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Free fraction

Pharmacokinetics parameter From Wikipedia, the free encyclopedia

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The free fraction is a parameter in pharmacokinetics and receptor-ligand kinetics. One speaks of two different free fractions:

  • Plasma free fraction, previously referred to as ƒ1,[1] is now referred to as ƒP according to consensus nomenclature.[2]
  • Tissue free fractionND), previously referred to as ƒ2[1]

The plasma free fraction is the fraction of the ligand at equilibrium in blood plasma that is not bound to plasma proteins.

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