- What is metal hypersensitivity?
Many everyday metals can cause a type IV delayed type hypersensitivity reaction in genetically predisposed individuals. This type of "allergy" is mediated by T-lymphocytes (white blood cells) that have had prior contact with a given allergen (memory lymphocytes). When they are exposed to the sensitizing allergen, these memory lymphocytes respond by enlarging (lymphoblast transformation) and dividing (proliferation). The newly formed cells (effector cells), together with their secreted cytokines, mediate the resulting allergic reaction. See How does the MELISA test work?
- Which symptoms may indicate metal allergy?
The classic symptom of metal hypersensitivity is allergic contact dermatitis. In addition to local symptoms, chronic exposure to metals may cause a wide range of systemic symptoms in susceptible people. Metal hypersensitivity has been implicated in the aetiology of chronic fatigue syndrome (CFS), multiple sclerosis (MS), fibromyalgia and multiple chemical sensitivity (MCS). Additionally metal hypersensitive clients report symptoms such as joint and muscle pain, extreme fatigue, depression and "brain-fog".
- Which metals cause allergy?
- Where can metals be found?
Dental restorations - fillings, crowns, implants and braces
Orthopaedic devices - knee and hip replacements, pins and plates
Cardio and Vascular - embolization coils, stents, septal occluders, implanted defibrillators and pacemakers
Environmental - jewellery, cell phones, coins, certain foods and medications etc.
See HERE for more information.
- In which fields of medicine does a metal allergy play an important role?
- How can a metal allergy be diagnosed?
With a skin test or, more objectively and safely, with the MELISA test.
- Is the MELISA test clinically validated?
Yes, during development of the test by Prof. Vera Stejskal as well as in follow-up studies by others (see Articles).
- How does the MELISA test work?
MELISA is an acronym for Memory Lymphocyte Immunostimulation Assay. White blood cells (lymphocytes) from whole blood are isolated and tested against allergens chosen according to the patient’s anamnesis, including dental and occupational history. The blood is incubated for five days and the lymphocyte reaction is measured by two separate technologies: one based on the uptake of a radioisotope by dividing lymphocytes; the other on an evaluation by microscopy. The level of reactivity is measured as a Stimulation Index (SI). A value over 3 indicates a positive reaction to a given allergen. Finally, a report is produced.
- What material is required for the MELISA test?
A MELISA laboratory needs 20-40 ml of blood depending on the number of metals to be tested. The blood has to be drawn into special tubes containing sodium citrate (an anti-coagulant). The patient should not be taking any immuno-suppressive medication as this may affect the test results. Examples of such medication are steroids, allergy medicine, anti-inflammatory medicine, painkillers etc.
- Can the blood samples be sent to a laboratory?
Yes, with a courier such as FedEx. The blood sample must be kept at room temperature and arrive in the laboratory ideally within 24 hours (maximally 48 hours) of drawing. Write on package: “Warm transport, do not chill”. Label samples “Diagnostic specimens, non-infectious, non-hazardous”. See Order MELISA and Sending blood for more details.
- How long does the MELISA test take?
Results are normally available approximately 10-14 days after receipt of sample.