Early challenges in smart blood glucose monitor adoption—such as weak biological signal capture, electromagnetic interference (EMI), and insufficient human body electrical isolation—have been overcome by specialized PCB assembly technologies, particularly rigid-flex PCBs and high-precision surface mount technology (SMT). These innovations effectively enhance the sensitivity of analog front-ends for capturing faint blood glucose biochemical electrical signals, while integrating EMI shielding layers to eliminate interference from surrounding household and medical electronic equipment. Rigid-flex PCBs, in particular, balance ultra-compact form factors with reliable signal transmission, supporting the miniaturization of handheld and portable blood glucose detection devices without compromising testing accuracy. This technological leap has enabled smart blood glucose monitor PCB assemblies to outperform traditional detection circuits in key areas: