Olive (Ole e 7) IgE

If your spring allergies tip into wheezing, or your mouth itches after a peach, this result can help explain why. It looks for an allergy antibody against one specific protein in olive tree pollen. In regions with heavy olive pollen, people who carry that antibody are more likely to have asthma, and more severe asthma.

It also changes practical decisions. A positive result can point toward fruit cross-reactions, shape which allergy shots make sense, and flag a higher chance of reactions during that treatment. Standard olive pollen tests are built mostly around a different protein, so this sensitivity can go unseen.

What This Antibody Recognizes

IgE (immunoglobulin E) is the antibody class behind classic allergies. When your immune system decides a harmless protein is a threat, it makes IgE that recognizes that protein. Those antibodies sit on allergy cells, which release histamine and other chemicals the next time you meet the protein. Carrying IgE against something is called sensitization.

This test measures IgE against Ole e 7 (Olea europaea allergen 7), one of several separate proteins in olive tree pollen. Researchers first identified and characterized it in 1999. The name follows the species: Ole e comes from Olea europaea, the olive tree, and the number marks the order in which the protein was identified. Ole e 1 is the main olive pollen allergen. Ole e 9 is another olive pollen protein that shows up in more complicated cases, and both come up repeatedly below.

Ole e 7 belongs to a family called lipid transfer proteins. Plants use these small proteins to move fats around, and close relatives of them sit in other pollens and in fruits such as peach. That family resemblance is why a sensitivity that starts with pollen can spread to food.

Results are usually reported in kU/L, the standard unit for single-allergen specific IgE blood tests. A higher number means stronger sensitization. Because the test uses one purified protein instead of a whole-pollen mixture, it is called a component test, and that precision is what lets it separate one clinical pattern from another.

Asthma Severity in Heavy Pollen Regions

The most detailed human data come from Jaén in southern Spain, where olive pollen exposure is intense and lasts for weeks. A second large study from Italy looked at which symptoms go with which olive proteins.

Source: Alcántara Villar et al. (rows 1 and 2); Scala et al. (row 3).

What this means for you: a positive result is most informative alongside Ole e 1 and Ole e 9. If all three come back positive and you have spring asthma, your pattern is the one most often linked to severe disease, which is a reason to get your asthma control and lung function checked before the next season instead of waiting for a bad one.

Few people react to this protein alone. In Jaén, only 5.5% were positive for it without the other main olive proteins, while 37.6% were positive for it together with both Ole e 1 and Ole e 9. Among those who were positive, the median level was 5.96 kU/L.

Why Location Changes the Picture

One study ties this antibody to asthma and another ties it to food reactions, which can look like a contradiction. Both fit once you read the result as a record of how and where you were exposed. In most populations, Ole e 1 is the dominant marker of olive pollen sensitization. Where olive pollen is heavy and long-lasting, such as parts of southern Spain, Ole e 7 can be the protein that starts sensitization, and it becomes a major allergen in its own right; some people there are negative for Ole e 1 but positive for Ole e 7. These patterns are best documented in regions with prolonged, very high exposure.

Where exposure is lighter, the antibody more often shows up as part of a broader sensitivity to related proteins in fruit, and the Italian data tied it to oral symptoms. So the same positive result carries more breathing risk if you live or grew up in an olive-growing region, and more food-reaction relevance if you didn't. Your history of where you've lived belongs in the interpretation.

Peach and Fruit Cross-Reactions

The peach version of this protein is called Pru p 3. In blood from people sensitized only to Ole e 7, adding the peach protein blocked between 25% and 100% of the antibody's binding to Ole e 7, which means the same antibodies recognize both. In 31% of those people, their own allergy cells reacted to the peach protein in lab testing of their blood samples.

This is the route by which a pollen sensitivity can become a food one. In heavy olive regions, Ole e 7 may be the first exposure, with peach reactivity following. Studies from those regions have also linked Ole e 7 sensitization to more severe reactions to plant foods such as peach and related fruits, including anaphylaxis. If you're positive and have ever had itching, swelling, or a stronger reaction after peaches or similar fruit, peach Pru p 3 IgE is the logical next test. If you're positive and eat these foods without trouble, the test alone isn't a reason to cut them out.

Reaction Risk During Allergy Shots

Olive pollen extracts used for allergy shots are standardized mainly to Ole e 1, and the amount of Ole e 7 and other minor proteins in them varies. In the Jaén data, people sensitized to both Ole e 7 and Ole e 1 had a higher rate of reactions spreading beyond the injection site while doses were being built up. If Ole e 7 is the dominant signal, a standard extract may also be a poorer match. Knowing your result before treatment starts lets you and an allergist plan the extract and build-up with that risk in mind.

Component testing changes decisions often enough to matter. Testing individual proteins changed the diagnosis in about 30% of pollen allergy cases in one comparison, and it changed the immunotherapy choice in at least half of people sensitized to several pollens, often by separating true olive allergy from grass allergy that overlaps in season.

Reading a Positive or Negative Result

A negative result doesn't rule out olive pollen allergy. In older studies of olive-allergic people, roughly 41% to 57% carried this antibody, and in the 2025 Jaén study of people with seasonal breathing allergies the figure was 62.0%. The share depends heavily on how much olive pollen people are exposed to, while Ole e 1 is found in roughly 80% to 90% of olive-allergic people. If you have clear symptoms during olive season and test negative here, Ole e 1 is the next place to look.

A positive result is usually a real sensitization to this protein. In older olive-pollen studies, control groups without olive allergy did not react to the purified proteins on skin testing. Sensitization and allergy are still different things, though. For food allergy blood tests in general, only about half of positive results turn out to reflect a true allergy, which is why testing works best when it follows real symptoms. If you carry the antibody but have no symptoms around olive pollen or fruit, you're sensitized, and that's a finding to watch that doesn't amount to an allergy diagnosis.

When Results Can Be Misleading

Specific IgE is a fairly stable measurement, but a few things can push a single reading in a direction that doesn't reflect your allergy.

• Anti-IgE injections: omalizumab, an injected drug that binds IgE, raises measured total IgE because drug-antibody complexes stay in the blood longer. Specific IgE results while you're on it can be hard to interpret, so a jump does not automatically mean your allergy worsened.
• Recent heavy exposure: repeated nasal exposure to birch pollen allergen raised birch-specific IgE by a median of 59.2% in a trial, while antibodies to unrelated allergens, including olive, stayed stable, so draw your blood at a consistent point in the pollen season.
• Drugs that shift IgE broadly: dupilumab, used for eczema and asthma, tends to lower IgE after about eight weeks, prednisolone blunted IgE rises after surgery, and pholcodine, a cough suppressant formerly sold in some countries, raised total IgE many-fold in sensitized people, though these studies tracked total or drug-related IgE and not this olive antibody.
• Different lab systems: Ole e 7 IgE can be measured on single-protein assays or on multi-allergen chips, and these agree well for most allergens but aren't identical, so compare results from the same lab and platform.

Tracking Your Trend

A single result answers whether you're sensitized. Repeating it shows direction, which matters most if you start allergy shots, move into or out of an olive-growing region, or notice symptoms changing from season to season.

With allergy shots using olive pollen extract, antibody to the whole olive extract fell by roughly 39% over a year in a controlled study, while untreated people didn't change. That study measured the whole-extract antibody, so how Ole e 7 specifically moves on treatment is less certain. In studies of other pollens, specific IgE often rises in the early months of shots and then declines gradually over several years, so an early bump isn't a bad sign.

For trend comparisons, use the same lab and try to test at the same point in the pollen season.

Read the number next to your symptoms. In a trial of under-the-tongue olive immunotherapy in children, symptoms and skin reactivity improved over two years while specific IgE didn't change significantly, so a flat number on treatment doesn't mean it failed.

What to Do Next

What you do with this result depends on which other olive proteins you react to and what symptoms you have. These are the common patterns.

• Positive with spring asthma: add Ole e 1 and Ole e 9 if you don't have them, and if you're triple positive, get lung function testing and an asthma control review with an allergist or lung specialist before the next pollen season.
• Positive with fruit symptoms: add peach Pru p 3 IgE and see an allergist to work out which foods matter for you and how carefully to approach them.
• Positive with no symptoms: don't restrict foods on the strength of the test alone, and use the same season and lab if you repeat the test later.
• Negative with clear olive-season symptoms: check Ole e 1 and grass pollen components, plus a profilin such as birch Bet v 2, which flags a cross-reactive pollen protein that can make many pollens look positive.
• Considering allergy shots: bring your full component profile to the allergist, because this pattern can raise build-up reaction risk and change which extract fits.