Phthalic Anhydride Allergy Test
This page explains the phthalic anhydride allergy test, what it measures, and how to arrange it. The phthalic anhydride allergy test is a blood test that looks for specific antibodies the immune system may make against phthalic anhydride, a chemical used in making plastics, resins, and coatings. It is ordered when a worker or other exposed person has symptoms such as wheezing, nasal congestion, or skin reactions that might be linked to this chemical.
- Sample type
- blood
- Category
- Allergy
- Turnaround
- 1-3 business days
- Price
- $49
- Referral
- Not required
The phthalic anhydride allergy test is a blood test that looks for specific antibodies the immune system may make against phthalic anhydride, a chemical used in making plastics, resins, and coatings. It is ordered when a worker or other exposed person has symptoms such as wheezing, nasal congestion, or skin reactions that might be linked to this chemical.
What it measures
- Specific IgE to phthalic anhydride — The main marker; shows whether the immune system has made allergy-type antibodies to this chemical.
- Total IgE — A general measure of allergic antibody level, sometimes used for context.
- Other related acid anhydrides — May be checked together because exposures and reactions can overlap.
- Inhalant allergen panel — Common airborne allergens may be tested to rule out other causes of symptoms.
Who it is for
The test is usually ordered by allergists, occupational medicine physicians, or primary care clinicians evaluating people with possible work-related allergy symptoms.
Preparation
No fasting or special preparation is needed. Timing is not critical, though tell your clinician about any medicines you take, since some can affect allergy testing.
Results and what they mean
Results are reported as a level or class for each specific IgE marker, often alongside a total IgE value. A clinician interprets these in the context of your symptoms, exposure history, and other tests. This is general information only and is not medical advice; discuss your results with a qualified healthcare professional.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the phthalic anhydride allergy test is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
Is this test painful?
It uses a standard blood draw, so you may feel a brief pinch when the needle goes in.
Do I need to stop my allergy medicines?
Some medicines can affect allergy tests, so ask your clinician before stopping anything.
How long until I get results?
Results are typically available within 1 to 3 business days.
Can this test tell me if I have an allergy?
It shows whether antibodies are present, but only a clinician can interpret what that means for you.