How accurate are allergy tests?

Depends. The results of the allergy skin test are interpreted in 20 minutes after they are placed, so you have that information right away. Allergy blood tests (specific ige) usually takes a few days or up to a week depending if the blood sample is processed in the lab or sent to a reference lab in a different city.

Related Questions

Can gluten-free, diary-free diet help with autism symptoms? How accurate are the food allergy tests? What allergy tests do you recommend for autism?

See below. Food allergy tests have many false positives and are a complicated subject. For an informative article see this site. http://www.webmd.com/diet/features/diet-and-autism. Read more...
Sometimes. Controversial subject. The research was done using a parent survey. Some parents report behavior improvement on dairy free/ gluten free diets, many others saw no effect. Continung > 6 months shows more benefit. It can be expensive and time consuming, but it is easier at this age than later. Kids who has GI symptoms such as constipation or diarrhea respondeed better to the dietary restrictions. Read more...
No/none. Sometimes you can track down the genetic misinformation that triggers autism with a special chromosomal microarray study.The more we study the human genome the more we find information to explain these issues. Special diets and food allergy profiles have a cult following, but positive results are based more on social media testimonials. A good workup by a developmental pediatrician is worthwhile. Read more...

Can you tell me how accurate are allergy skin tests?

Allergy testing. If prick skin testing is done by an experieenced board certified allergist using conventional allergens and a standardized skin testing device, skin testing typically detects more than 95% of allergic patients. Intradermal testing in which allergens are injected under the skin is much less reliable and frequently over-diagnoses the presence of allergy. Prick testing should always be done first. Read more...

How accurate are food allergy blood tests? Do they generally detect then well?

Not very accurate. There are no double blind studies to show accuracy. The best test is feeding test where a food is eliminated for about 1 week and then reintroduced to see if it causes symptoms. Never test a food that has or you may suspect that it may be a cause for anaphylactic or severe reaction including angioedema. . Read more...

How accurate are allergy skin prick tests? Are 'true' allergies only manifested by nasal/eye secretions?

Quite accurate. if performed correctly with controls by experienced staff, you don't need to have eye / nose symptoms if you have allergies, asthma is an allergic disease too, some patients do have significant reactions on prick testing yet they have no manifest allergic disease, Read more...
Not just eyes/nose. True IgE mediated allergy can affect all external body surfaces including eyes, nose, intestinal tract, skin, and lungs. As for skin prick test, the accuracy often depends on the extracts used (standardized ones are better) and the size of the reaction (the larger the more likely). Although a positive response indicates sensitization, the test results need be interpreted by an allergist. Read more...

Are allergy tests for food sensitivites and/or allergies fairly accurate?

Yes. Allergy testing is fairly accurate for allergies due to ige mediated allergic reactions. Others types of immune and non-immune reactions are not detected by this type of testing. In addition the results of testing need to correlate with (match) the clinical picture and in some instances food and/or drug challenges will need to be dome. See an allergist for evaluation and interpretation of results. Read more...

Are skin-prick allergy tests accurate/trustworthy? I still get occasional hives & worry about foods, but my allergy test showed no food reactions.

Hives - not allergy. Prick skin tests are helpful if positive and the patient has a history suggestive of allergy. They are insufficient to make a diagnosis of food allergy by themselves. Hives, in most cases, are not a sign of allergy, particularly in chronic cases. Also, the likelihood of new food allergies at your age is very low. Unless there are there symptoms and antihistamines control your symptoms. Read more...