What kind of test is E893 Mast cell Tryptase for 5 year old...what are they looking for...thanx   ?

Allergy react eval. tryptase is an enzyme that is released in the body only by mast cells. This can happen during an allergic reaction, with systemic mastocytosis or with Mast cell activation syndrome (MCAS). if your five-year-old had a reaction then, measuring Tryptase within 2 to 4 hours after the reaction would give your doctors a clue if it truly was mast cell related. I don’t know what E 893 is.
Mast cell Tryptase. Is looking for an allergic reaction. The setting it is done is when there is a possible allergic reaction and to see if the markers are elevated. It is repeated at a later time to see if they normalize.