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Mucor racemosus-Specific IgG Antibodies, Radioallergosorbent Test, Qualitative (Deprecated)

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

A qualitative blood test for IgG antibodies to the mold Mucor racemosus, using a radioallergosorbent method. This legacy test is deprecated.

Quick summary

["A positive result shows Mucor racemosus-specific IgG antibodies but does not by itself diagnose allergy, infection, or disease."]

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

Key facts at a glance

LOINC
33297-3
Short code
Deprecated M racemosus IgG RAST Ql
Synonyms
Deprecated M racemosus IgG 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 qualitative test looks for IgG antibodies directed against Mucor racemosus, a type of mold. It uses a radioallergosorbent method and is considered a deprecated or legacy test.

Why might I need this test?

It may have been ordered to evaluate immune exposure to this mold, particularly in people with respiratory symptoms or suspected mold-related illness. Because it is deprecated, current testing may use other methods.

How is the test performed?

A blood sample, usually serum, is tested for antibodies that bind Mucor racemosus antigens using a radioallergosorbent method. The result is reported qualitatively, generally as positive or negative.

How do I prepare for the test?

No special preparation is usually needed for this antibody test unless the laboratory provides different instructions. Tell the ordering clinician about any mold exposure, symptoms, immune disorders, or immunosuppressive treatment.

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

Mucor racemosus IgG RAST

Frequently asked questions

Does a positive result mean I have a Mucor infection?
No. IgG antibodies can remain after past exposure and do not necessarily indicate an active infection. Your clinician must interpret the result with your symptoms, examination, and other tests.
Is this the same as allergy testing?
Not necessarily. This test measures IgG antibodies, while many allergy tests measure IgE, which is more closely associated with immediate allergic reactions. A positive IgG result should not be assumed to explain allergy symptoms.
Why is this test listed as deprecated?
The test is a legacy method and is no longer routinely recommended or may no longer be available. Your clinician can determine whether a current mold-exposure or allergy evaluation would be more appropriate.
  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