Tryptase
What this test measures
Tryptase is an enzyme released by mast cells, the cells that drive severe allergic reactions. A baseline level and a level taken during a reaction are compared.
Why doctors request it
Measured after a suspected severe allergic reaction (anaphylaxis) and in a rare condition where mast cells are too numerous.
What commonly pushes it up
- A recent severe allergic reaction, peaking one to two hours after it
- Mast cell conditions
- Kidney disease and some blood disorders
- An inherited trait that raises baseline tryptase
What commonly pushes it down
- There is no meaningful low value
Everyday reasons for a value outside the range
- Timing after a reaction is everything: too early or too late and it reads normal
- A raised baseline is often inherited and harmless
About the sample
During a reaction: one to two hours after it starts, then a baseline sample at least a day later.
Upload a photo or PDF and see every line against the range your lab printed, explained in plain English. First report free.
Read my report freeThis is an educational summary of results you uploaded. It is not medical advice, a diagnosis or a treatment plan, and it does not replace the doctor who requested the test. If you are worried, or a result is marked outside range, discuss it with your doctor. Written and reviewed by a UK consultant physician. Reference ranges vary between laboratories.