  We performed a systematic study of 12 active regions (ARs) with a broad range
of areas, magnetic flux and associated solar activity in order to determine
whether there are upflows present at the AR boundaries and if these upflows
exist, whether there is a high speed asymmetric blue wing component present in
the upflows. To identify the presence and locations of the AR upflows we derive
relative Doppler velocity maps by fitting a Gaussian function to {\it
Hinode}/EIS Fe XII 192.394\,\AA\ line profiles. To determine whether there is a
high speed asymmetric component present in the AR upflows we fit a double
Gaussian function to the Fe XII 192.394\,\AA\ mean spectrum that is computed in
a region of interest situated in the AR upflows. Upflows are observed at both
the east and west boundaries of all ARs in our sample with average upflow
velocities ranging between -5 to -26~km s$^{-1}$. A blue wing asymmetry is
present in every line profile. The intensity ratio between the minor high speed
asymmetric Gaussian component compared to the main component is relatively
small for the majority of regions however, in a minority of cases (8/30) the
ratios are large and range between 20 to 56~\%. These results suggest that
upflows and the high speed asymmetric blue wing component are a common feature
of all ARs.
