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Avera Medical Group Gastroenterology

Plaza 1
1417 S. Cliff Avenue, Suite 300
Sioux Falls, SD 57105
Phone: 605-322-8630
Toll Free: 888-956-4800
Fax: 605-322-8631

Colonoscopy prep

Proper colon prep is important in order to gain a full and clear view of the entire lining of the colon. Since colonoscopies take place every 10 years, make the most of this screening opportunity. Thoroughly cleansing the colon the night before the test is imperative.

High-volume preps are the standard because a high volume of liquid needs to be ingested in order to purge the bowel. You have the option of drinking cleansing solutions that are two liters in volume or two cups in volume. If unable to tolerate the cleansing solutions, you may take laxatives – approximately 32 pills.

The gastroenterologist will explain how to make the cleansing solutions in the right proportions, and when to start taking the prep. Failure to thoroughly purge the colon may result in having to reschedule the colonoscopy.

Endoscopy facilities

Avera Digestive Disease Institute, working in conjunction with Avera Gastroenterology, facilitates two distinct settings for endoscopy care and screenings. Learn more about how these endoscopy suites use state-of-the-art technology and comfortable surroundings to provide patient-focused care.

Screening for colorectal cancer and polyps

Average Risk

Average Risk

  • Start screening at age 50 (if African American, screen at age 45
  • Colonoscopy (preferred approach) every 10 years OR
  • FOBT annually OR
  • Flexible sigmoidoscopy every 5 years OR
  • FOBT annually AND flexible sigmoidoscopy every 5 years OR
  • Air contrast barium enema every 5 to 10 years

Family History Risk

Family History Risk

  • Start screening at age 40, or 10 years prior to age of when youngest affected family member was diagnosed
  • Colonoscopy (preferred approach) every 10 years OR
  • Air contrast barium enema every 5 to 10 years

Heredity Non-polyosis Colorectal Cancer Risk

Heredity Non-polyosis Colorectal Cancer (HNPCC) Risk

  • Start screening at age 21
  • Colonoscopy every 1 to 3 years AND
  • Genetic counseling

Familial Adenomatous Polyosis Risk

Familial Adenomatous Polyosis (FAP) Risk

  • Start screening during puberty
  • Colonoscopy every 1 o 2 years AND
  • Genetic counseling AND
  • Consider genetic testing

Ulcerative Colitis Risk

Ulcerative Colitis Risk

  • Start screening 7 to 8 years after pancolitis diagnosis; 12 to 15 years after left-sided colitis diagnosis
  • Colonoscopy with biopsies for dysplasia every 1 to 2 years


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