Fresno:7407 N Cedar Ave # 102, Fresno, CA 93720(559) 369-4421Fax (559) 369-4418
Merced:105 W El Portal Dr, Suite B, Merced, CA 95348(209) 349-8526Fax (209) 349-8518
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Allergy testing

Allergy testing & treatment in Fresno & Merced, CA

Reactions are easier to manage once you know what's behind them. We use skin and blood testing — for environmental, food, drug, insect venom, and vaccine-component allergies — to identify your triggers, then work with you on a plan designed to help.

Skin & blood testingOften same-day resultsKids & adults
Allergy testing in Fresno & Merced, CA
What we test for

A starting point for almost any allergy question

Medication reactions

Drug & medication allergy testing

A suspected reaction to an antibiotic (such as penicillin) or another medication doesn't always mean a true allergy — and assuming one can limit your treatment options later. We review your history and, when appropriate, test to help confirm or rule out a specific drug allergy, so future choices about your care can be made with clearer information.

Vaccine reactions

Vaccine allergy evaluation

A reaction that happened around the time of a vaccine doesn't always mean the vaccine itself was the cause. We review what happened and, when indicated, test for specific vaccine components — giving you and your care team clearer information for future vaccinations.

What to expect

A clear path from testing to a plan

1

Consultation

We review your history and symptoms to decide which testing makes sense.

2

Testing

Skin testing takes about 20 minutes; blood testing is a simple draw.

3

Results & plan

We walk you through what we found and build a plan together.

4

Follow-up

We check in as your plan takes shape and adjust through the seasons.

FAQs

Frequently asked questions

Does skin testing hurt?

Most people describe it as mild and brief — a series of tiny pricks. Any itching usually settles within an hour.

How should I prepare?

Avoid antihistamines for several days before testing if you can — we'll give you specific guidance when you book.

Can you test for a penicillin allergy?

Yes — drug allergy testing, including for penicillin, is available. We'll walk through your reaction history first to decide on the right approach.

I had a reaction near a vaccine — can that be tested?

Often, yes. We review the reaction and can test for specific vaccine components when it's indicated.

Is testing covered by insurance?

We work with most major plans. Contact our office and we'll help you verify coverage.

Let's find your triggers.

Book a visit and we'll work with you to understand what's going on and build a plan designed to help.

General information only — not medical advice. Please consult a qualified provider for assessment. Sierra Allergy works with many insurance plans; contact us to verify your coverage.