5 Endoscopic and Invasive Diagnostic Procedures

Preparing for the procedure

Preparation varies with the procedure. It may include bowel cleansing for colonoscopy, fasting when directed for sedation, and review of medical history, allergies, medications, bleeding risks, and pregnancy possibility when relevant.

For Colonoscopy, bowel preparation clears stool so the colon lining can be seen. Patients should follow the specific diet, prescribed laxative, and fasting instructions provided by the care team. They should review medications and supplements with the clinician and should not stop medication unless instructed.

Consent and pre-procedure checks

Informed consent is a discussion, not just a signature. The patient should understand the planned procedure and reasonably anticipated interventions, benefits, material risks, and alternatives—including the option of not proceeding—and have an opportunity to ask questions.

The responsible clinician obtains informed consent. The nurse follows facility policy for verifying and documenting it. If a patient does not understand a possible intervention, such as what may happen if a polyp is found, the patient should discuss the plan with the procedural clinician before proceeding.

Before sedation, the team also checks relevant history, allergies, medications, fasting status, and sedation risks.

Medication and bleeding considerations

Anticoagulants and some supplements can affect bleeding risk before an Image-guided biopsy. The procedural team decides whether and when medication should be adjusted based on the patient and procedure. Patients should not independently stop or restart prescribed medication, and should follow individualized instructions for medication restart after the procedure.

Recovery after sedation

After IV sedation, a patient may feel alert while judgment and reflexes remain impaired. The patient should have a responsible adult take them home and should avoid driving, operating machinery, and making important decisions for the rest of the day.

Patients should follow the facility's instructions about eating, drinking, activity, and when to resume medications, especially blood thinners. They should not assume that every medication can be restarted immediately.

Recognizing complications and seeking help

Mild throat soreness or bloating may occur after upper endoscopy. Severe chest or abdominal pain, fever, bleeding, difficulty swallowing, or black stools need urgent contact with the procedural team or medical evaluation. Complications such as perforation or bleeding are uncommon but can occur.

After an Image-guided biopsy, mild soreness or bruising can occur. Increasing swelling, significant bleeding, worsening pain, fever, redness, or drainage may indicate a complication and should be reported promptly. Follow procedure-specific instructions for dressing care and activity. If bleeding occurs, apply pressure as instructed and promptly contact the procedural team for assessment.

After a Lumbar puncture, a headache can occur and may worsen when sitting or standing and improve when lying down. Follow the clinician's aftercare advice and report a severe, persistent, or concerning headache. Fever, new weakness or numbness, or significant bleeding also requires prompt evaluation. Rest and positioning instructions vary, so follow the procedural team's guidance.

Understanding findings and results

Visual findings may be preliminary. If a polyp is removed during colonoscopy, the tissue is sent to a laboratory for examination by a pathologist. Many polyps are not cancer; pathology helps characterize the finding and determine whether follow-up is needed. Appearance alone does not always establish whether a polyp is cancer.

Results may take days or longer, so the patient should know how and when they will be communicated. A biopsy result is not necessarily available before the patient leaves recovery.