OG? and botox


My partner just had a call to go to hosptal in 2 week for an OG and botox, does anyone know what an OG is?  (he didnt ask)

He has had the botox already, im wondering is it just another dilation although they did say he may have to stay in this time which is strange as he has had 5 dilations already.

They are going to look at his stomach as he has been vomiting every day but still holding all the weight he gained after treatments ended in September 22.

Thanks x