  We compare recent MINERvA antineutrino-hydrogen charged-current measurements
to phenomenological predictions of the axial-vector form factor based on fits
to all available electron scattering and deuterium bubble-chamber data and to
representative lattice-QCD (LQCD) determination by the PNDME Collaboration.
While there is $1$--$2\sigma$ agreement in the cross section with MINERvA data
for each bin in $Q^2$, we identify three regions with different relevance and
opportunity for LQCD predictions. For $Q^2 \lesssim 0.2~\mathrm{GeV}^2$, the
phenomenological extractions have large number of data points and LQCD is
competitive, while MINERvA data have large errors. For $0.2~\mathrm{GeV}^2
\lesssim Q^2 \lesssim 1~\mathrm{GeV}^2$, LQCD is competitive with the MINERvA
determination, and both give values larger than from phenomenological
extraction. For $Q^2 > 1~\mathrm{GeV}^2$, the MINERvA data are the most
precise. Our analysis indicates that with improving precision of MINERvA-like
experiments and LQCD data, the uncertainty in the nucleon axial-vector form
factor will be steadily reduced.
