Endoscopy is a term to cover the different procedures they do. A gastroscopy is via the mouth, a colonoscopy via the rectum.

They usually need to take small biopsies (about the size of a pin head) of the area for an accurate diagnosis. These results can take 1-2 weeks to come back. Some endoscopists (the dr doing the procedure) will make a preliminary diagnosis without these results.

Most drs will speak to you very briefly after to let you know what they think but don't be concerned of they don't.