The severity of the transit problem is quantifiable by the transit test and the result may be an important variable; it may facilitate the decision on further diagnostic procedures, it effects the choice of therapy and long-term prognosis.
Total transit time (OATT, mouth-to-anus)*: Indicates if colonic transit time is DELAYED, NORMAL or RAPID
Segmental transit time**: Provides information on the type of the delay, i.e. distal or left-sided
Segmental transit time is of interest to evaluate, particularly in patients with delayed transit, because it gives an indication which segment is abnormal; is the function defective in the recto-sigmoid area or is it more widespread in the left colon, or even affecting all parts of colon such as in colonic inertia.