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Hemodialysis: Dialysis process in which undesired metabolites and toxic by-products, such as urea and creatinine, are removed from blood.

Hemofiltration: Ultrafiltration process in which undesired metabolites and toxic by-products, such as urea and creatine, are removed from blood.

Heterogeneous membrane: Membrane consisting of two or more components that differ by chemical or phase composition.

Hindered transport: Combined partition, diffusion and convection process in which the effective partition, diffusion and viscous drag coefficients in a restricted environment depend upon the ratio of the effective radius of the penetrant molecule to that of the pore.

Hollow fiber membrane: Membrane formed from hollow fibers with selective layer on outer or inner surface of the fiber.

Homogeneous membrane: Membrane with essentially the same structural and transport properties throughout its thickness.

Hybrid membrane; Mixed matrix membrane: Membrane that is formed of organic and inorganic components, e.g. of nano-size inorganic particles dispersed in organic (polymeric) matrix.

Hydrophilic membrane: Membrane manufactured from hydrophilic or hydrophilizated material or having the surface made from such material.

Hydrophobic membrane: Membrane manufactured from hydrophobic or hydrophobizated material or having the surface made from such material.