In females, pre-procedural preparation involves smearing a small amount of barium contrast agent in the vagina, which will help to identify if anterior rectocele, enterocele or sigmoidocele is present. The technique itself involves the insertion of a caulk gun device into the rectum with a subsequent manual infusion of barium paste until there is adequate distension. The patient is then transferred to a portable plastic commode which is situated next to a fluoroscope which records the defecation. Positioning of the X-ray camera is of paramount importance as visualization of the buttocks, rectal vault, and lower pelvis is critical.
Defecography
Enteroscopy
GI cocktail
Capsule endoscopy
Sialoendoscopy
Fecal pH test
EGS 
Stool test