You will need somebody to accompany you home and to stay with you for 24 hours until the effects have fully worn off. However, you should not drive, operate machinery, drink alcohol, take important decisions or sign documents for 24 hours after having the sedative. The sedative will normally make you feel quite pleasant and relaxed. If you have had a sedative - you may take a bit longer to be ready to go home. You may need to stay a bit longer for observation if you have had any small lumps of tissue (polyps) removed. Most people are ready to go home after resting for half an hour or so. The CT scan then produces images of the large bowel. A thin tube is put into the back passage to put air into the bowel to help produce clear images. This type of colonoscopy is performed using a CT scan to take an image of the bowel. There are technical reasons why it is difficult to do a colonoscopy.You have had a conventional colonoscopy and your doctor was not able to visualise the entire large bowel.It may be suggested as appropriate for you to have if: It is sometimes known as computerised tomography (CT) colonography or CT colonoscopy. A colonoscopy does not usually hurt but it can be a little uncomfortable, particularly when the colonoscope is first passed into the anus.Ī newer type of colonoscopy called a virtual colonoscopy is available. However, you should allow at least two hours for the whole appointment to prepare, give time for the sedative to work, for the colonoscopy itself and to recover. (Polyps are small lumps of tissue which hang from the inside lining of the colon.) At the end of the procedure the colonoscope is gently pulled out.Ī colonoscopy usually takes about 20-30 minutes. Also, it is possible to remove polyps, which may be found, with an instrument attached to a colonoscope. The biopsy samples are sent to the laboratory for testing and to be looked at under the microscope. The operator may take small samples (biopsies) of some parts of the inside lining of the colon - depending on why the test is done. This is normal and there is no need to be embarrassed, as the operator will expect this to happen. The air may also make you feel bloated, cause some mild 'wind pains', and may cause you to pass wind. This may cause you to feel as if you want to go to the toilet (although there will be no stools (faeces) to pass). Also, modern colonoscopes transmit pictures through a camera attachment on to a TV monitor for the operator to look at.Īir is passed down a channel in the colonoscope into the colon to make the inside lining easier to see. The operator can look down the colonoscope and inspect the lining of the colon. The operator will gently push the end of the colonoscope into your back passage (anus) and up into the colon. The sedative can make you drowsy but it does not put you to sleep. This is usually given by an injection into a vein in the back of your hand. You will usually be given a sedative to help you to relax. It is a routine test which is commonly done. For example, the operator may take a small sample (biopsy) from the inside lining of the colon by using a thin 'grabbing' instrument which is passed down a side channel.Ĭolonoscopy is usually done as an outpatient or day case. These can be manipulated by the operator. The colonoscope also has a side channel down which devices can pass. The colonoscope contains fibre-optic channels which allow light to shine down so the operator can see inside your colon. See the separate leaflet called Sigmoidoscopy for more details. Another test called sigmoidoscopy looks at the rectum and the lower part of the colon. It can be pushed all the way round the colon as far as the caecum (where the small and large intestine meet). It is passed through the anus and into the colon. The last part of the colon leads into the rectum where stools (faeces) are stored before being passed out from the back passage (anus).Ī colonoscope is a thin, flexible telescope. The colon is the part of the gut which comes after the small intestine. The colon is sometimes called the large intestine or large bowel. A colonoscopy is a test where an operator - a doctor or nurse - looks into your colon.
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