Maxwell–Fricke equation

The Maxwell–Fricke equation relates the resistivity of blood to hematocrit. This relationship has been shown to hold for humans, and a variety on non-human warm-blooded species, including canines.

Equation

The Maxwell–Fricke equation is written as:

${\frac {{\frac {\rho _{1}}{\rho }}-1}{{\frac {\rho _{1}}{\rho }}+2}}=\varphi {\frac {{\frac {\rho _{1}}{\rho _{2}}}-1}{{\frac {\rho _{1}}{\rho _{2}}}+2}}$

where ρ is the resistivity of blood, ρ₁ is the resistivity of plasma, ρ₂ is the resistivity of blood cells and φ is the hematocrit.