Sorry, but negative allergy test means usually nothing.
Were you tested for IgE or IgG immunoglobulins or both ?
Was it a skin test or a blood test or an oral challenge test or all of those ?
How many IgE or IgG immunoglobulins were you tested for ?
Negative allergy test only means that specific IgE levels or specific IgG levels
were lower than some expected level.
There are IgE / IgG antibodies you were most likely not tested for, and there are many other reasons why you may get false negative readings on many different tests.
Try to google false negative on allergy tests to get a picture on how common it is and how of no value a negative test is.
(Conversely, these tests can give false-negative results in patients who have true IgE-mediated disease as confirmed by skin testing or allergen challenge. The sensitivity of blood allergy testing is approximately 25% to 30% lower than that of skin testing, based on comparative studies.2 The blood tests are usually considered positive if the allergen-specific IgE level is greater than 0.35 kU/L; however, sensitization to certain inhalant allergens can occur at levels as low as 0.12 kU/L.14
Specific IgE levels measured by different commercial assays are not always interchangeable or equivalent, so a clinician should consistently select the same immunoassay if possible when assessing any given patient over time.15
end of excerpt)
The only absolute test for allergies is complete water fasting, with no cosmetics and no soaps and no detergents on you or in your closes environment (clothes, shoes etc).
If you would get negative on Water Fasting
test, than you could say you do have a real and serious problem.
Negative on absolute Water Fasting
would mean you have absolutely no improvement with your lips after 10 or 20 or 30 days of going on water only.
You may get some ideas what happens to your body when you stop eating, by reading the next stories:
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