 This paper proposes a novel physical model for optimizing the use of an interdigitated sensor for bio-impedance spectroscopy. The model incorporates both theoretical and experimental approaches, including the use of Coventureware registered software to simulate the sensor's electrical impedance in three dimensions, as well as a finite element method, FEM, to study the effects of various geometric parameters on the sensor's performance. The results of this study demonstrate that the sensor can be optimized prior to its actual implementation, allowing for more accurate measurements of the biological medium of interest. This article was authored by Ibrahim M, Kledel J, Kortish D, and others.