Test library
Casein IgE Test
A casein allergy blood test measures IgE antibodies against casein, a major protein in cow's milk. It helps distinguish a true milk protein allergy from lactose intolerance and other reactions to dairy.
Order Casein Allergy Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Casein Allergy Test- Typical turnaround
- 1-3 business days
- Starting price
- From $49
- Results
- Confidential, online
Quick answer
The casein allergy test measures immunoglobulin E antibodies against casein, a protein that makes up a large share of the protein in cow's milk. A true milk allergy involves the immune system, while lactose intolerance is a digestive issue with different symptoms. The blood test helps tell these apart. A qualified healthcare provider interprets the result with the person's reaction history.
What this test measures
Cow's milk contains two main protein groups: casein and whey. Casein accounts for roughly four-fifths of milk protein and is the curd that forms when milk is treated with acid or rennet. An IgE-mediated allergy to casein can cause hives, vomiting, wheezing, or more severe reactions shortly after consuming milk or dairy products.
The test measures allergen-specific IgE against casein in a serum sample. It reports whether antibodies are present and may provide a level or reactivity class. Because casein is present in many dairy foods, including cheese, yogurt, and butter, identifying the specific protein helps guide dietary decisions with a clinician.
A positive result indicates sensitization to casein. Not every sensitized person has symptoms, and milk allergy is more common in young children, some of whom outgrow it. A healthcare provider considers the reaction history, timing, and other tests before advising on avoidance or further evaluation.
- Casein specific IgE
- Total serum IgE
- Quantitative allergen-specific IgE level
- IgE reactivity class for casein
- Cow's milk protein components (casein, alpha-lactalbumin, beta-lactoglobulin)
- Whey protein specific IgE
Why people order this test
- Distinguish a milk protein allergy from lactose intolerance
- Investigate hives or digestive symptoms after dairy
- Assess suspected allergy in infants and children
- Clarify reactivity within a broader food panel
- Guide dietary discussion with a qualified provider
How to prepare
No fasting is required. A blood sample is collected from a vein, usually at the arm. Follow the laboratory's instructions, particularly if this test is combined with other food allergy tests.
Understanding your results
Results are usually available within one to three business days. The report shows the specific IgE level and reactivity class for casein. An elevated value indicates sensitization, and a healthcare provider interprets it with the person's symptoms and exposure history.
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Frequently Asked Questions
What is casein?
Casein is the main protein in cow's milk, making up about four-fifths of its protein content. It is the curd that separates when milk is acidified.
Is a casein allergy the same as lactose intolerance?
No. Casein allergy involves the immune system and IgE antibodies, while lactose intolerance is a digestive problem with the milk sugar lactose.
Can a casein allergy be outgrown?
Some children outgrow milk protein allergies, but this varies. A healthcare provider can advise based on the individual.
How is the test done?
A small blood sample is drawn and analyzed for IgE antibodies that react to casein.
Do I need to fast?
No fasting is required for this test.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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