I use the terminology the same way. I tend to refer to individuals with scores over 145 as HG or PG depending on the context.

This is Dr. Ruf's revised (for Wisc IV and SB 5) levels of giftedness.

Level One 117-129 MG
Level Two 125-135 HG
Level Three 130-140 EG
Level Four 135-141 EG to PG
Level Five 141+ EG to PG

She also adds a note that the current tests cannot adequately distinguish between EG and PG.