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Allergy and Asthma Center of Rochester

1135 West University Dr. #135

Rochester, Michigan 48307

Tel: 248 - 651 - 0606   Fax: 248 - 651 - 5335

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Tel: 248.651.0606

 

Fax: 248.651.5335

 

 

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Beaumont, Troy

 

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There is an enormous range of allergy and intolerance tests available. Some have been proven to be reliable and accurate, while others seem to be of no value.

 

Most of these tests diagnose non-existent illnesses, are a waste of money, and divert attention from actual allergies thus delaying conventional treatments that offer genuine allergy relief.

 

Many unconventional allergy tests are available which purport to diagnose a number of maladies. Tests range from electro dermal tests to trace metal estimation in hair samples. These un-validated tests are sometimes promoted by complementary and alternative medicine (CAM) practitioners. Superficially many of these tests sound plausible, but are based on unproven theories and explained with simplistic physiology.

 

Testing for IgG4 against foods is not recommended as a diagnostic tool

 

“Serological” tests for immunoglobulin G4 (IgG4) against foods are persistently promoted for the diagnosis of food-induced hypersensitivity. Since many patients believe that their symptoms are related to food ingestion without diagnostic confirmation of a causal relationship, tests for food-specific IgG4 represent a growing market. Testing for blood IgG4 against different foods is performed with large-scale screening for hundreds of food items by enzyme-linked immunosorbent assay-type and radioallergosorbent-type assays in young children, adolescents and adults.

 

However, many serum samples show positive IgG4 results without corresponding clinical symptoms. These findings, combined with the lack of convincing evidence for histamine-releasing properties of IgG4 in humans, and lack of any controlled studies on the diagnostic value of IgG4 testing in food allergy, do not provide any basis for the hypothesis that food-specific IgG4 should be attributed with an effector role in food hypersensitivity.

 

In contrast to the disputed beliefs, IgG4 against foods indicates that the organism has been repeatedly exposed to food components, recognized as foreign proteins by the immune system. Its presence should not be considered as a factor, which induces hypersensitivity, but rather as an indicator for immunological tolerance, linked to the activity of regulatory T cells. In conclusion, food-specific IgG4 does not indicate (imminent) food allergy or intolerance, but rather a physiological response of the immune system after exposition to food components. Therefore, testing of IgG4 to foods is considered as irrelevant for the laboratory work-up of food allergy or intolerance.

 

The Leucocytotoxic Test (Bryan’s Test)

 

Bryan’s Leukocytotoxic test was originally developed in 1956 by Black, and further elucidated by Bryan in 1960. The basis of the test is that if the patient’s white blood cells are mixed with the offending allergen, they swell. The test then measures any swelling of the leukocytes and if a certain threshold of swelling is measured, using a "Coulter Counter"--a Positive result is recorded. Studies to date have shown poor correlation between this test and clinical allergy. The marketers, who rely on anecdotal evidence of efficacy, do not mention these disappointing clinical studies. A large number of allergens are tested for and patients are usually positive to a number of foods, additives and other agents.

 

ALCAT Test

 

Personal communication with Katelaris in Australia and Steinman in South Africa plus Lieberman’s study in USA confirm that preliminary studies on the ALCAT test found no diagnostic accuracy. At present the test is also marketed under the name “Nutron.” Despite claims to the contrary, no large studies have ever shown the test to be accurate despite it being available for over 50 years.

 

The IgG ELISA Allergy Test

 

Another allergy test of questionable accuracy is IgG ELISA test. The test measures IgG antibodies to various foods, which should not be confused, with IgE antibody testing in conventional RAST and ImmunoCAPS. Most people develop IgG antibodies to foods they eat and this is a normal non-specific response indicating exposure but not sensitization. There is no convincing evidence to suggest that this test has any allergy diagnostic value. In fact, the IgG response may even be protective and prevent the development of IgE food allergy! IgG4 antibodies produced after high level cat allergen exposure in childhood confer cat allergy protection and not sensitization.

 

Applied Kinesiology (Muscle Testing)

 

Applied Kinesiology was developed in the USA by Goodhart in 1964 and relies on energy fields within the body to diagnose allergy and intolerance. Kinesiology is popular with Chiropractic practitioners in the United Kingdom. In this test, the practitioner tests the patient’s muscle strength when the allergen is placed in a vial in front of them. The shoulder strength (Deltoid muscle) is usually tested for weakness. The patient holds out their arm and the practitioner applies a counter pressure. If the patient is unable to resist the counter pressure, the test is considered positive to that allergen.

 

The antidote to the allergy is then also held in front of the patient and if their weakness is reversed, this indicates it is the correct antidote. There are a number of variations to the technique of muscle testing and many practitioners complement the test by holding a magnet in front of the patient. There is no convincing evidence that this test has any useful role to play in allergy diagnosis.

 

VEGA Testing (Electrodermal Testing)

 

This test was developed by German physician Dr. Reinhold Voll in 1958. The VEGA Test (or Electrodermal Test) involves measuring electromagnetic conductivity in the body using a Wheatstone bridge Galvanometer. The patient has one electrode placed over an acupuncture point and the other electrode is held while a battery of allergens and chemicals are placed in a metallic honeycomb. A fall in the electromagnetic conductivity or a “disordered reading” measured indicates an allergy or intolerance to that allergen.

 

Newer transistorized/computerized versions of the original VAGA or Voll test are called Dermatron, BEST, Quantum and LISTEN Systems which have a similar application and give more rapid results. Some proclaim to test for 3500 allergens in 3 minutes! Katelaris et al and Holgate performed independent double blind testing, comparing VEGA testing with conventional testing in known allergy sufferers, and the VEGA Tests had no reproducibility or diagnostic accuracy at all. The manufacturer’s aggressively promote the test and offer free training courses for potential “allergy” diagnosticians.

 

Hair Analysis Testing in Allergy

 

Hair is analyzed for allergies in two ways. First of all, the hair is tested for toxic levels of heavy metals such as Lead, Mercury and Cadmium and then deficiencies of Selenium, Zinc, Chromium, Manganese and Magnesium. There is no scientific evidence to support the hypothesis that these heavy metals have any bearing on allergic disease. Hair samples are usually sent away for analysis and numerous studies have failed to find any accuracy in hair analysis diagnosing allergies. Another hair test is called Dowsing. The dowser swings a pendulum over the hair and an allergy is diagnosed if an altered swing is noted.

 

Auriculo-Cardiac Reflex

 

Suspected allergens are placed in filter papers over the skin of the forearm. A bright light is shone through the ear lobe or back of hand. At the same time the pulse is assessed. If the filter paper contains an allergen to which the patient is allergic, the pulse increases by 12 or more beats per minute. To date, no scientific data is available to validate this test.

 

Provocation-Nuetralization Tests

 

The allergen is applied sublingually, or by skin injection. Increasing test doses are given until a wheal appears on the skin (Provocation Dose), the dose is then decreased until the wheal disappears. This is the Neutralization dose, which is used to treat the allergy and “desensitize” the patient. This test has also not been validated by studies and has no diagnostic reliability in allergy or treatment.

 

Nampudripad’s Allergy Elimination Technique (NAET)

 

NAET has to be the most unsubstantiated allergy treatment proposed to date. It consists of a combination of methods of diagnosing and treating allergy such as kinesiology, Vega testing and acupuncture. It was proposed in 1983 by American chiropractor Devi Nampudripad, hence Nampudripad’s Allergy Elimination Technique or (NAET). The premise is that allergy (contrary to our current understanding), is due to some form of internal energy blockage triggered by abnormal energy fields in the brain.

 

Nampudripad proposed that after 20 or so treatments she can re-programme the brain and the body energy flow and eradicate all allergies and many other diseases affecting mankind. However, as a cause of allergies, energy flow and electrical fields in the body have not ever been proven.

 

Live Blood Analysis

 

With the aid of a simple microscope and a short course in microscopy, many CAM practitioners are now professing to be able to diagnose all sorts of chronic ailments including allergies. The finger is pricked and a fresh blood specimen is examined under the light microscope for blood cell “deterioration,” rare parasites, or coagulation disorders. It is impossible to determine parasitaemia, bacteraemia or coagulation abnormalities on a drop of blood, without specialized stains and testing methods.

 

Stool analysis and microscopy for yeasts and parasites

 

Fringe laboratories in the USA operate a postal service, analyzing stool samples for bizarre metabolites and an array of exotic parasites and organisms that are purported to cause non-specific symptoms supposedly related to lifestyle allergies. Great Smokies Laboratories in the USA will do a full assessment of exotic microorganisms, bizarre bio chemicals and proteins on a stool sample and send a “comprehensive” report on these.

 

Beware of anecdotal and unsubstantiated allergy tests

 

There are a plethora of so-called tests for “intolerances” including urine, stool and saliva as well as Bio-resonance (Vibrational Medicine) and Iridology. These tests are often promoted as “wonder” diagnoses and anecdotal stories of lifelong allergies finally being accurately diagnosed abound. It would be very naïve for any medical practitioners to accept these individual anecdotal reports of diagnostic efficacy without any scientifically validated studies to prove their worth. We often read about similar tests in the media and unsuspecting patients flock to part with their hard-earned money.

 

Conventional medical practitioners may be accused of bias against these supposedly simple and “cheap” tests and feel pressured to try them out. On the other hand, a convincing CAM practitioner armed with an impressive allergy-diagnosing “contraption” can talk even the most sensible patient into believing their pseudo-scientific explanations and anecdotal reports of allergy cures. Once the patient realizes that they have been incorrectly diagnosed, they may feel embarrassed and want to bury this bad experience as fast as possible (not to mention the cost involved too). For more information on these dubious tests, visit the Quackwatch website at http://www.quackwatch.com

 

Unproven techniques in allergy diagnosis

 

“Mainstream” allergy diagnosis and treatment is based on classical allergy testing, which involves well-validated diagnostic methods and proven methods of treatment. By contrast, a number of unproven tests have been proposed for evaluating allergic patients including cytotoxic food testing, ALCAT test, bioresonance, electrodermal testing (electroacupuncture), reflexology, applied kinesiology, etc. There is little or no scientific rationale for these methods. Results are not reproducible when subject to rigorous testing and do not correlate with clinical evidence of allergy.

 

Although some papers suggest a possible pathogenetic role of IgG, IgG4 antibody, no correlation was found between the outcome of double-blind placebo-controlled food challenge (DBPCFC) and the levels of either food-specific IgG or IgG4, nor was any difference seen between patients and controls. The levels of these and other food-specific immunoglobulins of non-IgE isotype reflect the intake of food in the individual and may thus be a normal and harmless finding.

 

The so-called “Food Allergy Profile” with simultaneous IgE and IgG determination against more than 100 foodstuffs is neither economical nor useful for diagnosis. DBPCFC must be the reference standard for food hypersensitivity and any new test must be validated by it. As a result, all these unproven techniques may lead to misleading advice or treatments, and their use is not advised.

 

References:

 

 Allergy: Conventional and alternative concepts. The Royal College of Physicians, London, in Clin Exp Allergy: 22: suppl 3: Oct. 1992

 

American Academy of Allergy: Position statements-controversial techniques. J Allergy Clin Immunology 1981; 67:333-338

 

Sethi TJ, Lessof MH, Kemeny DM, Lambourn E, Tobin S, Bradley A. How reliable are commercial allergy tests? Lancet 1987;i: 92-94

 

Crook WG. The yeast connection. Jackson, Tennessee: Professional Books, 1984

 

Candidiasis hypersensitivity syndrome Executive committee of the American Academy of Allergy and Immunology. J. Allergy Clin Immunol 1986; 78:271-273

 

Niggemann B, Gruber C. Side effects of complementary and alternative medicines. Allergy 2003 58(8) 707-16

 

Ramsay H M, Goddard W, Gill S, Moss C. Herbal creams used for Atopic Eczema in Birmingham UK, illegally contain potent corticosteroids. Arch Dis Child 2003 85(12) 1056-7

 

Warner J. Allergy and the media. Pediatric Allergy Immunology 2005; 16: 189-90

 

Lieberman P, Crawford L, Bjelland J et al. Controlled study of cytotoxic food test. JAMA 1975; 231-728-30

 

Lay Advisory Committee. Allergy and allergy tests: A guide for patients and relatives. The Royal College of Pathologists (London) June 2002: 1-10

 

Alternative Allergy Tests with No Proven Value.

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