Ethylene Oxide K78 IgE (Occupational Allergy) Biomarker Testing
It checks whether you have IgE sensitization to ethylene oxide, and you can order it through Vitals Vault with Quest lab draw access and PocketMD support.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
Ethylene oxide (EtO) is a gas used to sterilize medical equipment and in some manufacturing settings. If you work around EtO and you get episodes of wheezing, chest tightness, cough, nasal congestion, hives, or unexplained “allergy-like” symptoms that seem tied to work, a targeted blood test can help clarify whether an IgE-type allergy pathway may be involved.
The Ethylene Oxide K78 IgE test looks for allergen-specific IgE antibodies to ethylene oxide. A positive result does not automatically prove that EtO is the cause of your symptoms, but it can support an occupational health evaluation and help guide next steps like exposure controls, PPE decisions, and whether you should pursue additional testing.
Because workplace decisions can affect your job and your health, it helps to interpret this result in context: your symptoms, timing (better on days off vs worse at work), and any other respiratory or skin conditions you may have.
Do I need a Ethylene Oxide K78 IgE test?
You may want this test if you have symptoms that reliably flare during or after work in environments where ethylene oxide is used, such as sterilization areas, medical device processing, or certain chemical manufacturing settings. Common patterns include new or worsening asthma-like symptoms (wheezing, shortness of breath, chest tightness), persistent work-related nasal symptoms, or hives/itching that appear with shifts and improve on weekends or vacations.
This test can also be useful if your workplace is documenting potential sensitization, if you are undergoing an occupational health screening, or if you and your clinician are trying to distinguish irritant reactions from an IgE-mediated allergy pattern. That distinction matters because an IgE pathway can be associated with more predictable trigger-response patterns and may change how strictly exposures need to be controlled.
You do not usually need this test for general seasonal allergies or for non-specific symptoms without a clear workplace exposure history. If your main issue is chronic cough, recurrent bronchitis, or shortness of breath that is not clearly linked to work, broader evaluation (spirometry, assessment for asthma, reflux, infections, or other exposures) may be more informative.
Testing is meant to support clinician-directed care and workplace safety planning, not to self-diagnose or to make employment decisions on your own.
This is a laboratory-developed, CLIA-validated allergen-specific IgE blood test; results should be interpreted with your symptoms and exposure history and are not a standalone diagnosis.
Lab testing
Order labs to measure Ethylene Oxide IgE
from $21.99 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
Vitals Vault lets you order ethylene oxide (K78) specific IgE testing without needing to schedule a separate referral visit first. You complete your order, get your blood drawn through the Quest network, and then review the result in a clear, plain-language format.
If your result is positive or confusing, PocketMD can help you turn it into an action plan for your next conversation with occupational health or an allergist. That can include how to describe symptom timing, what companion tests might clarify the picture, and when it makes sense to recheck after exposure changes.
If you are trying to map a broader allergy profile (because symptoms persist even away from work), you can also add other environmental IgE testing so you are not attributing everything to one workplace chemical.
- Order online and use the Quest draw network
- Results you can save for occupational health documentation
- PocketMD support to interpret results and plan next steps
Key benefits of Ethylene Oxide K78 IgE testing
- Helps identify whether your immune system has developed IgE sensitization to ethylene oxide.
- Adds objective data when your symptoms seem tied to specific work areas or tasks.
- Supports occupational health documentation when exposure controls or job modifications are being considered.
- Helps distinguish possible IgE-mediated allergy patterns from non-allergic irritation (which can feel similar).
- Guides whether you should pursue additional evaluation such as spirometry, peak-flow tracking, or specialist referral.
- Can be trended over time if workplace exposure controls change and you need follow-up context.
- Pairs well with broader environmental IgE testing when you need to separate workplace triggers from background allergies.
What is Ethylene Oxide K78 IgE?
Ethylene Oxide K78 IgE is a blood test that measures allergen-specific immunoglobulin E (IgE) antibodies directed at ethylene oxide (EtO). IgE is the antibody class involved in immediate-type allergic reactions. When you become sensitized, your immune system can produce IgE that recognizes a trigger, and exposure can then contribute to symptoms such as hives, nasal congestion, or asthma-like reactions.
Ethylene oxide is a reactive gas used to sterilize heat-sensitive medical equipment and in some industrial processes. Because it is a chemical rather than a typical “protein allergen,” the lab test uses a standardized allergen preparation (often referenced as K78) to detect whether your blood contains IgE that binds in a way consistent with sensitization.
A key point is that sensitization is not the same as clinical allergy. You can have detectable IgE and minimal symptoms, or you can have symptoms from EtO irritation or other exposures even if IgE is negative. That is why your work history and symptom timing matter as much as the number on the report.
IgE sensitization vs. symptoms
A positive specific IgE result means your immune system has made IgE that reacts to the test allergen. Whether that translates into real-world symptoms depends on your exposure level, your airway sensitivity (for example, underlying asthma), and whether other irritants are present at the same time.
Why occupational context matters
Ethylene oxide exposure is usually job-related, so interpretation often includes where you work, what controls are in place, and whether symptoms improve away from the workplace. This test is most useful when it is part of a structured occupational health evaluation rather than a one-off “allergy check.”
What do my Ethylene Oxide K78 IgE results mean?
Low (negative) Ethylene Oxide K78 IgE
A low or negative result means the test did not detect ethylene oxide–specific IgE above the lab’s cutoff. This makes an IgE-mediated EtO allergy less likely, but it does not rule out symptoms from irritation, high-level exposure, or other workplace triggers. If your symptoms are clearly work-related, your next step is often to look at exposure controls and consider objective breathing tests (such as spirometry) or peak-flow monitoring across work and non-work days.
In-range results (interpreted by class or cutoff)
Many labs report specific IgE as a numeric value and/or “class,” with a cutoff separating negative from positive. If your result is near the cutoff, it may be harder to interpret without strong symptom timing and exposure details. In this situation, clinicians often focus on whether your symptoms reproducibly track with EtO exposure and may repeat testing or add related allergy and asthma evaluations to reduce uncertainty.
High (positive) Ethylene Oxide K78 IgE
A high or positive result suggests sensitization to ethylene oxide, meaning your immune system has IgE that reacts to the EtO allergen preparation. This supports (but does not prove) that EtO could be contributing to your symptoms, especially if you notice worsening during shifts and improvement away from work. A positive result is often used to justify tighter exposure controls, review of PPE fit and use, and referral to occupational medicine or allergy/immunology for a structured assessment.
Factors that influence Ethylene Oxide K78 IgE
Your result can be influenced by the timing and intensity of exposure, because sensitization typically develops after repeated contact rather than a single event. Underlying allergic disease (like allergic rhinitis or asthma) can make symptoms more noticeable even at lower exposures, and other workplace irritants can mimic allergy. Medications such as antihistamines generally do not affect blood IgE results the way they can affect skin testing, but immune-modulating therapies and major health changes can sometimes alter antibody patterns over time. Lab methods and cutoffs vary, so it is best to interpret the number using the reference information on your report.
What’s included
- Ethylene Oxide (K78) Ige
Similar tests to consider
Frequently Asked Questions
What does the Ethylene Oxide K78 IgE test detect?
It detects allergen-specific IgE antibodies in your blood that react to ethylene oxide (EtO). A positive result suggests sensitization, which can support an IgE-mediated occupational allergy evaluation when symptoms and exposure history fit.
Do I need to fast for an ethylene oxide IgE blood test?
Fasting is not typically required for specific IgE testing. If you are combining this test with other labs that do require fasting, follow the instructions for the full order.
If my Ethylene Oxide K78 IgE is positive, does that prove my workplace is causing my symptoms?
No. A positive test supports sensitization, but it does not prove causation by itself. Clinicians usually interpret it alongside symptom timing (work vs days off), exposure assessment, and sometimes breathing tests or peak-flow tracking.
Can I have work-related breathing symptoms with a negative Ethylene Oxide K78 IgE?
Yes. Ethylene oxide and other workplace chemicals can cause irritation or trigger asthma symptoms without an IgE mechanism. A negative IgE result makes classic immediate-type allergy less likely, but it does not rule out occupational asthma, irritant-induced symptoms, or other exposures.
How is this different from skin prick testing?
This is a blood test that measures specific IgE, while skin testing looks for an immediate skin reaction to an allergen extract. Blood testing can be more practical for occupational documentation and does not require stopping antihistamines, but the best choice depends on your situation and specialist guidance.
Should I repeat the Ethylene Oxide K78 IgE test?
Repeat testing can be reasonable if your exposure conditions change (new controls, new role, different area) or if your symptoms evolve and you need updated documentation. Your clinician or occupational health team can help decide timing, since antibody levels do not always change quickly.
What other tests are commonly paired with this in occupational evaluations?
Depending on your symptoms, clinicians often pair IgE testing with spirometry, bronchodilator response testing, peak expiratory flow monitoring across work and non-work days, and broader environmental allergy testing if symptoms persist outside the workplace.