Alternaria-Specific Immunoglobulin G (IgG) Antibody, Serum
Measures IgG antibodies to Alternaria mold in serum. These antibodies can indicate prior exposure but do not by themselves confirm a mold allergy.
["A positive result shows detectable Alternaria-specific IgG, which may reflect past exposure rather than an active allergy."]
Key facts at a glance
- LOINC
- 110028-8
- Short code
- Alternaria IgG Msmt Ser
- Synonyms
- Alternaria IgG Msmt Ser
- Category
- liver
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 7
- Ref high
- 56
- Critical range
- — – 500 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 84484
- SNOMED
- 302773008
- 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 antibodies directed against Alternaria, a group of molds commonly found indoors and outdoors. It detects Alternaria-specific IgG, an immune response that may develop after exposure.
Why might I need this test?
The test may be considered when symptoms such as sneezing, congestion, wheezing, or skin irritation occur in an environment with possible mold exposure. It may also be used to help evaluate suspected mold-related immune sensitization.
How is the test performed?
A blood sample is collected and the serum is analyzed in the laboratory for Alternaria-specific IgG antibodies. Results are reported as positive or negative or with a laboratory-defined measurement level.
How do I prepare for the test?
Fasting is usually not required, but follow any instructions provided by the laboratory or ordering clinician. Tell the clinician about allergies, current symptoms, and medicines or immune therapies you are using.
Reference range
Adult males: 7-56 U/L; Adult females: 7-43 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Detectable Alternaria-specific IgG may indicate previous exposure or sensitization to Alternaria mold. It does not establish that mold is causing current symptoms and may occur in people without an allergy. If results are unexpected or symptoms are persistent, a clinician can interpret them alongside your history, examination, and other allergy testing.
Short name
Alternaria IgG
Frequently asked questions
Does a positive Alternaria IgG result mean I am allergic to mold?
What symptoms can occur with Alternaria exposure?
Is this the same as an Alternaria IgE allergy test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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