  The leading order hadronic contribution to the muon magnetic moment anomaly,
$a^{HAD}_\mu$, is determined entirely in the framework of QCD. The result in
the light-quark sector, in units of $10^{-10}$, is $a^{HAD}_\mu|_{uds} =686 \pm
26$, and in the heavy-quark sector $a^{HAD}_\mu|_{c} =14.4 \pm 0.1$, and
$a^{HAD}_\mu|_{b} =0.29 \pm 0.01$, resulting in $a^{HAD}_\mu = 701 \pm 26$. The
main uncertainty is due to the current lattice QCD value of the first and
second derivative of the electromagnetic current correlator at the origin.
Expected improvement in the precision of these derivatives may render this
approach the most accurate and trustworthy determination of the leading order
$a^{HAD}_\mu$.
