Please note Allergyscope does not provide medical advice, and your tests will not diagnose, treat, or cure any disease or condition. Our service provides you with your medical information in a format you can easily share with the physician of your choice. A physician will need to review your history and other information, when interpreting results and making diagnoses. Included below is general information about allergy testing and information about how physicians will typically evaluate it.
Typically, a doctor will compare your lab result levels to predetermined cut-offs to understand the true meaning of the result. For example, for an adult, an IgE level of more than 7 for eggs is considered to be highly predictive (greater than 98% chance) that one is allergic to eggs. Attached below is one table available in the scientific literature1, that is commonly used by physicians. If you are looking at a food which is not listed below, then those thresholds have not been established yet, in the scientific literature.
|kU/L||Positive Predictive Value|
|Eggs||7 (2 for infants)||98%|
|Milk||15 (5 for infants)||95%|
IgE tests are generally great negative tests (if a result is negative, then you can be fairly certain that you don't have significant allergies). To validate positive results, an allergist will typically review your medical history (especially any history of a reaction), and also perform a skin-prick test. For example, if my almond (a type of tree nut) score is 20, then I can be relatively certain (>95%) that my IgE levels for tree nut are significant. However, this doesn't mean that my body will display a physical allergic reaction (e.g. headache, rash, hives) to almonds. I can only be sure if I test positive to skin-test and/or if I've displayed reactions like this in the past, to almonds.
Oral food challenge & food diary tests can also provide a more thorough understanding of associated symptoms. Oral food challenge tests should be conducted under the supervision of a doctor.
Lastly, it's important to note that as immune systems develop and grow, allergies can change over time, and often outgrown. Because of this, many physicians will advise that you repeat IgE tests, especially for foods with high scores, each 1-2 years.