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25669 Allergen, Crayfish, IgE (CRAY)

Allergen, Crayfish, IgE (CRAY)
Test Code: ALCRYSO
Synonyms/Keywords
​Astacus astacus, Crawfish, Fish, crayfish
Useful For

Establishing the diagnosis of an allergy to crayfish

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.

Specimen Requirements
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
​Serum ​Serum Separator Tube (SST) Red Top Tube (RTT) ​0.5 mL for every 5 allergens requested
​ For 1 allergen: 0.3 mL/For more than 1 allergen: (0.05 mL x number of allergens) + 0.25 mL dead space
 ​
Specimen Stability Information
Specimen Type Temperature Time
​Serum ​ ​Refrigerated (preferred) ​14 days
​Frozen ​90 days
Performing Laboratory Information
Performing Location Day(s) Test Performed Report Available Methodology/Instrumentation
​Mayo Clinic Laboratories ​Monday through Friday 1 to 3 days ​Fluorescence Enzyme Immunoassay (FEIA)
Reference Lab
Mayo Clinic Laboratories
Reference Range Information

Performing LocationReference Range













​Mayo Clinic Laboratories
ClassIgE kU/LInterpretation
0<0.10Negative
0/1 0.10-0.34Borderline/equivocal
10.35-0.69Equivocal
20.70-3.49Positive
33.50-17.4Positive
417.5-49.9Strongly positive
550.0-99.9Strongly positive
6> or =100Strongly positive

Reference values apply to all ages.


Interpretation
​Detection of IgE antibodies in serum (Class 1 or greater) indicates an increased likelihood of allergic disease as opposed to other etiologies and defines the allergens that may be responsible for eliciting signs and symptoms.
 
The level of IgE antibodies in serum varies directly with the concentration of IgE antibodies expressed as a class score or kU/L.
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​86003 ​ ​ ​ ​
Synonyms/Keywords
​Astacus astacus, Crawfish, Fish, crayfish
Ordering Applications
Ordering Application Description
​Cerner​Allergen, Crayfish, IgE (CRAY)
​COM​Allergen, Crayfish, IgE (CRAY)
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
​Serum ​Serum Separator Tube (SST) Red Top Tube (RTT) ​0.5 mL for every 5 allergens requested
​ For 1 allergen: 0.3 mL/For more than 1 allergen: (0.05 mL x number of allergens) + 0.25 mL dead space
 ​
Specimen Stability Information
Specimen Type Temperature Time
​Serum ​ ​Refrigerated (preferred) ​14 days
​Frozen ​90 days
Useful For

Establishing the diagnosis of an allergy to crayfish

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.

Reference Range Information

Performing LocationReference Range













​Mayo Clinic Laboratories
ClassIgE kU/LInterpretation
0<0.10Negative
0/1 0.10-0.34Borderline/equivocal
10.35-0.69Equivocal
20.70-3.49Positive
33.50-17.4Positive
417.5-49.9Strongly positive
550.0-99.9Strongly positive
6> or =100Strongly positive

Reference values apply to all ages.


Interpretation
​Detection of IgE antibodies in serum (Class 1 or greater) indicates an increased likelihood of allergic disease as opposed to other etiologies and defines the allergens that may be responsible for eliciting signs and symptoms.
 
The level of IgE antibodies in serum varies directly with the concentration of IgE antibodies expressed as a class score or kU/L.
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Report Available Methodology/Instrumentation
​Mayo Clinic Laboratories ​Monday through Friday 1 to 3 days ​Fluorescence Enzyme Immunoassay (FEIA)
Reference Lab
Mayo Clinic Laboratories
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​86003 ​ ​ ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.