  In this review, we aim to introduce the reader to the technique of electrical
impedance spectroscopy (EIS) with a focus on its biological and medical
applications. We explain the theoretical and experimental aspects of the EIS
with the details essential for biological studies, i.e interaction of metal
electrodes with biological matter and liquids, strategies of increasing
measurement rate and noise reduction in bio-EIS experiments, etc. We give
various examples of successful bio-EIS practical implementations in science and
technology: from the whole-body health monitoring and sensors for vision
prosthetic care to single living cell examination platforms and virus diseases
research. Present review can be used as a bio-EIS tutorial for students as well
as a handbook for scientists and engineers due to extensive references covering
the contemporary research papers in the field.
