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Colonoscopy with Sigmoidoscopy (Probe-Based Visualization of the Lower Digestive Tract)

Published: August 9, 2026Updated: August 16, 2026

This procedure involves examining the inner lining of your colon and rectum using a flexible tube with a light and camera (sigmoidoscope) to check for abnormalities like polyps, inflammation, or signs of disease.

Quick summary

["A diagnostic tool to assess your digestive health and detect potential issues early."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
67223-8
Short code
Reasons had colon sigmoidoscopy PhenX
Synonyms
Reasons had colon sigmoidoscopy PhenX
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
phenx
CPT
82784
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What to Expect Before the Procedure

You’ll likely need to prepare by following a clear-liquid diet and possibly taking laxatives a day before. Your doctor may also prescribe a bowel-cleansing solution to ensure a clear view of your colon. You may receive sedation to help you relax during the procedure.

During the Procedure

A doctor inserts the sigmoidoscope through your rectum, allowing them to visualize the lower colon. They may take small tissue samples (biopsies) or remove polyps if found. The procedure usually takes 15–60 minutes and is done in a hospital or outpatient setting.

Aftercare and Recovery

You’ll rest for a short time afterward, often in a recovery area where staff monitor your vital signs. Bowel movements may be more frequent or loose for a day or two, but this is normal. Follow your doctor’s instructions for pain management and diet.

Why This Test Might Be Ordered

Your doctor may recommend a sigmoidoscopy to investigate symptoms like persistent diarrhea, rectal bleeding, unexplained weight loss, or abnormal test results (e.g., blood in stool). It’s also used as a screening tool for conditions like colorectal cancer or inflammatory bowel disease.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Frequently asked questions

How long will I need to prepare for this test?
Preparation typically involves a bowel-cleansing regimen, often starting the day before. Follow your healthcare provider’s specific instructions, as timing varies based on your medical history and preparation method.
Will I feel pain during the procedure?
Most people experience mild discomfort or pressure, but sedation helps minimize pain. You may feel some cramping or bloating afterward, but this usually subsides quickly.
Can I eat or drink before the procedure?
You’ll need to avoid solid foods and liquids (except water in some cases) for several hours before the test. Check with your doctor for exact dietary restrictions based on your preparation plan.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy