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

Rhizopus nigricans Allergy (IgE)

Measures IgE to Rhizopus nigricans, a mold, from a single 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

Molds such as Rhizopus nigricans release spores into the air, and this blood test measures IgE antibodies to this one. It is found on bread, fruit, and compost. 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?

For adults who want to check for sensitization to the mold Rhizopus nigricans, often when symptoms flare in damp spaces or during mold season, or before seeing an allergist.

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?

The result shows your level of IgE to the mold Rhizopus nigricans, one piece of information an allergist or other healthcare provider reads with your symptoms and history.

Rhizopus nigricans-specific IgE (m11)
IgE is the antibody involved in allergic reactions. This marker is the amount of IgE in your blood that recognizes the mold Rhizopus nigricans, reported in kU/L. A level above the lab’s reference range means sensitization, not necessarily allergy.
Why it’s measured: To see whether you are sensitized to the mold Rhizopus nigricans, read with your history.

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 IgE level is reported in kU/L and compared with the lab’s reference range. A result above the range means sensitization, not necessarily allergy.

  • 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

An allergist or other healthcare provider reads this result with where and when your symptoms happen, and decides on next steps.

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.

No. Sensitization means your body has made IgE to Rhizopus nigricans. An allergy means that exposure causes symptoms. Many people are sensitized without having symptoms, so a positive result alone does not mean you are allergic.

A negative result does not clear an allergy either. An allergist or other healthcare provider reads your result with what happens when you are exposed.

No. This test measures IgE antibodies to Rhizopus nigricans 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.

Rhizopus nigricans is found on bread, fruit, and compost. 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.

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.