Observed Volume of Distribution of Absorbed Fraction for Unbound Drug

**Semantic type:** Quantitative Concept

**Definition:** The volume of distribution associated with the terminal slope following extravascular administration divided by the fraction of dose absorbed, calculated using the observed value of the last non-zero concentration and corrected for unbound drug.

**Synonyms:** - VZFOUB - Vz Obs by F for UB - Vz Obs by F for UB