What is twilight anesthesia during a colonoscopy?

What is twilight anesthesia during a colonoscopy? Is that considered a virtual colonoscopy or do they do sedation during a normal colonoscopy as well?

Healthcare Providers (3)

Twilight anesthesia is sedation given during a colonoscopy to keep the patient comfortable during the procedure. Virtual colonoscopy is a CT scan that does not use sedation.

The term “twilight” is a layman’s expression for the term “conscious sedation,” a type of light sedation which is used during a standard colonoscopy. Virtual colonoscopy is the use of a high resolution CT scan to visualize the colon. Since it is non-invasive, sedation is not used during a Virtual Colonoscopy.

They do sedation during regular colonoscopy in the form of a ‘twilight’ sedation. This means a moderate sedative is given to make you sleepy, and to take away the anxiety and pain from the procedure – this type of anesthesia does not completely make you unconscious. Virtual colonoscopy refers to CT colonography which you can read more about on

No Physician-Patient Relationship
You understand and agree that use of the Website does not in any way create or establish a physician-patient privilege or physician-patient relationship between you and any Medical Professional Member. You should recognize that the information provided on the Website (including past questions and answers and articles posted on the site) is provided for your general information. These materials should not be relied on as medical advice and reading and reviewing them is not a substitute for direct consultation with a medical professional about a specific medical problem.

Without limiting the foregoing, you understand and agree that submitting a Free Question or receiving an answer to a Free Question does not in any way create or establish an physician-patient relationship between you and any Medical Professional Member, or between you and us. The information and answers provided in response to Free Questions is intended to be generic medical information, not medical advice, and is based upon the very limited information provided by you in a Free Question. Specific medical advice can only be given with full knowledge of all of the facts and circumstances of your situation. If you are currently being treated by a doctor, that doctor is the best person to give you advice about a medical case or medical matter. Under no circumstances should the information obtained on this site be used to make decisions about the quality of service provided by a doctor or about the proper course of a medical matter.