Skip to content

Mold Allergen Mix 2 IgE (RAST), Serum

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

A blood test that detects IgE antibodies to mold allergens in a mixed allergen panel, helping evaluate possible mold sensitization.

Quick summary

["A positive result suggests an immune sensitization to one or more mold allergens in the tested panel."]

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

Key facts at a glance

LOINC
82083-7
Short code
Mold Allerg Mix2 IgE RAST
Synonyms
Mold Allerg Mix2 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 test measures allergen-specific IgE antibodies against a panel of molds known as Mold Allergen Mix 2. IgE is an immune-system antibody that can develop in response to a particular allergen.

Why might I need this test?

Your clinician may order it when symptoms such as sneezing, congestion, wheezing, or skin reactions could be related to mold exposure. It may also be used to help identify which mold allergens are likely triggers.

How is the test performed?

A blood sample is collected and tested in a laboratory for IgE antibodies to the mold allergens in the panel. The RAST name refers to the radioallergosorbent testing approach, although many laboratories use modern nonradioactive IgE assays.

How do I prepare for the test?

No special preparation is usually required. Tell your clinician about any medicines you take, including antihistamines, because they may affect the interpretation of allergy 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

Mold Allergen Mix 2 IgE

Frequently asked questions

Does a positive result mean I am allergic to mold?
It indicates that your immune system has developed IgE antibodies to one or more tested mold allergens. Your clinician can explain whether this finding is consistent with your symptoms and circumstances.
What symptoms can mold allergy cause?
Depending on the person and exposure, mold allergy may cause sneezing, runny or congested nose, watery eyes, wheezing, coughing, or skin symptoms.
Can I take allergy medicines before this test?
Discuss antihistamine use with your clinician before testing. Some medicines can reduce skin-test responses, and their potential effect on this blood test should be reviewed individually.
  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