Woken at 2 a.m. by hives, hours after a burger you have eaten all your life? That delay is the hallmark of alpha-gal, a sugar in red meat that some people make IgE to after tick bites. Our test checks your blood for IgE to alpha-gal, as part of 300 allergens and allergen components, next to beef, pork, lamb and other meats.
Alpha-gal (galactose-alpha-1,3-galactose) is a sugar, not a protein. It sits on proteins and fats in the meat of almost all mammals except humans and other apes. Chicken, turkey and fish do not carry it.
Most people never make IgE to it. Tick bites change that for some. In Europe the common culprit is the castor bean tick (Ixodes ricinus), found from Ireland to Finland, in woodland, long grass and gardens. In the United States it is mainly the lone star tick. That is why alpha-gal syndrome often starts in adults who ate red meat for years without a problem.
The pattern that stands out is the delay. People describe reactions starting about two to six hours after eating red meat, often in the night after an evening meal. Hives and itching, swelling, stomach cramps, diarrhoea and vomiting are common reports, and some people have severe reactions.
Because of the delay, the meat is rarely the first suspect. Fatty cuts and offal are often reported as worse, and alcohol, exercise or painkillers such as ibuprofen on the same day can make a reaction more likely.
Swelling of the lips, tongue or throat, trouble breathing or feeling faint, even hours after eating, is an emergency. Call 112 (EU) or your local emergency number. Do not wait for a test.
Classic meat allergies target proteins and usually start within minutes. Alpha-gal is different: it is a sugar shared by beef, pork and lamb alike, so sensitisation tends to cover all red meat at once, not one animal.
There is a separate pattern called pork-cat syndrome. People sensitised to cat serum albumin (Fel d 2) sometimes react to pork, usually quickly rather than hours later. Seeing alpha-gal, cat and the single meats on one report helps a doctor tell the two apart.
From a finger-prick sample, the lab measures IgE to alpha-gal carried on beef thyroglobulin, a protein rich in alpha-gal, as part of 300 allergens and allergen components. Beef, pork, lamb, horse and rabbit meat, cow's milk and cat are on the same panel, so you see the whole picture in one report.
A positive result means your blood shows IgE to alpha-gal. That is sensitisation, not a diagnosis. Your lab report gives the value a class from Negative to Very high. Take it to a doctor, especially if you have had delayed reactions after meat.
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One finger-prick sample checks IgE to 300 allergens and allergen components, from birch and peanut to cat and house dust mite. Post it to the lab, and about 5 days after it arrives you get a value for every one. Our plain-English guide shows you how to read them. €399 in total, €1.33 per allergen.
Yes, that is the best-supported explanation for alpha-gal syndrome. After tick bites, some people start making IgE to alpha-gal, a sugar found in red meat. In Europe the castor bean tick (Ixodes ricinus) is the usual suspect. Not everyone who is bitten becomes sensitised, and nobody yet knows exactly why some do.
Alpha-gal in meat is partly carried on fat particles, which the body absorbs and processes slowly. That is the leading explanation for why reactions typically start two to six hours after a meal, often at night, instead of within minutes.
Poultry and fish do not carry alpha-gal, so they are not part of the alpha-gal pattern. They can still trigger their own, separate allergies. Talk to a doctor about your results before changing your diet.
It can. In some people alpha-gal IgE falls over months to years without new tick bites, while further bites can raise it again. A doctor can decide when retesting makes sense.
