Member login 
Coeliac New Zealand Logo

Do you need help with diagnosis and treatment?

Coeliac Tests and Getting Diagnosed

blank
A medical diagnosis of coeliac disease is key to managing and improving your health. If you suspect you have coeliac disease, it is important to first talk to your doctor. It can take some time before symptoms are identified as being caused by coeliac disease as not all people have typical symptoms. Indeed, some people have minimal or no symptoms. Because the presentation of coeliac disease is so variable, many people remain unaware that they have the disease. When talking with your doctor, it’s important to mention all symptoms you’ve noticed. Remember also to mention if a relative has coeliac disease or dermatitis herpertiformis, or if you or a family member has been treated for anaemia. People with a first-degree relative with coeliac disease (parent, child or sibling) have a 1 in 10 risk of also developing the disease. This will give your doctor the best information and help in planning the best tests to work out if you do have coeliac disease. Making a definitive and correct diagnosis is essential to ensure that you receive the correct treatment and management and enable access to benefits such as the Pharmac part-subsidy.  

Coeliac Disease Tests Used in Diganosis

blank
Blood tests
Blood tests, or coeliac serology, measure specific antibody levels in the blood. These are typically elevated in people with untreated coeliac disease. They can be used to screen for coeliac disease, but a diagnosis should not be made on the basis of a single blood test alone. In children who have typical symptoms and who fit certain criteria, it is possible to make a diagnosis of coeliac disease without doing a small bowel biopsy if two separate blood samples show highly positive coeliac markers. However, this way of diagnosing coeliac disease without a small bowel biopsy is only able to be considered after discussion with a paediatric gastroenterologist. Other blood tests (such as blood count and iron studies) may also be helpful in working out when someone needs further tests for possible coeliac disease. These tests look at nutrients that might be low in someone with coeliac disease due to the damage in the gut interrupting normal absorption
Duodenal (Small Bowel) Biopsy This testing involves a gastroscopy (scope procedure) in which several tiny samples (biopsies) of the small bowel are taken under direct vision through the scope. An endoscopy takes less 10 minutes and is usually conducted as a day procedure under sedation.  Children would typically have this procedure conducted during a light general anaesthetic. Once processed, the biopsies are then examined with a microscope for the presence of changes consistent with coeliac disease, including damage to the surface of the bowel (for example, villous atrophy).
Gene tests
Coeliac disease is associated with specific genetic markers known as HLA DQ2 and HLA DQ8, which can be tested for on a blood test. Almost everyone with coeliac disease will have one or other of these markers. However, at least half (if not more) of people in New Zealand will have a positive gene test – most of these people will never develop coeliac disease. Gene testing can be a very helpful test to do when the diagnosis is uncertain, because a negative test more-or-less rules out coeliac disease. However, a positive HLA test is not enough to confirm that a person has coeliac disease due to the widespread presence of the gene in the community.  

Staying on a normal gluten-containing diet

blank
Remain on a Gluten-containing diet
It is vital to continue eating gluten (not excluding gluten-containing foods) until the diagnosis of coeliac disease is confirmed (which for most people will be after the scope test). Reducing or excluding gluten prior to doing antibody blood tests, or especially prior to endoscopy and small bowel biopsy, will likely affect the results and delay or obscure the correct diagnosis. While the results of the gene testing will not be affected by being on a gluten-free diet, this testing is not often helpful in making a diagnosis (as detailed above). When someone has already been on a gluten-free diet for some time without a definitive diagnosis a gluten challenge would then be required to establish the diagnosis. A gluten challenge involves the consumption of gluten-containing foods (at a minimum of 4 slices of wheat-based bread or equivalent) daily for 4-8 weeks prior to testing (2 slices daily for children for a month). Following this period of time, blood tests and/or a small bowel biopsy would then be undertaken. A gluten challenge should only be conducted after a discussion with your doctor and planned in a coordinated and consistent fashion to ensure optimal outcomes.                  
blank

Kids Can Become Members Too! 

blank
  • They will receive advice, support, recipes and more throughout their coeliac journey
  • Become part of a lively and supportive community
  • Receive updates from medical professionals, manufacturers, and researchers
  • Gain access to our member only resources, support groups, kids’ clubs, special offers, and the Coeliac Link magazine
Member Plans

Already Diagnosed - What Next?

blank

You are not alone! Get support, further your knowledge and understanding, and learn to live a full life by becoming a member of Coeliac New Zealand. The organisation is made up of people of all ages who have had similar experiences to you.

Tell your doctor about our Health Professional Memberships

Coeliac New Zealand is here to support health professionals with information and resources as they guide patients through their coeliac disease diagnosis and assist them in managing their gluten free diet. Health professionals are able to join as a paid members and can connect with our Medical Advisory Panel by emailing admin@coeliac.org.nz

You can tell your doctor about these memberships by passing on our downloadable Health Professional flyers:

Health Professional Membership - Private Sector

Get Involved

blank

Support your charity – the only not-for-profit supporting Kiwis with coeliac disease. Become part of Coeliac New Zealand now.

Volunteer

blank

Volunteering is a great way to grow your community and share your knowledge with others.
Find out how.

Get in Touch

Donate

Help us reach more people who are suffering from coeliac disease. Contribute to the greater good of your community.

Make a Donation

Partner with us

blank

Create a corporate partnership with us. If you wish to support CNZ in any capacity, please contact us today to enquire on how we can work together.

Get in Touch

About Coeliac New Zealand

blank

Your partner in
healthy living

Coeliac New Zealand is available throughout your journey. As part of our community, you’ll get support, advice, and assistance. We work with health professionals, manufacturers, and researchers to raise awareness of coeliac disease in NZ.

Together, we can reach a day when every person with coeliac disease gets diagnosed quickly, lives a healthy life, and has the prospect of a cure.

LATEST NEWS

blank
30/09/2024
Fibre - the often overlooked but vital nutrient blank

Over the next few months, Suzanne Atkin our dietitian is putting together a series of nutrition articles focusing on important and often deficient nutrients. The next in our nutrient series is the often overlooked but vital nutrient – fibre.  Fibre Fibre is a type of carbohydrate found only in plant products.   It does not provide […]

Read More
16/08/2024
Know your nutrients blank

Over the next few months, Suzanne Atkin our dietitian is putting together a series of nutrition articles focusing on important and often deficient nutrients.  We start our series this month by talking about the mineral - Iron. What is iron and why do I need it? Iron is a mineral found in several proteins and […]

Read More
31/07/2024
Callout for Favourite Member Recipes blank

For Coeliac Awareness Week 2024, Coeliac NZ volunteer Ingrid Karsten asked fellow Waikato members to share their favourite gluten-free recipes. Ingrid received so many amazing recipes that she had the idea to start compiling a “Virtual Recipe Book” of members' gluten-free recipes. She would love to hear from members all over the country to create […]

Read More
linkedin facebook pinterest youtube rss twitter instagram facebook-blank rss-blank linkedin-blank pinterest youtube twitter instagram