 The other thing you can do is you can pass a tube nasally and see if you get a lot of regurgitated and reflux fluid to see what's going on with the colic, or you can assess response to treatment. Colic is generally considered a lot more severe if you try to give some light sedation and some pain medication and the horse doesn't respond. Then that would be a much more severe colic, and that might lead you in one direction. A rectal can be super helpful, and this is one of those reasons why it's really important