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:
ρ 1 ρ − 1 ρ 1 ρ + 2 = φ ρ 1 ρ 2 − 1 ρ 1 ρ 2 + 2 {\displaystyle {\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.
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