Food Intolerance & Other Tests

What foods cause allergies and sensitivity

Naturopathy Clinic LogoI offer the Fitzwilliam FoodTEST food intolerance Test. This measures the IgG antibody levels associated with specific foods. There is a significant amount of published references indicating an association between elevated levels of IgG and many health issues (see Digestive Issues below). The Fitzwilliam FoodTEST Clinic, has been involved with food intolerance testing since 1983, and having worked with nearly every test which is available, holds that this IgG pinprick test is the most reliable and most useful diagnostic test currently available. I am delighted to be able to offer you this test.

The test only requires a pinprick drop of blood which is then sent to the Cambridge Nutritional Sciences laboratory. The tiny sample can be collected in the comfort of your own home or I can take it from you at the clinic. Collecting the drop of blood is very simple—similar to a diabetic pinprick blood glucose test). Results are back in 2 weeks.

The big advantage with the new IgG food intolerance test is that it is able to pinpoint those one or two primary culprit foods and your exact level of intolerance. This simplifies the whole approach to treating food intolerance associated illness.

Note: It is important to eat a broad range of foods before taking the test. Do not eat any food which has already caused a severe reaction without first getting a medical opinion.

Digestive Issues

  • Irritable Bowel Syndrome
  • Migraine/ Headache
  • Obesity
  • Rheumatoid Arthritis
  • Skin Disease
  • Infertility
  • Respiratory Symptoms
  • Autism
  • ADHD

60 Food Test


Dairy & Eggs:Egg White, Egg Yolk, Milk (Cow’s), Milk (Goat’s)

Grains:Barley, Corn (Maize), Durum Wheat, Gluten, Oat, Rice, Rye, Wheat

Meats:Beef, Chicken, Lamb, Pork, Turkey, Venison

Fish & Seafood:Cod, Crab, Haddock, Lobster, Oyster, Plaice, Salmon, Shrimp/Prawn, Trout, Tuna

Vegetables:Bean (Red Kidney), Bean (White Haricot), Broccoli, Brussel Sprout, Cabbage (Savoy/White), Carrot, Cauliflower, Pea, Potato, Soya Bean

Fruit:Apple, Avocado, Blackberry, Cherry, Grape, Grapefruit, Lemon, Lime, Orange, Pear, Pineapple, Raspberry, Strawberry

Nuts & Seeds:Almond, Brazil Nut, Cashew Nut, Hazelnut, Peanut, Pistachio

Herbs/Spices:Chilli (Red), Garlic, Ginger, Mustard Seed, Peppercorn

Miscellaneous:Mushroom, Yeast (Baker’s), Yeast (Brewer’s)

93 Food Test

Cost = €255

Grains: Barley, Buckwheat, Corn, Durum Wheat, Gliadin, Millet, Oat, Rice, Rye, Wheat

Dairy: Cow’s Milk, Egg White, Egg Yolk, Goat Milk, Sheep’s Milk

Meats: Beef, Chicken, Lamb, Pork, Turkey, Venison

Fish: Lobster, Cod, Crab, Herring, Mackerel, Mussel, Plaice, Prawn, Salmon, Sole, Haddock, Tuna

Vegetables: Aubergine, Avocado, Beetroot, Broccoli, Cabbage, Carrot, Cauliflower, Bean (Red Kidney), Celery, Cucumber, Haricot Bean, Leek, Lentil, Lettuce, Onion, Pea, Peppers, Potato, Soya Bean, String Bean, Sunflower Seeds, Tomato, Chilli Pepper

Fruit: Apple, Raspberry, Banana, Blackcurrant, Grape, Grapefruit, Kiwi Fruit, Lemon, Melon, Olive, Orange, Peach, Pear, Pineapple, Blackberry, Strawberry.

Nuts: Almond, Brazil Nut, Cashew Nut, Coconut, Hazelnut, Peanut, Walnut.

Herbs/Spices: Garlic, Ginger, Nutmeg, Pepper, Sesame Seeds.

Other: Vanilla, Carob, Cocoa Bean, Coffee, Mushroom, Rapeseed, Tea, Yeast (Bakers/Brewers)

200 Food Test- Cost €340

Dairy & Eggs:Alpha-Lactalbumin, Beta-Lactoglobulin, Casein, Egg White, Egg Yolk, Milk (Buffalo), Milk (Cow’s), Milk (Goat’s), Milk (Sheep’s)

Grains:Amaranth, Barley, Buckwheat, Corn (Maize), Couscous, Durum Wheat, Gliadin, Malt, Millet, Oat, Rice, Rye, Spelt, Tapioca, Wheat, Wheat Bran(Maize)

Fish & Seafood:Anchovy, Bass, Carp, Caviar, Clam, Cockle, Cod, Crab, Cuttlefish, Eel, Haddock, Hake, Herring, Lobster, Mackerel, Monkfish, Mussel, Octopus, Oyster, Perch, Pike, Plaice, Salmon, Sardine, Scallop, Sea Bream, Shrimp/Prawn, Sole, Squid, Swordfish, Trout, Tuna, Turbot

Meats:Beef, Chicken, Duck, Horse, Lamb, Ostrich, Ox, Partridge, Pork, Quail, Rabbit, Turkey, Veal, Venison, Wild Boar

Vegetables:Artichoke, Asparagus, Aubergine, Bean (Broad), Bean (Green), Bean (Red Kidney), Bean (Haricot), Beetroot, Broccoli, Brussel Sprout, Cabbage , Red), Cabbage (Savoy/White), Caper, Carrot, Cauliflower, Celery, Chard, Chickpea, Chicory, Cucumber, Fennel, Leek, Lentil, Lettuce, Marrow, Onion, Pea, Peppers, Potato, Quinoa, Radish, Rocket, Shallot, Soya Bean, Spinach, Squash, Sweet Potato, Tomato, Turnip, Watercress, Yuca

Fruit:Apple, Apricot, Avocado, Banana, Blackberry, Blackcurrant, Blueberry, Cherry, , Cranberry, Date, Fig, Grape, Grapefruit, Guava, Kiwi, Lemon, Lime, Lychee, Mango, Melon, Mulberry, Nectarine, Olive, Orange, Papaya, Peach, Pear, Pineapple, Plum, Pomegranate, Raisin, Raspberry, Redcurrant, Rhubarb, Strawberry, Tangerine, Watermelon

Nuts & Seeds:Almond, Brazil Nut, Cashew Nut, Coconut, Flax Seed, Hazelnut, Macadamia Nut, Peanut, Pine Nut, Pistachio, Rapeseed, Sesame Seed, Sunflower Seed, Walnut

Herbs & Spices:Aniseed, Basil, Bayleaf, Camomile, Cayenne, Chilli (Red), Cinnamon, Clove, Coriander, Cumin, Curry (Mixed Spices), Dill, Garlic, Ginger, Ginkgo, Ginseng, Hops, Liquorice, Marjoram, Mint, Mustard Seed, Nettle, Nutmeg, Parsley, Peppercorn, Peppermint, Rosemary, Saffron, Sage, Tarragon, Thyme, Vanilla

Miscellaneous:Cane Sugar, Carob, Chestnut, Cocoa Bean, Coffee, Honey, Mushroom, Tea (Black), Tea (Green), Transglutaminase, Yeast (Baker’s), Yeast (Brewer’s)


Your blood sample is sent to the laboratory, it is analysed using specially designed test plates which have small wells on the surface. Foods considered most likely to cause a food intolerance response are cultured in these wells, and the patient’s blood is spread across the plate. If the blood contains antibodies which are antagonistic to a particular food, they will attach themselves to the inside of that well. A special coloured dye is then added which binds with the attached test antibodies on the plate. The deeper the resulting colour, the greater the amount of food-specific antibody present in any particular test plate well. By using sophisticated instrumentation which can interpret the depth of colour, it is possible to measure the precise antibody level, in other words, exactly how intolerant you are.

What is happening in the body with food intolerance?

Food intolerance is primarily caused by a spasm of the stomach and intestines. The digestive system is unable to digest food when it is caught in such a spasm. It is like a clenched fist which is unable to relax. We do not always know this is happening.  This results in undigested foods arriving in the intestines. It is these undigested foods which ultimately become the intolerance foods. These undigested foods begin to interact with the normal intestinal bacteria and the end result is the production of many harmful toxins. These toxins eventually begin to seep into the blood stream and are carried throughout the body. These foreign invaders are challenged by the immune system and eliminated.

If we carry on eating our intolerance foods the immune system is challenged continuously, twenty four hours a day, seven days a week and eventually becomes fractious and irritable and this causes it to over-react.  This results in the immune system being activated by innocuous triggers such as house dust, pollen, paint fumes, etc. If this chronic irritation of the immune system is allowed to continue it eventually begins to attack its own tissues leading to arthritis, sinusitis, irritable bowel and all other such auto immune diseases. The objective of the food intolerance test is to find the foods which are causing this toxic state.


Vitamin D Testing for Deficiency

Vitamin D deficiency can be a serious problem and does not have very obvious symptoms. It increases susceptibility to other more serious conditions. Maintaining Vitamin D levels protects the body from a wide range of diseases including viruses, cardiovascular disease and bone disease including osteoporosis. Depression and breast, prostate and colon cancer have also been linked to an increased risk of Vitamin D deficiency.

Cause of Vitamin D Deficiency

The long Irish winter and the lack of sunlight is perhaps the biggest cause of Vitamin D deficiency amongst people living in Ireland. That’s why we should be more concerned then most countries.

Vitamin D Test  €65

Which Foods Contain Vitamin D

Only a few foods naturally contain Vitamin D therefore adequate levels are dependent on exposure to sunlight. Fish such as salmon, tuna and mackerel are among the best sources.

The Test

All that is required is a small fingerprick sample of blood for the laboratory to measure your Vitamin D levels

Candida Albicans Test €90

Candida Albicans is a yeast-like fungus that is normally present on the skin and on mucous membranes such as the vagina, mouth, or rectum. An overgrowth of Candida in these areas is commonly referred to as thrush. It is also a normal inhabitant of the human gut, however, when a person has a microbial imbalance, Candida Albicans can change its form to become a pathogenic (injurious) invasive fungus.

The test is designed to detect elevated levels of IgM and IgG antibodies to Candida Albicans. Elevated IgM results indicate an early stage infection. Elevated IgG results indicate an actively ongoing infection or the occurrence of a past infection.

Presenting Symptoms Include:

  • Headaches
  • Fatigue or low energy
  • Abdominal bloating
  • Excessive flatulence
  • Bladder / kidney infections
  • Fungal infections of nail or skin
  • White coating on tongue
  • Mood swings
  • Depression
  • Increased sensitivity to allergy and intolerance

What Causes Candida Albicans:

Factors which encourage Candida overgrowth include overuse of antibiotics, oral contraceptives, steroid drugs, consumption of high sugar or high yeast content drinks and continuous intake of poorly digested foods (food intolerance).

Why Test for Candida Albicans:

There is such a wide range of conditions associated with Candida overgrowth that accurate diagnosis of Candidiasis cannot be made on the basis of symptoms alone. The only way to diagnose Candida overgrowth is to carry out a specific test aimed at detecting the presence of the organism.

Blood Sample:

Only a few fingerprick drops are required to do the analysis. If you have already provided a blood sample for the food intolerance test, this Candida test can be processed from the blood sample you have already provided.


Coeliac Test €90

The one word which summarised coeliac disease is “depleted”. Most patients suffer years of chronic ill health before a diagnosis is made. In most cases the associated symptoms scream the loudest. Because the associated exhaustion, depression, thyroid disease etc, is so distressing, it receives all the attention and all of the treatment. Yet all the time the true cause goes undetected.

You should really suspect CD if despite all the best treatment, your condition fails to improve.  This is because the proper diagnosis has not been made. In truth, many thousands of people are but treating the associated symptoms.


Coeliac Testing is simple and involves screening a blood sample for tissue Transglutaminase antibodies. A positive result from this coeliac testing is compelling evidence of Coeliac Disease. A follow-up intestinal biopsy may be performed for final confirmation.

Blood Sample:

Only a few fingerprick drops are required to do the Coeliac Testing analysis. If you have already provided a blood sample for the food intolerance test, this coeliac test can be processed from the blood sample you have already provided.


Thyroid Autoantibody Test

Thyroid disease is typically a malfunction of the thyroid gland, where the immune system destroys or stimulates thyroid tissue. It is almost always caused by the autoimmune condition Hashimoto’s Thyroiditis, in which the body’s immune system reacts against the thyroid gland gradually making it inactive and causing hypothyroidism, or by Graves Disease, where the production of thyroid hormone is stimulated causing hyperthyroidism.

Symptoms of Hyperthyroidism

  • Rapid weight loss
  • Palpitations (rapid heartbeat)
  • Irritability and nervousness
  • Goitre (enlargement of the thyroid gland)
  • Eye staring or bulging of eyes in socket


Thyroid Antibody Test €90

Symptoms of Hypothyroidism

  • Weight gain
  • Fatigue
  • Cold and constipated
  • Depression and anxiety

The new thyroid autoantibody test is able to detect these antibodies sent out to attack the thyroid gland. Early detection of raised thyroid antibody levels can often precede the onset of symptoms by a year or more. The presence of these thyroid antibodies unequivocally confirms the diagnosis of thyroid disease.

Blood Sample:

Only a few fingerprick drops are required to do the analysis. If you have already provided a blood sample for the food intolerance test, this thyroid autoantibody test can be processed from the blood sample you have already provided.