A patient seated in the chair before a blood draw
In person

Alternaria alternata Allergy (IgE)

IgE antibodies to the mold Alternaria alternata, from one blood draw.

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  • 2,000+ lab locations. Find one near you
  • Nothing due at the lab. FSA / HSA accepted
  • Ordered by a licensed clinician

At a glance

Collection
Blood draw
A standard blood draw at the lab.
Preparation
None
Nothing to do ahead of time. Water is fine.
Results
3 to 5 days
Typical turnaround after your visit.
Where
2,000+ lab locations
Nationwide, with nothing due at the lab.

About this test

This test measures IgE antibodies to the mold Alternaria alternata. It is found outdoors on plants and soil, peaking in late summer and fall. A positive result shows sensitization, which is not the same as an allergy. There is nothing to do ahead of your visit.

For adults 18 and older. Test availability varies by lab location.

Who should take this test?

Adults often use it when symptoms seem worse in damp spaces or in mold season, or before an allergist visit, to check sensitization to Alternaria alternata.

Ask about this test

Not sure this is the right test?

AI-generated. For information only, not medical advice. Call 911 for an emergency.

What does this test measure?

Your result shows whether your blood has IgE to Alternaria alternata. Read with where and when your symptoms happen, it can help a healthcare provider see whether this mold may play a part.

Alternaria alternata-specific IgE (m6)
Specific IgE is an antibody the immune system can make against one allergen. This marker measures IgE that recognizes Alternaria alternata, a mold found outdoors on plants and soil, peaking in late summer and fall. A level above the lab’s reference range shows sensitization.
Why it’s measured: Checks for IgE sensitization to Alternaria alternata when symptoms seem linked to mold.

How it works

  1. Step 1

    Order online

    Check out here. A licensed clinician in your state reviews your order and sends it to the lab.

  2. Step 2

    Visit a lab

    Bring a photo ID to any of 2,000+ lab locations. No fasting needed, and nothing is due at the lab.

  3. Step 3

    Get your results

    Results post to your account, usually in 3 to 5 days, each number next to the lab’s reference range.

Find a lab near you

Choose from 2,000+ lab locations nationwide. Your order works at any of them.

What your results tell you

Your result is reported as an IgE level in kU/L and compared with the lab’s reference range. A level above the range shows sensitization.

  • Your number next to the lab’s reference range
  • Explained in plain language
  • A licensed clinician reviews your order and, if appropriate, orders the test.
  • A lab report you can download and share

Decisions about mold exposure or care belong with an allergist or other healthcare provider, who reads this result with your history.

Clinical-grade testing, from the comfort of home.

From the lab to your report, every step of our process meets the gold standard in medical testing.

  • CLIA-certified labs

    Every lab we partner with is certified under the Clinical Laboratory Improvement Amendments, meeting both state and federal standards with regular independent inspections.

  • We protect your health data

    We protect your health data with encryption and do not sell it. Some results must be reported to public health authorities by law. See our Privacy Notice.

  • Rigorous quality assurance

    All partner labs run regular internal quality checks, participate in proficiency testing, and comply with federal and state lab regulations.

  • Clinician-reviewed reports

    Results are reviewed by an independent, licensed clinician.

Questions

Common questions.

Anything else, our care team answers by phone, text, or email.

Not on its own. A positive result means your immune system has made IgE to Alternaria alternata, which is called sensitization. Many people who are sensitized have no symptoms when they are exposed.

A diagnosis of allergy is made by a healthcare provider who looks at your symptoms and history along with results like this one. A negative result also does not by itself mean you are not allergic.

No. This test measures IgE antibodies to Alternaria alternata in your blood. It does not measure mold in your home or workplace, and it is not a test for mold toxins.

A positive result shows sensitization to this mold, which an allergist or other healthcare provider reads with your symptoms and where they happen.

Alternaria alternata is found outdoors on plants and soil, peaking in late summer and fall. Molds release spores into the air, and those spores carry the allergens this test looks at.

Knowing where a mold grows can help you and a healthcare provider think about when and where symptoms happen. A result alone does not show where your exposure comes from.

Yes. Alternaria alternata is one of the allergens in the Southwest allergy evaluation, the mid-⁠Atlantic regional panel, the Rocky Mountain states panel, the southern Plains panel, and the Southern regional panel. Each panel measures IgE to a set of allergens the lab groups together, in one draw.

Each result in a panel is read the same way: sensitization is not the same as allergy, and an allergist reads it with your history.

Lab tests are informational and don’t diagnose conditions on their own. Available to adults 18 and older; test availability varies by lab location. A licensed clinician reviews your order and, if appropriate, orders the test. All testing is performed at CLIA-certified laboratories. Not for emergencies: if you think you may be having a medical emergency, call 911.