Test library
Tryptase Level Test
The Tryptase Level Test measures tryptase, an enzyme released by mast cells, in a blood sample. It is used to evaluate severe allergic reactions and to help diagnose mast cell disorders such as mastocytosis.
Order Tryptase Level Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Tryptase Level Test- Typical turnaround
- 1-3 business days
- Starting price
- From $119
- Results
- Confidential, online
Quick answer
The Tryptase Level Test measures the amount of tryptase in the blood. Tryptase is released by mast cells, immune cells that play a central role in allergic reactions. A high level can accompany a severe reaction, and persistently elevated levels can point toward a mast cell disorder. The test is interpreted by a qualified healthcare provider alongside symptoms and timing.
What this test measures
Mast cells are found in tissues throughout the body and release mediators such as histamine and tryptase when they are activated. Tryptase is more specific to mast cells than histamine is, which makes it a useful marker in allergy and mast cell evaluations. Levels can rise during a severe reaction and then fall again over hours.
Blood is drawn from a vein, and the sample is analyzed with an immunoassay. Timing matters: a sample collected during or shortly after a severe reaction is interpreted differently from a baseline sample taken when a person is well. When a mast cell disorder is suspected, a baseline level and sometimes a comparison over time are used.
Clinicians order tryptase testing to investigate severe allergic reactions of unknown cause, to evaluate suspected mastocytosis, and to monitor people with a known mast cell condition. A normal result does not rule out allergy, and an abnormal result does not confirm a specific trigger. The test fits into a broader evaluation.
- Serum tryptase (total)
- Mature beta-tryptase
- Alpha-tryptase
- Baseline tryptase level
- Peak tryptase level after a reaction
- Total serum IgE
- Histamine when included in the same order
Why people order this test
- Evaluate a severe allergic reaction of unknown cause
- Support the workup of suspected mastocytosis
- Monitor a known mast cell disorder over time
- Establish a baseline tryptase level
- Investigate recurrent flushing, hives, or low blood pressure
- Follow up after a reaction without an obvious trigger
How to prepare
No fasting is usually required. Tell the laboratory and ordering provider about the timing of any recent reaction and about current medications, since both can affect interpretation. A baseline sample is often collected when you are well.
Understanding your results
Results are typically available within one to three business days. A tryptase level is compared with the laboratory reference range and with any earlier values. Elevated results can occur with severe allergic reactions or mast cell disorders, and a qualified healthcare provider interprets them in context.
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Frequently Asked Questions
What is tryptase?
Tryptase is an enzyme stored in mast cells. It is released when mast cells are activated, so it can serve as a marker of mast cell involvement in a reaction.
When should the sample be collected?
The timing depends on the question being asked. A sample shortly after a reaction is used differently from a baseline sample taken while a person is well, and the laboratory provides specific guidance.
Does a normal tryptase rule out allergy?
No. Tryptase is one part of an evaluation. Allergies can be present with a normal tryptase level, and other testing may be needed.
What is mastocytosis?
Mastocytosis is a condition in which mast cells accumulate in tissues. Tryptase testing is one tool clinicians use when evaluating it, along with symptoms and other studies.
Can medications affect tryptase results?
Some medications may influence results. Sharing a complete medication list with the ordering provider helps ensure accurate interpretation.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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