Lactose intolerance is a digestive condition where the body cannot properly break down lactose, a sugar found in milk and dairy products. It is caused by insufficient production of lactase, the enzyme needed to digest lactose in the small intestine. The Allergen Specific IgE Lactase test is the most important test for diagnosis as it measures whether lactase deficiency is causing your symptoms.
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Lactose intolerance is caused by insufficient production of lactase, an enzyme produced in the small intestine that breaks down lactose into simpler sugars for absorption. Without enough lactase, undigested lactose moves into the colon where bacteria ferment it, producing gas, bloating, and diarrhea. This lactase deficiency can develop naturally with age, as enzyme production decreases after childhood, or it can be genetic, particularly common in people of Asian, African, Hispanic, and Native American descent.
The Allergen Specific IgE Lactase test is the most important blood test for lactose intolerance because it measures IgE antibodies specific to lactase and helps determine if lactase deficiency is causing your digestive symptoms. This test provides direct insight into your body's ability to produce the enzyme necessary for lactose digestion. Additionally, the Whey (f236) IgG and Beta lactoglobulin (f77) IgG tests are valuable for distinguishing between lactose intolerance and dairy protein sensitivities, helping identify whether your symptoms stem from enzyme deficiency alone or combined immune responses to milk proteins.
You should get tested if you consistently experience bloating, gas, diarrhea, or stomach cramps within 30 minutes to 2 hours after consuming milk, cheese, ice cream, or other dairy products. Testing is especially important if you notice these symptoms interfering with your daily life or if you have a family history of lactose intolerance. You should also consider testing if you are avoiding dairy products without confirmation of intolerance, as you might be missing out on important nutrients unnecessarily.
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What this means
Your test came back negative, meaning no IgE antibodies to lactase were detected in your blood. This suggests your digestive symptoms after dairy consumption are likely not due to a true dairy allergy, and may be caused by lactose intolerance or another digestive issue instead.
Recommended actions
Consider testing for lactose intolerance if dairy still causes symptoms
Keep a food diary to identify other potential trigger foods
Gradually reintroduce dairy products while monitoring symptoms
Consult with a gastroenterologist if digestive issues persist
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