Lab test

Whey Allergy Test - Milk Allergy

A whey-specific IgE blood test measures antibodies the immune system may produce against whey, one of the two main proteins found in milk and present in the liquid portion.

Typical price

From $49

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

A whey-specific IgE blood test measures antibodies the immune system may produce against whey, one of the two main proteins found in milk and present in the liquid portion. It is a screening tool for suspected milk allergy rather than a diagnosis on its own. A clinician may order it after a reaction to milk or whey-containing foods, as part of a broader food panel, or when symptoms suggest sensitivity.

• Whey protein-specific IgE Antibodies produced in response to whey proteins, used to assess sensitization.

• Hives, itching, or swelling after consuming milk or whey-containing products
• Digestive symptoms following milk, yogurt, or whey protein shakes
• Eczema or skin symptoms that flare around milk intake
• Testing as part of a broader food or dairy allergy panel
• A history of reactions to milk proteins such as casein

• No fasting is required for most IgE allergy tests
• Inform the collector about antihistamines or other medications you take
• Stay hydrated before the blood draw
• No dietary preparation is needed before testing

An elevated whey-specific IgE level may indicate sensitization to whey proteins and can be associated with allergic symptoms, but a positive result alone does not confirm a clinical allergy. A low or undetectable level makes allergy less likely without excluding it. Whey and casein are different milk proteins, so a healthcare provider should interpret the result with your history.

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