Aspergillus Versicolor IgG Biomarker Testing
It measures IgG antibodies to Aspergillus versicolor to support exposure assessment, with ordering and results through Vitals Vault and Quest labs.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
An Aspergillus versicolor IgG test measures whether your immune system has made IgG antibodies to Aspergillus versicolor, a common indoor mold that can grow in damp buildings and on water-damaged materials.
This is not an “all mold” test and it is not the same as allergy testing. Instead, it is usually used to add context when you and your clinician are sorting out possible mold exposure, certain work or home environments, or immune-related lung symptoms.
Because antibodies can reflect past exposure as well as ongoing exposure, your result is most useful when it is interpreted alongside your symptoms, timing, and any related labs or imaging your clinician recommends.
Do I need a Aspergillus Versicolor IgG test?
You might consider Aspergillus versicolor IgG testing if you have ongoing respiratory symptoms that seem tied to a building or workplace, such as persistent cough, shortness of breath with exertion, chest tightness, or flu-like episodes that improve when you are away from a specific environment.
This test can also be helpful when there is a known history of water damage, visible mold, or musty odors in your home, school, or job site and you are trying to document whether your immune system shows evidence of exposure to this specific mold.
It is less likely to be the right first test if your main issue is immediate allergy symptoms (sneezing, itchy eyes, hives, wheezing right after exposure). In those cases, allergen-specific IgE testing or skin testing is usually a better match.
Testing should support clinician-directed care rather than self-diagnosis. A single IgG result rarely answers the whole question by itself, but it can be a useful piece of a broader evaluation.
This is a laboratory-developed test performed in a CLIA-certified lab; results support clinical assessment but do not diagnose mold illness on their own.
Lab testing
Order labs to measure Aspergillus versicolor IgG
from $100.84 at Quest Diagnostics
About 1 week
Schedule online — results typically within a week
Clear next steps
Guidance included, with follow-up care available
HSA / FSA
Eligible for pre-tax health spending accounts
Get this test with Vitals Vault
If you want a clear, documented Aspergillus versicolor IgG result without a long wait for an appointment, you can order the test through Vitals Vault and complete your blood draw at a nearby Quest location.
Once your result is back, you can use PocketMD to translate what “low,” “in range,” or “high” means for your situation, including how timing of exposure and your symptom pattern can change the interpretation.
Vitals Vault is most useful when you want to (1) confirm whether this specific mold antibody is present, (2) decide what companion tests might add clarity, and (3) plan a sensible retest window if your exposure risk changes.
- Order online and draw at a Quest location
- PocketMD guidance for next steps and retest timing
- Easy re-ordering if you and your clinician are trending results
Key benefits of Aspergillus Versicolor IgG testing
- Helps document immune recognition (IgG) to Aspergillus versicolor as one data point in exposure assessment.
- Supports evaluation of building- or workplace-linked respiratory symptoms when exposure history is unclear.
- Can help differentiate “exposure pattern” questions from immediate allergy questions that are better answered by IgE.
- Provides a baseline you can compare against if your environment changes or remediation occurs.
- May contribute to a clinician’s workup for immune-mediated lung conditions when interpreted with imaging and pulmonary testing.
- Helps you choose smarter follow-up labs (for example, adding other mold IgG targets or inflammatory markers) instead of repeating the same test blindly.
- Gives you a standardized lab result you can review in PocketMD and share with your clinician for a coordinated plan.
What is Aspergillus Versicolor IgG?
Aspergillus versicolor is a species of mold that can be found indoors, especially in damp or water-damaged environments. “IgG” (immunoglobulin G) is a class of antibodies your immune system can produce after exposure to a substance, including microbes and environmental antigens.
An Aspergillus versicolor IgG blood test measures the amount of IgG antibodies in your blood that bind to Aspergillus versicolor antigens. In plain terms, it looks for evidence that your immune system has encountered this mold and mounted an antibody response.
A key limitation is that IgG is not a direct measurement of mold in your body or your home. Many people can have detectable IgG from prior exposures without being sick, while some people with symptoms may have low or negative IgG depending on timing, immune status, and the specific mold involved.
IgG vs IgE: why the distinction matters
IgE antibodies are more closely tied to immediate-type allergies, where symptoms can occur minutes to hours after exposure. IgG antibodies often reflect exposure and immune recognition over time, and they are sometimes used in the evaluation of conditions like hypersensitivity pneumonitis (an immune-mediated lung reaction) when the clinical picture fits.
What this test does not measure
This test does not identify all molds, quantify mold levels in your environment, or prove that mold is the cause of your symptoms. It also does not replace medical evaluation for asthma, infection, chronic sinus disease, or other causes of cough and shortness of breath.
What do my Aspergillus Versicolor IgG results mean?
Low (or negative) Aspergillus versicolor IgG
A low or negative result generally means the lab did not detect a meaningful IgG antibody response to Aspergillus versicolor. This can happen if you have not been exposed, if exposure was very limited, or if the exposure was too recent for IgG to rise. It can also occur if your symptoms are driven by a different mold species or by a non-mold cause. If suspicion remains high, your clinician may suggest testing additional molds or focusing on lung and allergy evaluation.
In-range Aspergillus versicolor IgG
An in-range result is often interpreted similarly to low/negative, depending on the lab’s reference interval and reporting format. It suggests there is not strong serologic evidence of a heightened IgG response to this specific mold. If you feel well, this is usually reassuring. If you have persistent symptoms, “in range” does not rule out exposure to other molds or an immune reaction that is not captured by this single marker.
High Aspergillus versicolor IgG
A high result means your immune system has produced more IgG antibodies to Aspergillus versicolor than the lab’s reference range. This is most commonly interpreted as evidence of prior or ongoing exposure, not proof of disease. The result becomes more meaningful when it matches your story—for example, symptoms that worsen in a particular building, plus supportive findings from pulmonary function testing or imaging. If you are immunocompromised or have severe symptoms, your clinician may also consider other evaluations to rule out infection or alternative diagnoses.
Factors that influence Aspergillus versicolor IgG
Timing matters: IgG may rise weeks after exposure and can remain detectable long after exposure ends. Your immune status can affect antibody production, so immunosuppressive medications or immune deficiencies may blunt results. Cross-reactivity between related molds can sometimes contribute to higher readings, depending on the assay. Finally, reference ranges vary by lab method, so it is best to interpret changes over time using the same lab when possible.
What’s included
- Aspergillus Versicolor Igg*
Similar tests you might consider
Frequently Asked Questions
Is Aspergillus versicolor IgG the same as a mold allergy test?
No. IgG testing looks for IgG antibodies, which often reflect exposure and immune recognition over time. Allergy testing typically focuses on IgE antibodies (or skin testing), which are more associated with immediate allergic reactions like sneezing, itchy eyes, or hives.
Do I need to fast before an Aspergillus versicolor IgG blood test?
Fasting is not usually required for an IgG antibody test. If you are combining this with other labs that do require fasting (such as lipids or glucose/insulin testing), follow the instructions for the full set of tests you ordered.
Can a high Aspergillus versicolor IgG prove mold is causing my symptoms?
A high result supports that you have been exposed and developed antibodies to this mold, but it does not prove causation. Many people have antibodies without symptoms, and symptoms can come from asthma, infections, irritants, other molds, or non-respiratory conditions. Your clinician may interpret this alongside your exposure history, imaging, and pulmonary testing.
What if my result is negative but I’m sure I was exposed to mold?
A negative result can happen if the exposure was recent, if the relevant mold is not Aspergillus versicolor, or if your immune system does not mount a strong IgG response. In that situation, it may be more useful to broaden testing to other mold IgG targets, consider IgE testing for allergy-type symptoms, and evaluate other causes of your symptoms.
How soon after exposure should I test IgG antibodies?
IgG antibodies often take days to weeks to rise after exposure, and they can remain elevated for a while. If you are testing to understand a recent change in environment, your clinician may suggest waiting a few weeks or using repeat testing to look for a trend rather than relying on a single early result.
Should I retest Aspergillus versicolor IgG after remediation or moving?
Retesting can be reasonable if you are tracking whether antibody levels trend down after a meaningful change in exposure risk, but the timeline is variable. Many clinicians consider retesting in a few months rather than a few weeks, especially if symptoms are improving and you are using the same lab method for comparison.