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Food Mix Panel (fx77)

Food mix fx77: sensitised or allergic to sesame, hazelnut, tomato, kiwi or cashew

IgE are allergy antibodies that the body makes in an allergy against a harmless substance such as pollen or a food, and food mix fx77 measures those antibodies against five foods at once; according to the manufacturer Thermo Fisher, these are sesame seed, hazelnut, tomato, kiwi and cashew.

A raised fx77 result can point to an allergy according to the NVKC, the Dutch society for clinical chemistry, but sometimes the value is raised without symptoms that point to allergy; the person is then called sensitised rather than allergic. Only a blood test measures how much IgE there is in the blood against these foods.

According to the NVKC, an allergy test with a result above 0.35 U/ml can point to an allergy. None of the laboratory guides read publishes a limit of its own for the fx77 mix.

Doctor's Assessment Included

Food mix fx77 measures IgE antibodies against five foods together in one test: sesame seed, hazelnut, tomato, kiwi and cashew. The NVKC gives below 0.35 kU per litre as the reference value for IgE against specific allergens; no laboratory guide read publishes a limit for fx77 itself.

A positive fx77 result is not proof of a food allergy on its own; the diagnosis is made on symptoms, possibly supported by the IgE result.
A positive fx77 result does not say which of the five foods gives the reaction.
A normal fx77 result does not rule out a food allergy, and says nothing about foods outside the mix, such as milk, egg, wheat, soy, peanut and fish.

Food Mix Panel (fx77): what this test measures

Food mix fx77 measures the IgE against the five foods in one measurement and points to none of them separately, so a positive result leaves open which food gives the reaction. Unilabs reports a comparable mix, the meat mix fx73, in classes rather than as a concentration.

Food Mix Panel (fx77): why this value matters

An fx77 result only gains meaning next to the symptoms: according to the NVKC, the doctor combines the symptoms with the test result to decide whether there is a real allergy. A raised IgE result does not always fit the symptoms according to the NVKC, which is why an allergy can only be diagnosed on the basis of symptoms, possibly supported by the IgE result.

Food Mix Panel (fx77): how the blood test works

Referral: No GP referral needed. After the order we arrange the referral through ZorgDomein, within one business day; orders after 17:00 or at the weekend start on the next business day. ZorgDomein emails a barcode, and that barcode is what the draw site needs.
The draw: A blood draw from a vein in the arm, at a partner laboratory's draw site. No home kit, no finger prick.
Where: 650+ draw sites run by independent laboratories across the Netherlands. Draw sites

Food Mix Panel (fx77): when is testing worthwhile?

According to the NVKC, the doctor requests an allergy test in the blood such as fx77 with symptoms of a sudden or longer-lasting allergy, such as hives, eczema, a blocked nose, red and itchy eyes, itching of the lining of the mouth or asthma. According to Thuisarts, the Dutch GPs' patient website, a blood test is not needed to find out whether someone cannot tolerate a certain food.

Food Mix Panel (fx77): symptoms of a high or low value

Low Levels

A normal fx77 result usually means there is no real allergy to the foods tested, according to the NVKC, but even with a normal test a small chance of an allergy remains according to the NVKC. For foods outside the mix, such as milk, egg, wheat and peanut, a normal fx77 result says nothing.

High Levels

A positive fx77 result means there is IgE against at least one of the five foods, and in a food allergy the symptoms usually come straight after eating according to Thuisarts, often several at once. With hay fever, mild allergic symptoms of the mouth and throat can appear after eating some fruits and nuts, including hazelnut, according to Thuisarts, because the proteins in them closely resemble those of pollen.

Food Mix Panel (fx77): causes of a low or high value

What raises the value

IgE against sesame, hazelnut, tomato, kiwi or cashew

Food mix fx77 contains sesame seed, hazelnut, tomato, kiwi and cashew; IgE against any of these five can make the result positive.
A reaction in the blood without allergy

Sometimes only the blood reacts to substances in a food, without symptoms from that food; there is then no food allergy and that food can simply be eaten.

Food Mix Panel (fx77): lifestyle and this value

With a positive fx77 result and only a little trouble in the mouth and throat after certain kinds of fruit and nuts, those can simply still be eaten according to Thuisarts; that does no harm. With a lot of trouble, those kinds of fruit and nuts can be left out according to Thuisarts, and with a confirmed food allergy the food should no longer be eaten.

Food Mix Panel (fx77): frequently asked questions

What is the difference between sensitised and allergic?

Sensitised means, according to the NVKC, that an allergy test such as fx77 shows a raised value without symptoms that point to allergy. Whether there is a real allergy is decided by the doctor, according to the NVKC, by combining the symptoms with the test result.

Does a high fx77 result predict a severe reaction?

No, the height of an allergy result such as fx77 does not predict how bad the allergic reaction will be, according to the NVKC. The chance that someone reacts to the tested substance is, however, greater the more antibody is present, according to the NVKC.

Which foods are not in fx77?

Milk, egg, wheat, soy, peanut, fish and shellfish are not in food mix fx77, because according to Thermo Fisher the mix contains only sesame seed, hazelnut, tomato, kiwi and cashew.

Food Mix Panel (fx77): sources

Thermo Fisher Scientific, ImmunoCAP Allergen fx77, Food, article 14-4988-01, product catalogue, geraadpleegd 2026-10-11 (retrieved 2026) thermofisher.com
NHG, Thuisarts.nl: Ik denk dat ik niet tegen bepaald voedsel kan, laatst gewijzigd 1 juli 2026, geraadpleegd 2026-10-11 (retrieved 2026) thuisarts.nl

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