In pharmacology,<unk>  is used to describe the fraction of an administered dose of unchanged drug that reaches the systemic circulation, one of the principal pharmacokinetic properties of drugs. By definition, when a medication is administered intravenously, its<unk>  is 100%. However, when a medication is administered via other routes (such as orally), its<unk>  decreases (due to incomplete absorption and first-pass metabolism).<unk>  is one of the essential tools in pharmacokinetics, as<unk>  must be considered when calculating dosages for non-intravenous routes of administration.
Bioavailability
Fluency
Chemical polarity
Chemical affinity
Half-life
Saturation 
Concentration
Image resolution