Unlabeled fluoroimmunoassay with a europium chelate is described. The
recommended method is simple because the complicated labeling process
is omitted. The recovery of some samples ranges from 91 to 111%. The r
elative standard deviation of the method is less than 10%. The detecti
on limit is about 10(-10) mol liter(-1) antigen. (C) 1997 Academic Pre
ss.