  The type-I seesaw Lagrangian yields a non-generic set of active-sterile
oscillation parameters - the neutrino mass eigenvalues and the physical
elements of the full mixing matrix are entwined. For this reason one is able
to, in principle, test the model by performing enough measurements which are
sensitive to neutrino masses and lepton mixing. We point out that for light
enough right-handed neutrino masses - less than 10 eV - next-generation
short-baseline neutrino oscillation experiments may be able to unambiguously
rule out (or "rule in") the low energy seesaw as the Lagrangian that describes
neutrino masses. These types of searches are already under consideration in
order to address the many anomalies from accelerator neutrino experiments
(LSND, MiniBooNe), reactor neutrino experiments (the "reactor anomaly") and
others. In order to test the low-energy seesaw, it is crucial to explore
different oscillation channels, including nu_e and nu_mu disappearance and
nu_mu to nu_tau appearance.
