This measurement defines the capacity of a porous material to transmit fluids. Darcy's law is an equation that describes the flow of a fluid through a porous medium. The calculation in biological systems relies on a pressure gradient, the thickness of the material through which the fluid is proceeding, and the dynamic viscosity of the filtration solution.
free water clearance level to body weight ratio
free water reabsorption level to body weight ratio
glomerular filtration rate +
glomerular sieving coefficient for albumin
proximal tubule albumin uptake to tubule area ratio