National Institute of diabetes and Digestive and Kidney Diseases (N I D D K) of the National Institutes of Health (N I H) - Your Digestive System and How It Works:
http://www.niddk.nih.gov/health/digest/pubs/digesyst/newdiges.htm

The endoscopy Center of Pensacola, FL contains lectures by their gastroenterologists, gastro links, patient education links and brochures. They will soon be adding videos of endoscopies and colonoscopies:
http://www.endo-world.com/

North American Society of Pediatric Gastroenterology and Nutrition, better known as NASPGN:
http://www.naspgn.org/

Nutramed (Stephen J. Gislason, M.D.) has a comprehensive Web site:
http://www.nutramed.com/

Don Wiss has created a very comprehensive collection of sites for those who want to know more about IBS:
http://www.panix.com/~ibs/

Here is another site on IBS:
http://www.ibsgroup.org/

Crohns & colitis Web Page:
http://www.ccfa.org/

Celiac Disease and Food Allergy Screening Laboratories:

Enterolab
https://www.enterolab.com/Home.htm

IMMCO Diagnostics, Inc.
http://www.immco.com

Genova Diagnostics (GSDL):
http://www.gdx.net/home/assessments/celiac/

Specialty Labs
http://www.specialtylabs.com

The Great Plains Laboratory:
http://www.greatplainslaboratory.com/home.htm

Immuno Laboratories:
http://www.immunolabs.com

Meridian Valley Laboratory:
http://www.meridianvalleylab.com/allergy_dept.html

Sage Medical Laboratory
http://www.foodallergytest.com

US BioTek
http://www.usbiotek.com

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