  We consider the threshold effect on the renormalization group (RG) evolution
of the neutrino masses and mixing angles in TeV scale seesaw models. We obtain
the analytic expressions using the factorization method in presence of
threshold effects. We also perform numerical study of RG effects in two
specific low scale seesaw models following the bottom-up approach and ascertain
the role of seesaw thresholds in altering the values of masses and mixing
angles during RG evolution.
