The small intestine is a tubular structure within the abdominal cavity that carries the food in continuation with the stomach up to the colon from where the large intestine carries it to the rectum and out of the body via the anus.The main function of this organ is to aid in digestion.he small intestine is a tubular structure within the abdominal cavity that carries the food in continuation with the stomach up to the colon from where the large intestine carries it to the rectum and out of the body via the anus. The main function of this organ is to aid in digestion.
Report Abuse. 1  It depends on what the blood work is being drawn for. 2  Depending on the tests, he may need to fast for 12 hours before having the blood work done. 3  This depends on the lab work.  i have had a known practitioner say 10 hours and yet another known practitioner say 12 hours.
Some blood work requires no fasting at all. Some requires 12 hours and some 24 hours. If they didn't tell him how many hours, then I would assume he does not have to fast at all. I have never seen so many different answers in such a short amount of time. I want to add, drinking water DOES nothing for your blood work.