Egg yolk (f75)1063
Egg yolk is the most valuable part of the chicken egg, containing almost all the fats and only a small portion of the egg proteins. Up to 70% of the fats are rich in unsaturated fatty acids, including essential linoleic and arachidonic acids, as well as lecithin and phospholipids. The yolk also contains fat-soluble vitamins A, D, E, and carotene.
FEIA (Fluorescence Enzyme Immunoassay) – a fluorescent enzyme immunoassay that allows quantitative determination of sensitization levels.
- Diagnosis of allergic reactions.
- Assessment of sensitization levels and risk of allergy development.
- Monitoring the effectiveness of ongoing therapy.
- Evaluation of sensitization levels after allergen avoidance.
- Assessment of immune system status.
- Blood should be drawn in the morning on an empty stomach or 4 hours after eating.
- Drinking plain still water is allowed.
- Do not smoke for 30 minutes before the test.
- For children under 1 year – do not feed 30-40 minutes before the test; for children 1-5 years – 2-3 hours fasting.
Egg yolk is an obligate allergen that is not species-specific, so substituting with eggs from other birds does not eliminate the risk of an allergic reaction. The allergen can penetrate the body in an unchanged form through the intestinal barrier and plays an important role in the development of bronchial asthma, rhinitis, and atopic dermatitis. It is recommended to exclude chicken meat from the diet to avoid cross-reactivity. The allergenic properties of yolk and egg white differ, so testing should be conducted separately. Even minimal amounts of yolk can cause severe reactions, including anaphylactic shock. In case of egg allergy, vaccination should be avoided without consulting a doctor, as many vaccines are produced using chicken embryos.