The measurements of R-b = sigma (e(+)e(-) --> b (b) over bar)/sigma (e(+)e(
-) --> q (q) over bar) at centre-of-mass energies above the Z pole using da
ta collected by the LEP experiments from 1995 to 1999 are summarised. The m
easurements are performed using b-tagging methods that exploit the relative
ly large decay length of b hadrons. A preliminary combination of the Rb mea
surements is also presented.