Skip to content

Citrus Mix-Specific IgE Antibodies, Serum — Radioallergosorbent Test (RAST)

Published: August 9, 2026Updated: August 17, 2026

A blood test that checks for IgE antibodies to citrus allergens, which can help evaluate a possible citrus allergy.

Quick summary

["Detecting citrus-specific IgE suggests an immune sensitization, but your symptoms and medical history are needed to determine whether you have an allergy."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
82067-0
Short code
Citrus mix IgE RAST
Synonyms
Citrus mix IgE RAST
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
10
Ref high
40
Critical range
— – 500 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
multidisk
CPT
84484
SNOMED
302774002
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test?

This blood test measures immunoglobulin E (IgE) antibodies directed against proteins found in citrus fruits. These antibodies are part of the immune response that can occur with an allergy to citrus.

Why might I need this test?

Your clinician may order this test if you develop symptoms such as hives, itching, swelling, wheezing, or digestive discomfort after eating citrus fruits. It may be used to help identify whether citrus is a possible trigger.

How is the test performed?

A blood sample is collected from a vein and analyzed in a laboratory for citrus-specific IgE antibodies. The result is reported as a concentration or with a laboratory interpretation.

How do I prepare for the test?

No special preparation is usually needed. Tell your clinician about any medicines you take, particularly antihistamines, because they may affect allergy testing; do not stop prescribed medicines without medical advice.

Reference range

Adult: 10-40 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Citrus Mix IgE Antibodies, Serum

Frequently asked questions

Does a positive result mean I am allergic to citrus?
Not necessarily. It shows that citrus-specific IgE antibodies are present, but your clinician must interpret the result along with your symptoms, exposure history, and sometimes other allergy tests.
What symptoms can a citrus allergy cause?
Possible symptoms include hives, itchy skin or mouth, swelling, wheezing, coughing, nausea, vomiting, or abdominal pain. Severe reactions can occur but are not expected in every person with a positive test.
Should I avoid citrus if this test is positive?
Ask your clinician or allergist for guidance before making major dietary changes. A positive result may identify a trigger, but symptom history is needed to confirm its clinical importance.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 17, 2026. · Read our editorial policy