LabInformationLab tests, explained

Hexamethylene Diisocyanate (HDI) Allergy Test in California

Below is a plain-language overview of the hexamethylene diisocyanate (hdi) allergy test. The hexamethylene diisocyanate (HDI) allergy test is a blood test that checks for antibodies your immune system may make after exposure to HDI, a chemical used in some paints, coatings, and foams. It is usually ordered when a person has workplace exposure and symptoms such as wheezing, coughing, or skin reactions that could be related to HDI. This page covers the hexamethylene diisocyanate (hdi) allergy test for people in California, in Pacific, from what it measures to how to arrange a draw.

Sample type
blood
Category
Allergy
Turnaround
1-3 business days
Price
$49
Referral
Not required

The hexamethylene diisocyanate (HDI) allergy test is a blood test that checks for antibodies your immune system may make after exposure to HDI, a chemical used in some paints, coatings, and foams. It is usually ordered when a person has workplace exposure and symptoms such as wheezing, coughing, or skin reactions that could be related to HDI.

What it measures

  • HDI-specific IgE — An antibody linked to immediate-type allergic reactions to HDI.
  • HDI-specific IgG — An antibody that can show immune exposure to HDI, though it does not by itself confirm allergy.
  • Total IgE — A general measure of allergic antibody levels, sometimes included for context.
  • Serum control — A check that the sample was handled properly and the test ran correctly.

Who it is for

This test is typically ordered by allergists, occupational medicine clinicians, or primary care clinicians for people who work with HDI-containing products and have symptoms that may be work-related.

Preparation

No fasting is required. Tell your clinician about any medicines you take, because some drugs may affect antibody levels; timing may matter if symptoms are recent.

Results and what they mean

Results are usually reported as negative or positive, sometimes with a numeric level for each antibody. A positive result does not prove allergy by itself, and a negative result does not rule it out, so a clinician interprets the results alongside your history and exam. This is general information, not medical advice.

Requesting the Hexamethylene Diisocyanate (HDI) Allergy Test in California

Order online, choose a certified collection site in California, and review results through a secure portal. No referral is required, and orders are processed confidentially. Because the region is uneven, coastal metros, inland towns, and rural counties with very different access to testing — worth planning around when you book.

Frequently asked questions

Is this test painful?

It uses a standard blood draw, so you may feel a brief pinch or sting.

How long do results take?

Typical turnaround is 1 to 3 business days, though it can vary by lab.

Do I need to fast?

No. Fasting is not required for this test.

Can this test tell me if I can keep working with HDI?

No. Work decisions should be made with your clinician and workplace safety staff based on your full evaluation.

Hexamethylene Diisocyanate (HDI) Allergy Test by city in California

All testing in California →   Full Hexamethylene Diisocyanate (HDI) Allergy Test guide →