This Celiac.com FAQ on celiac disease will guide you to all of the basic information you will need to know about the disease, its diagnosis, testing methods, a gluten-free diet, etc.
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What are the major symptoms of celiac disease?
Celiac Disease Symptoms
What testing is available for celiac disease? - list blood tests, endo with biopsy, genetic test and enterolab (not diagnostic)
Celiac Disease Screening
Interpretation of Celiac Disease Blood Test Results
Can I be tested even though I am eating gluten free?
How long must gluten be taken for the serological tests to be meaningful?
The Gluten-Free Diet 101 - A Beginner's Guide to Going Gluten-Free
Is celiac inherited? Should my children be tested?
Ten Facts About Celiac Disease Genetic Testing
Is there a link between celiac and other autoimmune diseases?
Celiac Disease Research: Associated Diseases and Disorders
Is there a list of gluten foods to avoid?
Unsafe Gluten-Free Food List (Unsafe Ingredients)
Is there a list of gluten free foods?
Safe Gluten-Free Food List (Safe Ingredients)
Gluten-Free Alcoholic Beverages
Distilled Spirits (Grain Alcohols) and Vinegar: Are they Gluten-Free?
Where does gluten hide?
Additional Things to Beware of to Maintain a 100% Gluten-Free Diet
Where can I buy gluten-free stuff?
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I am not sure where you got your statistics? It seems a bit misleading. Of course, if many people are tested, not all of them have Celiac. For example, my non-symptomatic kids get tested every few years and it is always negative.
I think the statistics to check are the tests accuracy. The current blood tests are quite accurate.
People with DH don't always have enough antibodies in the bloods to test positive (another statistic you could look up). But all the doctor has to do is properly test the DH rash to confirm Celiac.
I have checked statistics and over 80% of those tested for celiac come out negative, so it is a difficult thing to prove to begin with. My test came out negative too, but I know I have dermatitis herpetiformis, my doctor diagnosed me even without an official test. After I cut out gluten I felt like a totally new person, so to me that is proof enough. I just went with my instinct and cut it out anyway even tho nothing was 100% proven, and I feel So much better!