Allergen checking for infants varies according to the checking methods. Generally, the in vitro test can be conducted after one month and the in vivo test can be conducted after the baby is four years old.
1. In vitro test: It refers to the clarification of allergens by checking blood or body fluids. The commonly used clinical method is to draw blood to check the specific IgE of various allergens, which can be performed when babies have allergic symptoms such as recurrent eczema or rashes, or when there is suspicion of allergy, and can be performed on babies more than one month after birth.
2. In vivo test: it refers to the skin prick test to clarify the allergy situation, and is usually conducted after the baby is four years old to avoid anaphylactic shock and other adverse reactions due to the baby’s young age and high allergenicity.