Food Intolerance
Expert blood collection,
available at home or in clinic
* Phlebotomist blood draw included
* UK accredited lab
* Results in days
Why take this test?
If you want to understand what foods might be affecting how you feel every day
If you’re dealing with ongoing bloating, low energy, headaches, or just don’t feel your best — and can’t quite figure out why — your diet could be playing a bigger role than you realise.
Food intolerances aren’t always obvious. Reactions can be delayed and subtle, making it hard to pinpoint the cause. This test gives you a broader view of how your body responds to different foods, helping you identify potential triggers and take control of your wellbeing with confidence.
What does it test?
IgG antibodies
Upgrade to a more comprehensive test.
Get a deeper, more detailed analysis or your liver health.
View Comprehensive TestBloating, Fatigue, or Brain Fog After Meals?
Food Intolerance Blood Test – Starter, Advanced, or Comprehensive to Uncover Triggers
Tired of unexplained bloating, sluggishness, or flare-ups that ruin your day?
Food intolerances – delayed immune reactions to everyday eats – can mimic IBS, allergies, or “just bad luck,” leaving you foggy, tired, and frustrated without answers. Unlike immediate allergies, symptoms like cramps, low mood, or skin issues hit hours/days later, hard to trace. Our at-home Food Intolerance Blood Tests measure IgG antibodies to common foods, spotting sensitivities so you can eliminate triggers and reclaim energy.
Food Intolerance Blood Test
If you often feel bloated, tired, foggy-headed, or notice skin breakouts after meals, it might not just be coincidence. These could be signs of a food intolerance.
Unlike food allergies—which cause immediate and often severe reactions—food intolerances typically involve a delayed immune response.
This means symptoms can appear several hours, or even days, after eating a trigger food, making it difficult to identify the cause without proper testing.
Food intolerance can affect everyone differently. For some, it leads to uncomfortable digestive issues like gas, cramps, or irregular bowel movements. Others may experience low mood, lack of focus, or constant fatigue that seems to have no clear explanation. Skin concerns like eczema, acne, or general inflammation are also common signs that the body may be reacting to certain foods.
Our food intolerance blood test is designed to uncover these hidden sensitivities by measuring IgG antibody levels—an immune marker that may increase when your body reacts to specific foods. We test your response to a broad panel of everyday ingredients, including dairy, grains, vegetables, fruits, nuts, seeds, legumes, fish, and meat.
With your personalised results, you’ll be able to see which foods may be contributing to your symptoms. This empowers you to make targeted changes to your diet—whether that means cutting out certain foods temporarily, following an elimination diet, or working with a nutritionist to rebalance your meals.
Stop guessing and start understanding what your body is trying to tell you. With the right information, you can take real steps toward feeling clearer, lighter, and more energised every day.
A Professional Comes to You
Once you order your test and book your appointment, a qualified professional can visit your home or workplace, or you can choose to visit a clinic to take your blood sample safely and comfortably.
- No self Testing
- Accredited UK lab
Food Intolerance Advanced Blood Test
Expanded IgG to 34+ foods (builds on Starter with onion, orange, banana, oat, buckwheat, cabbage, rice, cheese (cheddar), salmon, chicken meat, corn (maize), crab, tuna, garlic, white bean, mustard). Deeper for moderate issues. (IgG to broader everyday eats like fruits, grains, fish, meats.)
- Best For: Ongoing digestive/mood/skin problems; when basics don’t explain (e.g., fruit/seafood reactions).
How often should I have a Food Intolerance Blood Test?
Most people only need a Food Intolerance Blood Test once—unless symptoms change.
It’s a smart way to get clarity and adjust your diet confidently.
Can I Use These Results With My GP?
Your results report is designed to be shared with your GP or specialist. It shows your intolerances clearly so you can discuss whether any further tests, treatment, or follow‑up are needed.
Nurse Appointments Fill Up Fast — Book Now To Secure Your Preferred Date.
Our Nurses visit your Home or Work to take your blood.
Pick a time and date to suit you.
Your results are available online within days of your blood being taken.
Other Questions
- Frequent bloating or stomach discomfort
- Excess gas, cramps, or indigestion
- Constipation or diarrhoea
- Feeling tired or sluggish after meals
- Persistent fatigue or low energy throughout the day
- Brain fog, poor concentration, or forgetfulness
- Headaches or migraines with no clear cause
- Skin issues like acne, rashes, or eczema
- Joint pain or general inflammation
- Mood swings, irritability, or low mood
- Almond
- Onion
- Apple
- Orange
- Banana
- Oat
- Buckwheat
- Peach
- Cabbage
- Peanut
- Carrot
- Potato
- Celery
- Rice
- Casein
- Rye flour
- Cheese (cheddar)
- Salmon
- Cod fish
- Sesame seed
- Chicken meat
- Shrimp
- Corn (maize)
- Soya bean
- Crab
- Tomato
- Egg white
- Tuna
- Egg yolk
- Walnut
- Hazelnut
- Wheat
- Garlic
- White Bean
- Milk
- Mustard
Take the blood test as early as possible if you experience bloating, fatigue, brain fog, or skin flare-ups after eating.
Collection method: Venous blood
Results available: 1-2 days after the sample has reached the laboratory.
IgG as a Biomarker
IgG (Immunoglobulin G) is an antibody that signals your immune system has been exposed to certain foods.
In food intolerance testing, raised IgG levels may suggest your body is reacting to those foods, potentially causing delayed symptoms like bloating, fatigue, or skin issues.
While not a diagnosis on its own, IgG is a helpful marker for identifying possible food sensitivities when reviewed alongside your symptoms and dietary habits.
The Hidden Culprits in Your Diet – Why Food Intolerances Are Sabotaging Your Health
Your immune system flags certain foods with IgG antibodies – a delayed response causing inflammation over time. Common triggers (dairy, wheat, eggs) build up, leading to bloating, gas, cramps, constipation/diarrhoea, fatigue, brain fog, headaches/migraines, skin issues (acne/eczema/rashes), mood swings/irritability, joint pain, or low energy – often misdiagnosed as stress, IBS, or “ageing.”
The misery? Symptoms linger, disrupting meals, workouts, or focus – years of trial-and-error diets without relief. Risks rise with gut conditions, stress, or poor absorption; untreated, it worsens inflammation or nutrient gaps. If you’re veggie/vegan, on meds, or have family sensitivities, test now – IgG reveals patterns for targeted elimination, not restriction.
Stop the cycle – identify, remove, and thrive.
Food Intolerance Signs Stacking Up? When to Test
These delayed reactions hit anyone – spot if they fit:
- Persistent bloating, gas, cramps, or irregular bowels after eating?
- Fatigue/low energy, brain fog, headaches, or poor concentration?
- Skin flare-ups (acne/rashes/eczema), mood changes, or joint stiffness?
- Unexplained weight issues, low mood/irritability, or slow healing?
- Triggers: Restrictive diets, long-term gut concerns, or desire for personalised guidance?
Common in UK (processed foods/stress), but reversible.
Our customers transform:
“Comprehensive pinpointed my wheat – no more daily bloating!” – Sophie K., Bristol.
Conquer Food Intolerances – Simple Plan After Results
IgG insights + symptoms guide an elimination diet (remove suspects 2-4 weeks, reintroduce one-by-one):
- Diet Tweaks: Swap triggers (e.g., dairy-free alternatives, gluten-free grains); focus anti-inflammatory foods (fish, berries).
- Support Steps: Hydrate, probiotics for gut health, track symptoms in a journal.
- Professional Help: Nutritionist/GP for plans; retest if symptoms shift (most once is enough).
- Lifestyle: Stress reduction (yoga), balanced meals to avoid new sensitivities.
Unsure? 70% start with Starter – upgrade if results miss triggers or if you want a deeper dive
(e.g., Advanced for fruits/nuts, Comprehensive for everything). All UK-accredited labs, confidential.
Ease Your Worries – Testing Made Simple
- Basic or Full? Starter for suspects; Advanced/Comprehensive for thoroughness (e.g., if gut/mood chronic).
- Reliable? Venous samples + labs give precise IgG; indicator, not diagnosis – pair with symptoms/GP.
- Diet Changes Daunting? Results include guidance; most see relief in weeks with pro help.
- Privacy/Repeat? Confidential; one-time for most, retest if life changes (e.g., new diet).
Feel lighter – identify your triggers today.
How it Works
Read about Fingerprick VS Venous blood sample 
1. Order a Test
Order your test, and then Answer the Questions about why you’re taking that test.
You’re then given instructions on calling the team to book a date and time for a nurse, so they can take your blood sample at your home, workplace or clinic.
Our nurse will then send your sample to our laboratory.
2. Our laboratory team run the tests
Our skilled laboratory staff conduct your blood tests in a clean and secure environment, ensuring accuracy and reliability.
Each test follows strict protocols to maintain the highest quality standards.
3. Receive Your Results within 7 days
We will email you to inform you that your blood test results are ready.
The email will have a PDF report attached, sent directly to your inbox.
4. Monitor your levels over time
With regular ongoing tests and reports, you can track your results. The reports can be shared with your GP.
Check if you’re improving healthily or where changes could be made.
