grass pollen allergen extract at a glance
Type
Diagnostic allergen preparation for skin-prick testing
Allergen source
Timothy grass pollen
Administration
Applied to healthy skin and introduced superficially with a sterile lancet by a trained healthcare professional
Result
A wheal-and-flare response indicates sensitisation and must be interpreted alongside clinical history and controls
What is grass pollen allergen extract used for?
Its licensed use is diagnostic, not therapeutic.
Diagnosing specific IgE-mediated allergic disease where sensitivity to Timothy grass pollen is suspected.
Supporting allergy assessment alongside symptoms, exposure history and test controls.
How does grass pollen allergen extract work?
In a sensitised person, grass pollen allergens bind to allergen-specific IgE on skin mast cells. This releases substances including histamine, producing a raised, red wheal-and-flare response that is compared with test controls.
How to take grass pollen allergen extract
This preparation is not swallowed or self-administered. Testing is performed by a trained healthcare professional in a clinic equipped to manage anaphylaxis.
The test uses clean, dry, healthy skin, usually on the forearm; the back may sometimes be used.
A drop is placed on the skin and the surface is gently pricked with a new sterile lancet.
The solution is removed and the skin response is measured against test controls.
Follow the clinic’s instructions about medicines and skin products before attending.
grass pollen allergen extract side effects
Common or expected effects
- Local itching, redness, swelling, rash, warmth, irritation, discomfort or a firm raised area beyond the expected test wheal.
Get urgent medical advice
- Anaphylaxis, including breathing difficulty, widespread hives, dizziness or fainting.
- Rapid swelling of the face, mouth or throat.
- New or worsening asthma symptoms, including wheezing or breathlessness.
grass pollen allergen extract in pregnancy
Evidence during pregnancy is limited. It should not be used unless the treating physician considers that the diagnostic benefit outweighs the risks, including a possible systemic allergic reaction.
grass pollen allergen extract while breastfeeding
Clinical breastfeeding data are unavailable, but effects on the breastfed infant are not anticipated because systemic exposure from skin-prick testing is negligible. Tell the clinician if you are breastfeeding.
grass pollen allergen extract interactions
Some medicines can suppress the skin response or complicate treatment of a rare severe reaction. Follow the clinic’s instructions and do not stop prescribed medicines without advice.
Antihistamines
May suppress the immediate skin response and cause a false-negative result.
Potent topical corticosteroids on the test area
May suppress the local response and make the result unreliable.
Systemic corticosteroids
Higher or prolonged exposure may reduce skin reactivity, so treatment history must be considered.
Common questions about grass pollen allergen extract
Answers are fully visible for fast scanning and source review.
Is this an allergy treatment?
No. This formulation is a diagnostic test preparation and does not treat hay fever or desensitise someone to grass pollen.
What does a positive test mean?
It indicates sensitisation to Timothy grass pollen. Symptoms and exposure history must also be considered before diagnosing clinically relevant allergy.
Sources
These sources were used to prepare and review this medicine page.
Prepared and reviewed by the iatroX editorial team.