include companion diagnostics, development of new diagnostics is increasing, and the need for accurate results is more important than ever. One size does not fit all.