Condition | Serum total tryptase level (ng/ml) | Comments |
---|---|---|
Healthy | 1–11 | Level is primarily genetically determined |
Mastocytosis | >20 | Levels <20 do not rule out mastocytosis, particularly in patients who have had systemic anaphylaxis to an insect sting |
Anaphylaxis | >[2 + (1.2*baseline level)] | Acute serum within 4 h of event onset; baseline serum either before acute event or >24 h after all signs and symptoms resolve |