Corn Smut (Ustilago) Allergy Test
Corn Smut (Ustilago) Allergy Test can be requested without a referral, and this overview covers what to expect. The corn smut (Ustilago) allergy test is a blood test that checks for allergic sensitization to corn smut, a fungus that grows on corn. It is usually ordered when a person has allergy symptoms that may be linked to corn or corn-based products, or when other tests have not found a clear cause.
- Sample type
- blood
- Category
- Allergy
- Turnaround
- 1-3 business days
- Price
- $49
- Referral
- Not required
The corn smut (Ustilago) allergy test is a blood test that checks for allergic sensitization to corn smut, a fungus that grows on corn. It is usually ordered when a person has allergy symptoms that may be linked to corn or corn-based products, or when other tests have not found a clear cause.
What it measures
- Ustilago-specific IgE — Antibodies that can trigger allergic reactions to corn smut.
- Total IgE — A general measure of allergic tendency, sometimes included for context.
- Other mold-specific IgE — May be checked to see if symptoms are due to other molds.
Who it is for
This test is typically ordered by an allergist or primary care clinician for people with unexplained allergy symptoms, especially those who handle or eat corn products.
Preparation
No fasting or special preparation is needed. The blood sample can be taken at any time of day.
Results and what they mean
Results are reported as a level of specific IgE, often as a number or class. A clinician interprets the result along with your symptoms and history; a positive test alone does not mean you have an allergy. This is general information only and not medical advice.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the corn smut (ustilago) allergy test is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
What is corn smut?
Corn smut is a fungus that can grow on corn. Its spores may cause allergic reactions in some people.
Does a positive result mean I am allergic to corn?
Not necessarily. A positive result shows sensitization, but only a clinician can determine if you have a true allergy.
How long do results take?
Results are usually available within 1 to 3 business days.
Is this test painful?
It is a standard blood draw, which may cause brief discomfort.