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Test Code USNU Ustilago nuda, Mold Grain Rust, IgE, Serum


Ordering Guidance


For a listing of allergens available for testing, see Allergens – Immunoglobulin E (IgE) Antibodies



Specimen Required


Container/Tube:

Preferred: Red top

Acceptable: Serum gel

Specimen Volume: 0.5 mL for every 5 allergens requested


Useful For

Establishing the diagnosis of an allergy to Ustilago nuda, Mold Grain Rust, IgE

 

Defining the allergen responsible for eliciting signs and symptoms

 

Identifying allergens:

- Responsible for allergic disease and/or anaphylactic episode

- To confirm sensitization prior to beginning immunotherapy

- To investigate the specificity of allergic reactions to insect venom allergens, drugs, or chemical allergens

 

Testing for IgE antibodies is not useful in patients previously treated with immunotherapy to determine if residual clinical sensitivity exists, or in patients in whom the medical management does not depend upon identification of allergen specificity.

Method Name

Fluorescence Enzyme Immunoassay (FEIA)

Reporting Name

Ustilago Nuda, Mold Grain Rust, IgE

Specimen Type

Serum

Specimen Minimum Volume

For 1 allergen: 0.3 mL
More than 1 allergen: (0.05 mL x number of allergens) + 0.25 mL dead space

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 14 days
  Frozen  90 days

Reject Due To

Gross hemolysis OK
Gross lipemia OK

Reference Values

Class

IgE kU/L

Interpretation

0

<0.35

Negative

1

0.35-0.69

Equivocal

2

0.70-3.49

Positive

3

3.50-17.4

Positive

4

17.5-49.9

Strongly positive

5

50.0-99.9

Strongly positive

6

≥100

Strongly positive

Reference values apply to all ages.

Day(s) Performed

Monday through Friday

Report Available

Same day/1 to 3 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information

86003

LOINC Code Information

Test ID Test Order Name Order LOINC Value
USNU Ustilago Nuda, Mold Grain Rust, IgE 46721-7

 

Result ID Test Result Name Result LOINC Value
USNU Ustilago Nuda, Mold Grain Rust, IgE 46721-7