There isn't a "normal range" for a milk allergy in the sense of a typical acceptable level. Instead, milk allergy testing, specifically IgE testing, provides a range of values that indicate the likelihood of an allergic reaction. A result is interpreted based on a scale, with higher values suggesting a greater probability of allergy.
Understanding Milk Allergy Testing and IgE Levels
Milk allergy is often diagnosed through a combination of methods, including skin prick tests and blood tests that measure the amount of IgE (immunoglobulin E) antibodies specific to milk proteins. IgE antibodies are produced by the immune system in response to an allergen, such as milk.
The Mayo Clinic Laboratories provides the following reference ranges for IgE testing related to milk allergy:
| Class | IgE kU/L | Interpretation |
|---|---|---|
| 0/1 | 0.10-0.34 | Borderline/Equivocal |
| 1 | 0.35-0.69 | Equivocal |
| 2 | 0.70-3.49 | Positive |
| 3 | 3.50-17.4 | Positive |
Interpreting the Results
- Borderline/Equivocal (0.10-0.69 kU/L): This range suggests a possible sensitivity to milk, but further evaluation may be needed. A doctor might recommend an oral food challenge to confirm the allergy.
- Positive (0.70 kU/L and above): This range indicates a likely milk allergy. The higher the IgE level, the greater the probability of an allergic reaction upon exposure to milk.
Important Considerations:
- These ranges are guidelines, and the interpretation should always be done by a qualified healthcare professional, considering the individual's clinical history and symptoms.
- A positive IgE test does not always mean someone will have a severe allergic reaction. The severity of the reaction can vary.
- Negative test results do not always exclude a milk allergy, especially if symptoms strongly suggest an allergy.
- Other diagnostic methods, like skin prick tests or oral food challenges, might be necessary.
In summary, there isn't a "normal range" for milk allergy; instead, IgE test results are interpreted on a scale to assess the likelihood of an allergic reaction. A higher IgE level generally indicates a greater probability of a milk allergy. Interpretation of these results should be done by a medical professional.
