Coeliac Disease Testing London: Why You Should Not Go Gluten-Free First

Bloating after bread, stomach pains that come and go, tiredness that sleep does not fix, maybe a blood test years ago that showed anaemia and was never followed up. Coeliac disease affects around 1 in 100 people in the UK, and most people who have it do not know it yet. The testing is straightforward: a blood test first, and it only works if you are still eating gluten, which is why the order of events matters. An online GP can assess your symptoms, arrange the right blood tests and map out the next steps the same day. At The Online GP by The Wellness, consultations are with UK-registered doctors, seven days a week.

What is coeliac disease?

Coeliac disease is an autoimmune condition where the immune system reacts to gluten, a protein in wheat, barley and rye, and damages the lining of the small bowel. It is not an allergy or a food intolerance, and it is not a lifestyle choice. The bowel damage matters because it interferes with absorbing nutrients, which is why untreated coeliac disease can lead to anaemia, osteoporosis, fertility problems and other long-term complications. The treatment, a strict gluten-free diet, is highly effective, and the small bowel usually heals once gluten is removed.

Symptoms that suggest testing

The classic symptoms are digestive: bloating, diarrhoea, stomach pain, wind and weight loss. But many people, especially adults, have less obvious signs: persistent tiredness, iron-deficiency anaemia that does not respond properly to supplements, mouth ulcers, an itchy blistering rash on the elbows or knees, or simply a strong family history, because coeliac disease runs in families. First-degree relatives of someone with coeliac disease are generally advised to be tested, even without symptoms.

Why the order of testing matters

This is the single most useful thing to know before any test: the coeliac blood test looks for antibodies your body only makes when you are eating gluten. If you have already cut gluten out, the test can come back falsely negative, and you may be told you do not have coeliac disease when you do. Guidelines recommend eating gluten in more than one meal a day for at least six weeks before testing. If you have already gone gluten-free and feel better, do not restart without medical advice, because the reintroduction can be rough. Your doctor will talk you through the right sequence for your situation.

How an online GP can help today

With The Online GP by The Wellness, you can speak to a doctor the same day. Your doctor will take a careful history, review any previous blood tests, and arrange the right investigations: the coeliac antibody blood test (tTG-IgA with a total IgA level) plus checks for anaemia, vitamin D, B12, folate and ferritin, which are the common deficiencies. If the blood test is positive, the standard next step is a referral for a gastroenterology assessment to confirm the diagnosis before committing to a lifelong gluten-free diet. A phone consultation is £59 for 15 minutes, a video consultation is £150, and an in-person appointment at our Marylebone clinic is £220. Not sure whether testing fits your situation? Message us on WhatsApp for a free triage and we will point you to the right next step.

What happens after a diagnosis

If coeliac disease is confirmed, treatment is a strict gluten-free diet for life, and most people feel dramatically better within weeks. Good follow-up matters: a dietitian review, an annual check of bloods including antibody levels and nutrient status, and a bone density scan in some cases. Your doctor can also advise on the practical bits people actually ask about: eating out safely, cross-contamination at home, gluten-free prescriptions where eligible, and whether close family members should be tested.

What does coeliac testing cost?

With The Online GP by The Wellness, a phone consultation is £59 for 15 minutes, a video consultation is £150, and an in-person consultation is £220. Blood tests are priced separately and confirmed before anything is booked. Private walk-in clinics in London commonly charge £100 to £250 for the consultation alone before test costs.

Why choose The Online GP by The Wellness

Every consultation is with a UK-registered, GMC-registered doctor, not an automated questionnaire. Same-day appointments run seven days a week, blood test referrals are arranged promptly with results explained properly, and we handle the whole pathway: testing in the right order, specialist referral when needed, and the follow-up that keeps you well after diagnosis. You can also read about what an online GP can prescribe.

To arrange testing, call 020 3951 3429, email team@thewellnesslondon.com or book an appointment online.

Frequently asked questions

Can an online GP test for coeliac disease?

Yes. A doctor can assess your symptoms by phone or video, arrange the coeliac antibody blood test and related deficiency checks, and refer you for confirmation if the test is positive. The key is testing while you are still eating gluten.

Should I stop eating gluten before the blood test?

No. The test only works while you are eating gluten, usually in more than one meal a day for at least six weeks beforehand. If you have already cut gluten out, speak to a doctor before restarting, because reintroduction can cause strong symptoms.

What are the first signs of coeliac disease in adults?

Often not digestive at all: persistent tiredness, iron-deficiency anaemia, mouth ulcers, low mood, or an itchy blistering rash on the elbows or knees. Digestive symptoms such as bloating, diarrhoea and weight loss are common too, but their absence does not rule coeliac disease out.

Is coeliac disease the same as a gluten intolerance?

No. Coeliac disease is an autoimmune condition that damages the small bowel, with real long-term risks if untreated. Non-coeliac gluten sensitivity causes symptoms without that damage. The distinction matters, which is why proper testing comes before dietary changes.

Should my family be tested if I have coeliac disease?

First-degree relatives, meaning parents, siblings and children, are generally advised to be tested even without symptoms, because coeliac disease runs in families and is often silent. Your doctor can arrange this.

How much does a coeliac consultation cost in London?

At The Online GP by The Wellness, a phone consultation is £59 for 15 minutes, a video consultation is £150 and an in-person appointment is £220. Blood tests are priced separately and confirmed before booking.

This article is for information and does not replace personal medical advice. Written by The Wellness Team and medically reviewed by The Wellness Clinical Team. Last updated October 2026.