House Dust Hollister Stier H2 IgG Biomarker Testing
It measures IgG antibodies to a standardized house dust extract to support exposure context, with convenient ordering and Quest lab access via Vitals Vault.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
This test measures IgG antibodies your immune system has made against a standardized “house dust” extract (HollisterStier H2). It is sometimes ordered when you are trying to understand whether ongoing exposure to indoor dust is part of a bigger picture of symptoms or inflammation.
IgG results are often confusing because they do not work like classic “allergy tests.” A positive IgG can reflect exposure and immune recognition, and it does not automatically mean you have an IgE-mediated allergy or that dust is the cause of your symptoms.
If you already have a result in hand, the most useful next step is usually to interpret it alongside your symptoms, your environment, and (when appropriate) IgE testing or other clinical evaluation. This supports clinician-directed care rather than self-diagnosis.
Do I need a House Dust Hollister Stier H2 IgG test?
You might consider this test if you are trying to make sense of symptoms that seem tied to indoor environments, such as persistent nasal congestion, post-nasal drip, cough, throat irritation, headaches, or “brain fog” that worsens at home or at work. Some people also look at dust-related IgG when they are exploring possible triggers for fatigue or nonspecific inflammatory symptoms, especially when the pattern is chronic rather than sudden.
This test can also be useful if you are comparing exposures over time. For example, you may want a baseline before a major home remediation, a move, or a change in workplace environment, and then a follow-up result later to see whether your immune system’s recognition of dust is trending up or down.
You generally do not need this test for urgent allergy symptoms such as hives, wheezing, or anaphylaxis. In those situations, IgE-focused evaluation and clinician guidance are more appropriate.
Because IgG to environmental antigens is not a standalone diagnosis, it is best used as one data point to discuss with your clinician, especially if you are deciding what to test next or what changes are worth making in your environment.
This is a laboratory-developed blood test typically performed in a CLIA-certified lab; results should be interpreted in clinical context and are not, by themselves, diagnostic of allergy or disease.
Lab testing
Order House Dust Hollister Stier H2 IgG and schedule your lab draw
Schedule online, results typically within about a week
Clear reporting and optional clinician context
HSA/FSA eligible where applicable
Get this test with Vitals Vault
Vitals Vault lets you order House Dust Hollister Stier H2 IgG testing without needing to coordinate the logistics yourself. After you order, you can complete your blood draw at a participating lab location and view your results in one place.
If you are not sure how to interpret an IgG result, PocketMD can help you turn the number into a plan. You can ask questions like whether your result fits your symptoms, what companion tests might clarify the picture (such as allergen-specific IgE), and when a retest would be reasonable.
This test is most helpful when it is part of a structured follow-up approach: confirm the type of immune response you are dealing with, reduce or document exposure when appropriate, and then recheck if you are tracking change over time.
- Order online and complete your draw at a local lab location
- Clear, plain-language result context with PocketMD
- Easy retesting to track trends after environment changes
Key benefits of House Dust Hollister Stier H2 IgG testing
- Adds objective data when you suspect indoor dust exposure is contributing to chronic symptoms.
- Helps distinguish “immune recognition/exposure” questions from classic immediate-type allergy questions (which are usually IgE).
- Can be used as a baseline before remediation, moving, or workplace changes so you can track trends later.
- Supports more targeted follow-up testing, such as dust mite–specific IgE or broader environmental panels when needed.
- May reduce guesswork by helping you prioritize which exposures to discuss with your clinician.
- Provides a standardized extract (H2) result that is easier to compare across time than vague “dust” descriptions.
- Pairs well with PocketMD guidance so you can interpret the result in context instead of reacting to a single flag.
What is House Dust Hollister Stier H2 IgG?
House Dust HollisterStier H2 IgG is a blood test that measures immunoglobulin G (IgG) antibodies directed against a standardized house dust extract. “H2” refers to a specific commercial extract preparation used for laboratory testing.
IgG antibodies are part of your adaptive immune system’s memory. When your body encounters proteins from the environment, it can produce IgG as a sign of exposure and immune recognition. That is different from immunoglobulin E (IgE), which is more closely tied to immediate-type allergic reactions like sneezing fits, itchy eyes, hives, or asthma flares after exposure.
Because house dust is a mixture, the H2 extract may include proteins from multiple sources found in indoor dust. Your result therefore does not pinpoint a single component (for example, a specific dust mite species) unless you also test those components directly.
In practice, clinicians may use this test as a piece of a broader evaluation that can include symptom history, home/work exposure review, physical exam, and other labs. The goal is to decide whether dust exposure is likely relevant and what the most efficient next step is.
IgG vs IgE: why the distinction matters
If your main question is “Do I have an allergy that could cause immediate symptoms?” then allergen-specific IgE (and sometimes skin testing) is usually the better match. If your question is “Have I had meaningful exposure, and is my immune system reacting in a way that could be relevant to chronic symptoms?” then IgG can be one of the data points, but it still needs careful interpretation.
What this test does not tell you
A positive IgG does not prove that dust is the cause of your symptoms, and it does not diagnose allergic rhinitis, asthma, or any specific condition. It also does not identify the exact dust component responsible, which is why follow-up testing often focuses on more specific allergens (such as dust mites) if the clinical story fits.
What do my House Dust Hollister Stier H2 IgG results mean?
Low House Dust H2 IgG
A low or negative result generally means the lab did not detect a meaningful IgG response to the H2 house dust extract. This can happen if your exposure is limited, if your immune system has not formed measurable IgG to the extract, or if your symptoms are driven by something else. If you have strong, immediate allergy-type symptoms, a low IgG does not rule out IgE-mediated allergy, so IgE testing may still be appropriate.
In-range / expected House Dust H2 IgG
An in-range result is often interpreted as no significant elevation beyond what the lab considers typical for the population it uses to set reference limits. It may suggest that dust exposure is not a dominant immune trigger for you, but it does not exclude sensitivity to specific indoor allergens not well represented by the extract. If you are tracking change over time, consistency across repeated tests can be more informative than a single “normal” result.
High House Dust H2 IgG
A high result indicates that your immune system has produced more IgG antibodies to the H2 house dust extract than the lab’s reference range. This most commonly reflects exposure and immune recognition, and it may or may not correlate with symptoms. If you also have symptoms that reliably worsen in dusty environments, your clinician may consider targeted next steps such as dust mite–specific IgE testing, an environmental review, or a trial of exposure reduction followed by retesting.
Factors that influence House Dust H2 IgG
Your result can be influenced by how much dust exposure you have at home or work, recent changes such as moving or renovations, and seasonality of indoor humidity that affects dust mite growth. Immune-modulating medications and certain health conditions can also affect antibody production. Because “house dust” is a mixture, different labs and extract preparations can vary, so try to retest using the same method if you are trending results over time.
What’s included
- House Dust (Hollister- Stier) (H2) Igg
Frequently Asked Questions
What does a House Dust Hollister Stier H2 IgG test measure?
It measures IgG antibodies in your blood that bind to a standardized house dust extract (HollisterStier H2). The result reflects immune recognition of that extract, which is often related to exposure, and it is not the same as an IgE allergy test.
Is IgG testing the same as an allergy test?
Not in the usual sense. Immediate-type allergies are typically evaluated with allergen-specific IgE blood tests or skin testing. IgG can sometimes be used to add exposure context, but a positive IgG does not diagnose an allergy or prove that dust is causing your symptoms.
Do I need to fast before this blood test?
Fasting is not typically required for allergen IgG testing. If you are getting other labs at the same visit (such as metabolic or lipid testing), follow the instructions for the full set of tests you ordered.
What is considered a “high” House Dust H2 IgG result?
“High” means your value is above the reference range used by the laboratory running the assay. Because units and cutoffs can vary by lab and method, the most reliable way to interpret your result is to use the reference interval printed on your report and compare trends over time using the same lab method.
How often should I retest House Dust H2 IgG?
Retesting is most useful when something meaningful has changed, such as moving, remediation, or a sustained exposure reduction plan. Many people wait several weeks to a few months to allow antibody levels to reflect a new steady state, but the right timing depends on your symptoms and your clinician’s plan.
If my House Dust H2 IgG is high, what should I test next?
A common next step is more specific testing that matches your symptoms, such as dust mite–specific IgE if you have classic allergy symptoms. If your symptoms are broader, your clinician may also consider evaluating other indoor allergens, reviewing your environment, or checking general health markers that can affect how you feel.