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Cat Dander IgE
Lab test

Cat Dander IgE

Recommended for people with allergy symptoms around cats who want confirmation of IgE-mediated sensitization — and for those considering allergen immunotherapy, where a confirmed result is typically required before treatment begins. No fasting or antihistamine avoidance needed. Results reviewed by a General Medicine clinician.

Receive actionable insights and deep analysis—not just lab values– in as little as 48 hours

Clear guidance, and follow-up care available

Simple, online scheduling for labs and everything else

Most insurance accepted

Board-certified

No hidden fees

Available nationwide

Complete insights in as little as 48 hours

1

Book your test

Instantly schedule at 2,000+ labs nationwide, at a time that works for you. Most visits take 15 minutes or less, with both walk-ins and appointments available.

2

Get results in 48 hours

Your results are delivered quickly—and reviewed by medical professionals. You’ll get clear explanations, robust health insights, and recommended next steps tailored to your health needs.

3

Take action with physician guidance

Choose to review your results and manage your plan with a General Medicine physician—or simply use the insights on your own.

4

Track progress over time

Repeat annually to see trends, improvements, and new emerging risks or book individual tests that focus on your set goals

What is a Cat Dander IgE Test?

The Cat Dander IgE test measures specific IgE antibodies directed against Fel d 1 — the primary protein in cat dander responsible for allergic reactions. A positive result confirms IgE-mediated sensitization to cats, meaning the immune system has developed antibodies that trigger allergy symptoms upon exposure. This test is the most reliable way to confirm cat allergy through a simple blood draw.

Cat allergy confirmation

Detects the specific IgE antibodies your immune system produces in response to cat dander — confirming that your symptoms are driven by a true IgE-mediated allergic response rather than irritant sensitivity or another cause.

Symptom and exposure correlation

A positive result provides objective evidence linking cat exposure to symptoms like sneezing, nasal congestion, itchy eyes, skin reactions, or asthma — supporting both clinical decision-making and discussions about allergen avoidance and management strategies.

Immunotherary eligibility

A confirmed cat dander IgE result is typically required before starting allergen immunotherapy (allergy shots or sublingual drops) — the only treatment that can reduce sensitivity over time, potentially allowing continued cat ownership with significantly reduced symptoms.

What's included

Test type

Blood sample

Collection method

Venipuncture

Fasting

Not required

Results processing time

1 to 2 days

Cat Dander (e1) IgE

Measures your body’s allergic response to cat dander, a common trigger for allergy symptoms.

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We help you understand your options, connect you to the right clinicians, manage prescriptions, coordinate any needed evaluations, and keep an eye on your overall health along the way. It’s comprehensive care that looks at the full picture — your goals, your history, your lifestyle — and makes it simple to move forward with confidence.

Your care plan
Clinician
Virtual visit with clinician

Ongoing support, always available.

You’ll be supported by experienced clinicians who care for a wide range of health needs, from everyday concerns to more complex conditions.

Our clinicians track your progress over time and adjust your care as needed. If medication is prescribed, we’ll manage dosing and monitor for side effects. If lab testing is recommended, we review results and refine your plan accordingly. You’re never left to navigate care on your own.

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Order your lab test today.

Frequently Asked Questions

What does the Cat Dander IgE test measure?

The test measures IgE antibodies specifically directed against cat dander allergen (Fel d 1, the primary cat allergen). A positive result confirms IgE-mediated (allergic) sensitization to cats — meaning your immune system has produced antibodies that trigger allergy symptoms upon cat exposure.

Do I need to fast for this test?

No fasting is required. IgE antibody levels are not affected by food intake. You can eat and drink normally before your appointment.

Can I take antihistamines before the test?

Yes — antihistamines do not affect blood-based IgE testing (unlike skin prick testing, which requires antihistamine avoidance). You can take antihistamines normally before this blood draw without affecting your result.

What if I have symptoms around cats but my IgE comes back normal?

A negative IgE to cat dander doesn't rule out all reactions to cats. Some people have non-IgE-mediated reactions or are sensitized to components of cat dander not captured by standard testing. A clinician can review your result alongside your symptom history to guide next steps.

If my result is positive, does that mean I need to give up my cat?

Not necessarily — allergen immunotherapy (allergy shots or sublingual drops) can desensitize you to cat allergen over time, significantly reducing symptoms and potentially allowing continued cat ownership. A positive result is the starting point for a broader conversation about management options.
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