Thanks for the query to H.C.M. Forum.
As name indicates first test was to assess the condition of large intestine for colitis ( rectum,sigmoid colon
, anal canal
2nd test was for hepatitis
"C" , for any infection in liver.
3 RD test E G D was performed to find out any disease in Esophagus, stomach,duodenum ( esophagogastroduodenoscopy
Hope you have received required information.
If further any question I will help.
Get well soon.