[Fatal ewe's milk-induced anaphylaxis: laboratory work-up].

Selective ewe's or goat's milk allergy without cow's milk allergy often presents as a severe picture. Diagnosis and follow-up are facilitated by the use of laboratory tests. Serum tryptase is elevated after mast cell degranulation. Combined determination of serum tryptase and immunoglobulin-E levels are particularly useful in the work-up of anaphylaxis, should it have been fatal. A case of ewe's milk allergy without cow's milk allergy and its laboratory work-up are reported.