After your procedure, your doctor will have more information about the condition of your colon and lower digestive tract.
It is possible that everything is normal, and doesn't need any more treatment. If a problem was found during the colonoscopy, it may be treated. If it wasn't treated at that time, then you may need treatment later.
Your doctor will discuss these findings with you, as well as tell you what treatment plan may be best for you. If a biopsy or cytology are taken, the results will usually be back soon after your procedure. Having a biopsy or cytology taken does not mean that you have cancer. Biopsies are often done to look for other problems, like inflammation and polyps.
Colonoscopy has been done for many years, with good results. It is effective for finding problems with the lower digestive tract. However, it is possible that abnormal growths can be missed. This could be because the bowel prep was not done well, or because of the placement and size of the growth. This is one reason why it is very important to tell your health care provider about any symptoms you may have AFTER the colonoscopy.
You and your doctor can talk about the expected results in your particular situation. It is important that your expectations match your doctor's expectations.