Helminthosporium-Specific IgG Antibody, Qualitative (Deprecated)
A blood test for IgG antibodies to Helminthosporium, a mold. This deprecated test is mainly of historical or specialized clinical interest.
["A positive result shows prior immune exposure to Helminthosporium but does not by itself diagnose an active allergy."]
Key facts at a glance
- LOINC
- 33289-0
- Short code
- Deprecated Helminthosporium IgG RAST Ql
- Synonyms
- Deprecated Helminthosporium 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 laboratory test looks for IgG antibodies directed against Helminthosporium, a type of mold. IgG antibodies are part of the immune response and may develop after exposure. The test has been deprecated and may not be routinely available.
Why might I need this test?
It may have been used in the evaluation of people with respiratory or other symptoms after exposure to mold or dust. Results are generally interpreted along with the medical history, symptoms, exposure pattern, and other allergy tests.
How is the test performed?
A blood sample is analyzed in the laboratory for antibodies that react with Helminthosporium antigen. The report is recorded as positive, negative, or otherwise qualitative, depending on the laboratory method.
How do I prepare for the test?
No special preparation is usually required for a routine blood draw. Because this test is deprecated, confirm with the ordering clinician or laboratory that it is available and appropriate before having it performed.
Reference range
Adult: 10-40 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.
A positive result indicates that the immune system has produced IgG antibodies to Helminthosporium, suggesting previous exposure. It does not prove that the mold is causing current symptoms or that the person has a mold allergy, because IgG antibodies can also occur after exposure without disease.
Short name
Helminthosporium IgG antibody test
Frequently asked questions
Does a positive result mean I have a Helminthosporium allergy?
Is this the same as a mold-specific IgE allergy test?
Why is the test described as deprecated?
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