Since bioelectrical signals typically have amplitudes below μA and lower than mV, their measurement is significantly susceptible to environmental electromagnetic interference (EMI). In this study, we measured and analyzed the levels of electromagnetic interference in biolaboratory rooms – the birthplace and preliminary test center for any bioelectronic device. We have shown that in an ordinary biolaboratory, which is equipped with typical modern instruments, like digital microscopes, EMI in the sub-250 kHz range can include both periodic and wide-band signals, which can influence the working of impedance sensors and neuroprosthetic implants. The results of our study can be used for the development and testing of noise-suppression systems for bioelectronics applications.