Cat Allergy Test London | Fel d1 IgE
Cat allergy testing uses specific IgE blood testing and, where relevant, component-resolved interpretation. Our nurse-led clinic provides sample collection and laboratory reporting. We are diagnostic-only: diagnosis and treatment decisions remain with your GP or specialist.
Safety note
If severe breathing symptoms or suspected anaphylaxis occur, call 999 immediately. Blood testing is not an emergency service.
Fel d components: Fel d1, Fel d2, Fel d4
Component-resolved testing can improve specificity compared with extract-only results. Fel d1 is the major cat allergen for many sensitised patients.
| Component | Type | General interpretation context |
|---|---|---|
| Fel d1 | Secretoglobin | Major cat allergen in many cat-allergic patients |
| Fel d2 | Serum albumin | May indicate broader albumin cross-reactivity context |
| Fel d4 | Lipocalin | Can add component-level detail in specialist interpretation |
Component testing vs Total IgE
- • Component testing (Fel d markers) is allergen-specific.
- • Total IgE is a broad background marker and not trigger-specific.
- • Both require clinical interpretation with history and symptom timing.
Cat Components Test
IgE component testing including Fel d markers where available.
View test →Total IgE
Non-specific baseline marker used as supporting context.
View test →Frequently asked questions
What does a cat allergy blood test measure?
It measures specific IgE sensitisation to cat allergens. A positive result indicates sensitisation and must be interpreted with your symptom history by your GP or specialist.
What are Fel d1, Fel d2 and Fel d4?
They are cat allergen components. Fel d1 is the major cat allergen in most cat-allergic patients. Fel d2 (cat serum albumin) and Fel d4 (lipocalin) can add detail in component-resolved interpretation.
Is component testing better than total IgE?
They answer different questions. Component testing is allergen-specific and can improve clinical clarity. Total IgE is a non-specific background marker and does not identify the trigger by itself.
Can this test confirm diagnosis on its own?
No. This is a diagnostic support test. Diagnosis and management decisions require clinical assessment by your GP or allergy specialist.