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Today there are many methods available such as cytotoxic testing, mediator release testing (MRT), enzyme-linked immunosorbent assay (ELISA) testing, microarray ELISA testing, and ELISA/ACT. Allergy US reviewed these methods and microarray technology appears to be the most reliable.
Multiple chemical sensitivity ( MCS ), also known as idiopathic environmental intolerances ( IEI ), is an unrecognized and controversial diagnosis characterized by chronic symptoms attributed to exposure to low levels of commonly used chemicals. [1] [2] Symptoms are typically vague and non-specific. They may include fatigue, headaches, nausea ...
Hypersensitivity (also called hypersensitivity reaction or intolerance) is an abnormal physiological condition in which there is an undesirable and adverse immune response to antigen. [1] [2] It is an abnormality in the immune system that causes immune diseases including allergies and autoimmunity. It is caused by many types of particles and ...
In a hydrogen breath test, the most accurate lactose intolerance test, after an overnight fast, 25 grams of lactose (in a solution with water) are swallowed. If the lactose cannot be digested, enteric bacteria metabolize it and produce hydrogen, which, along with methane, if produced, can be detected on the patient's breath by a clinical gas ...
Skin testing on the arm is a common way for detecting an allergy, but it is not as effective as other tests. Patch test Diagnosis is usually based on a medical history , elimination diet , skin prick test , blood tests for food-specific IgE antibodies , or oral food challenge .
Heat intolerance is a symptom characterized by feeling overheated in warm environments or when the surrounding environment's temperature rises. [1] Typically, the person feels uncomfortably hot and sweats excessively. Compared to heat illnesses like heatstroke, heat intolerance is usually a symptom of endocrine disorders, drugs, or other ...
Drug intolerance or drug sensitivity refers to an inability to tolerate the adverse effects of a medication, generally at therapeutic or subtherapeutic doses. Conversely, a patient is said to be "tolerating" a drug when they can tolerate its adverse effects. Some instances of drug intolerance are known to result from genetic variations in drug ...
Risks of non-medical and self-diagnosed adoption of a gluten-free diet. Withdrawing gluten from the diet without previously carrying out a complete medical examination can hamper the diagnosis of celiac disease. Diagnostic tests (antibodies and duodenum biopsies) lose their usefulness if the person is already eating a gluten-free diet.
Diagnosis is often based on a diagnostic checklist to test whether an individual is exhibiting certain behaviors and characteristics. Clinicians will look at the variety of foods an individual consumes, as well as the portion size of accepted foods.
Many patients go undiagnosed or misdiagnosed and either untreated or treated for other disorders. Current tests for OI ( tilt table test, NASA Lean Test, [12] adapted Autonomic Profile (aAP), [13] autonomic assessment, and vascular integrity) can also specify and simplify treatment. [9]