Allergy Diagnosis and Tests: Finding Your Triggers

Allergy Diagnosis and Tests: Finding Your Triggers

Treating "allergy" without knowing the trigger is guesswork. Diagnosis has one job: identify exactly what you react to, so avoidance and treatment can be precise instead of broad and miserable.

The Workup, Step by Step

1. History first - always. The pattern is the biggest clue: what, when, how fast, how severe, what relieved it. A doctor will ask about foods, seasons, rooms, products, and family history. A symptom-and-exposure diary for 2-4 weeks sharpens this enormously.
2. Skin prick test: tiny drops of allergen extracts on the forearm, pricked through; a wheal within 15-20 minutes flags sensitisation. Fast, cheap, and the workhorse of allergy clinics.
3. Specific IgE blood tests: measure antibodies to individual allergens - useful when skin testing is impractical or antihistamines cannot be stopped.
4. Patch testing: for delayed contact dermatitis (cosmetics, metals) - patches worn on the back for 48 hours.
5. Supervised challenge: eating the suspect food under medical observation - the gold standard when history and tests disagree.
6. For rhinitis and asthma: nasal examination, sometimes endoscopy; spirometry for the chest.

What Not to Waste Money On

• IgG "food intolerance" panels: not validated for allergy; major allergy societies advise against them
• Hair analysis, Vega machines, applied kinesiology: no evidence
• Broad test bundles without history: positive tests without matching symptoms are sensitisation, not allergy - they mislead more than they guide

The Classical Diagnostic Approach

Classical Ayurveda diagnosed through Trividha Pariksha - inspection (Darshana), touch (Sparshana), and detailed questioning (Prashna) - then mapped findings onto dosha, digestion (Agni), and Ama. For Sheetapitta and Pratishyaya the texts instruct examination of lesion character, discharge quality, triggers like cold wind, dietary history including incompatible combinations, and the state of digestion.

Two classical habits are worth keeping verbatim: the meticulous exposure-and-diet history, and the insistence on examining the whole person rather than one rash. But the texts could not name a single allergen - that capability belongs entirely to modern testing, per NHS allergies guidance.

Frequently Asked Questions

Is skin prick testing painful? It feels like tiny scratches - mildly itchy if positive, over in 20 minutes. Even small children tolerate it.

Do I need to stop antihistamines before testing? Yes, typically 3-7 days before skin prick tests (they suppress results). Blood IgE tests are unaffected.

Can tests tell how severe my allergy is? No - tests show sensitisation, not severity. History of actual reactions is the severity guide.

If my test is negative, am I safe? For that allergen, largely - but no test is perfect. A strong clinical history outweighs a negative test and warrants specialist review.