Tryptase
Private Unsaturated Iron Binding Capacity testing in London for £43, measuring one iron-transport marker with results expected in around 1–2 days.
Turnaround time
1-2 business days
Biomarkers count
1
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Overview of the Tryptase Test
The Tryptase blood test measures Tryptase, a protein stored predominantly within mast-cell granules and released when mast cells become activated.
The test assesses 1 specialist biomarker: Tryptase.
Mast cells participate in allergic and immune responses.
During significant systemic activation, including some episodes of anaphylaxis, Tryptase can be released into the bloodstream and temporarily increase.
This makes timed Tryptase testing useful when clinicians are trying to establish whether mast-cell activation occurred during a suspected anaphylactic reaction.
Timing is critical.
Tryptase may not rise immediately and typically reaches its highest concentration within the first few hours after a reaction.
For suspected anaphylaxis, emergency treatment always takes priority.
A blood sample may be taken as soon as practical after treatment has started, followed by another sample ideally within 1–2 hours of symptom onset and no later than 4 hours.
A later baseline sample is often needed after the reaction has completely resolved.
Tryptase can also be persistently elevated outside an acute allergic reaction.
Higher baseline concentrations can occur with systemic mastocytosis, hereditary alpha-tryptasaemia and other mast-cell disorders.
A raised baseline result does not diagnose these conditions by itself.
Further allergy, haematology or immunology assessment may be required.
A normal acute Tryptase result does not completely exclude anaphylaxis.
This is particularly important because some genuine reactions, including some food-triggered anaphylaxis, may not produce a large measurable rise.
What Does the Tryptase Test Check?
The test measures circulating Tryptase associated with mast-cell activity. This test measures 1 specialist biomarker.
Tryptase
Measures a mast-cell protein that can increase transiently during systemic mast-cell activation and remain elevated in selected mast-cell disorders.
Who May Benefit From the Tryptase Test?
Tryptase testing is useful after selected severe allergic reactions and during investigation of persistently increased mast-cell activity.
People assessed after suspected anaphylaxis - Timed Tryptase samples can provide biochemical support for mast-cell activation.
People with unexplained recurrent severe allergic-type reactions - Baseline and acute measurements can provide useful information.
People with recurrent unexplained fainting, flushing or systemic reactions - Mast-cell disorders can form part of specialist investigation.
People with a previously elevated baseline Tryptase - Repeat testing can determine whether elevation persists.
People with suspected systemic mastocytosis - Baseline Tryptase is one element of the broader assessment.
People undergoing investigation for hereditary alpha-tryptasaemia - Persistent baseline elevation can prompt further evaluation.
People referred by an allergist or immunologist - Specialist interpretation is particularly important.
People needing a baseline sample after a previous suspected anaphylactic episode - Comparison with an acute result can improve interpretation.
How to Prepare
Emergency treatment always comes before blood sampling.
A single Tryptase result is less informative than appropriately timed acute and baseline measurements when anaphylaxis is being investigated.
Symptoms and Reasons to Consider the Tryptase Test
Mast-cell activation can produce rapid symptoms involving several organ systems.
A previous episode of suspected anaphylaxis - Timed blood sampling can support retrospective confirmation.
Sudden widespread hives with breathing or circulatory symptoms - Systemic mast-cell activation may occur.
Unexplained severe flushing with collapse or low blood pressure - Specialist mast-cell assessment may be appropriate.
Recurrent systemic reactions without a clear trigger - Baseline Tryptase can provide additional information.
A persistently elevated previous Tryptase result - Repeat baseline measurement can confirm the pattern.
Symptoms accompanied by a suspected mast-cell disorder - Tryptase can form part of specialist assessment.
Difficulty breathing, throat swelling, collapse or rapidly developing systemic allergic symptoms require immediate emergency treatment.
Tryptase testing must never delay adrenaline or resuscitation during suspected anaphylaxis.
How to Book Your Tryptase Test
The Tryptase test can be booked privately for baseline mast-cell assessment or clinician-directed follow-up after a suspected allergic reaction.
Choose the Tryptase
Select the individual Tryptase blood test online.
Select your sample collection option
Choose an in-clinic blood draw or professional home or hotel phlebotomy for non-emergency baseline testing where suitable.
Attend your appointment
A trained healthcare professional collects the venous blood sample and relevant symptom timing should be documented.
Laboratory analysis
Your serum undergoes measurement of Tryptase.
Receive your results securely
Your authorised result is delivered securely and can be compared with acute or baseline measurements where available.
When Will I Receive My Results?
The current London Blood Tests page lists a customer-facing turnaround of approximately 5–8 days after laboratory receipt.
The current price is £178.
The underlying referral laboratory may complete analytical processing sooner, but the live London Blood Tests turnaround has been retained for this page.
Understanding Your Results
A normal baseline Tryptase does not completely exclude a mast-cell disorder or a previous episode of anaphylaxis.
An acute rise compared with the person's baseline can support mast-cell activation during a suspected reaction.
Interpretation therefore depends not only on whether the value exceeds a fixed laboratory reference limit but also on how the acute result compares with baseline.
A persistently elevated baseline result can occur with systemic mastocytosis, hereditary alpha-tryptasaemia and other conditions.
Further investigation may be appropriate when elevation is persistent or clinically significant.
A normal result obtained after suspected anaphylaxis does not completely exclude the diagnosis.
The clinical features of the reaction remain fundamental.
Why Book With London Blood Tests?
London Blood Tests provides private Tryptase testing for allergy and mast-cell assessment.
Measures a key mast-cell marker - Tryptase provides biochemical information about mast-cell activity.
Useful after suspected anaphylaxis - Correctly timed samples can support retrospective confirmation.
Can establish a baseline level - Baseline testing provides essential context for an acute result.
Relevant to mastocytosis assessment - Persistently increased Tryptase can prompt specialist investigation.
Relevant to hereditary alpha-tryptasaemia - Baseline elevation can occur with increased alpha-tryptase gene copy number.
Can complement allergy testing - Tryptase addresses mast-cell activation rather than identifying the specific allergen.
Professional blood collection - Clinic and suitable home or hotel appointments are available for non-emergency testing.
Clear pricing - The Tryptase test costs £178.
Private Tryptase Blood Test in London
London Blood Tests provides private Tryptase testing for people requiring assessment of mast-cell activity.
The test costs £178 and measures 1 specialist biomarker.
The current customer-facing turnaround is approximately 5–8 days after laboratory receipt.
For suspected anaphylaxis, urgent medical treatment and correctly timed acute sampling are more important than routine private testing.