A theory is developed for estimation of a population value of AUC along wit
h its standard deviation, in ther case, when only one concentration-time (C
-t) sample is available for each individual. This theory is based on model-
independent pharmacokinetics. Integration methods are classified due to the
ir applicability to the presented approach. The main goal of this work is t
o establish a statistical hypothesis-testing procedure which would make sin
gle C-t samples usable for bio-equivalence studies. An application of the t
heory to a number of integration methods currently in use is analyzed in de
tail. A real data illustration is included.