A review is presented of advances and challenges in fully integrated systems for personalised medicine applications. One key issue for the commercialisation of such systems is the disposability of the assay-substrate at a low cost. This work adds a new dimension to the integrated circuits technology for lab-on-a-chip systems by employing 3D integration for improved performance and functionality. It is proposed that a disposable biosensing layer can be aligned and temporarily attached to the 3D CMOS stack by the vertical interconnections, and can be replaced after each measurement.