Skip to content

Latex-Specific IgE (rHev b3), Qualitative (RAST) — Deprecated

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

A blood test that detects IgE antibodies to rHev b3, a latex allergen, indicating possible latex sensitization.

Quick summary

["A positive result indicates sensitization to latex, but it must be interpreted alongside symptoms and exposure history."]

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

Key facts at a glance

LOINC
82011-8
Short code
Deprecated Latex (rHev b) 3 IgE RAST Ql
Synonyms
Deprecated Latex (rHev b) 3 IgE RAST Ql
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
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 test measures latex-specific IgE antibodies in blood using a radioallergosorbent test, or RAST. It targets rHev b3, a recombinant allergen derived from natural rubber latex. This is a deprecated test and may not be readily available.

Why might I need this test?

It may be considered when a person has a suspected latex allergy, particularly after reactions during surgery, medical procedures, or exposure to latex gloves, catheters, or other rubber products. The result is used with the medical history to assess whether latex sensitization is likely.

How is the test performed?

A blood sample is collected and tested for IgE directed against the rHev b3 latex allergen. Because this assay is deprecated, a laboratory may use another validated allergy test when appropriate.

How do I prepare for the test?

No fasting or special preparation is usually required for a blood draw. Tell your clinician about any suspected latex reactions, recent latex exposure, and other allergies. Do not deliberately expose yourself to latex before testing.

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

Latex-Specific IgE

Frequently asked questions

Does a positive result mean I am allergic to latex?
It indicates latex sensitization, but not every sensitized person has symptoms. Your clinician will interpret the result with your exposure history and symptoms.
What is rHev b3?
rHev b3 is a recombinant form of a latex allergen made from the rubber tree Hevea brasiliensis. It is one of the proteins that can trigger an immediate latex allergy.
Why is this test listed as deprecated?
Deprecated tests are no longer routinely recommended or may have been replaced by other testing methods. Ask your clinician about the currently available option if latex allergy is a concern.
  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