A patient seated in the chair before a blood draw
In person

Scallop Allergy (IgE)

IgE antibodies to scallop, measured from one blood draw.

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  • 2,000+ lab locations. Find one near you
  • Nothing due at the lab. FSA / HSA accepted
  • Ordered by a licensed clinician

At a glance

Collection
Blood draw
A standard blood draw at the lab.
Preparation
None
Nothing to do ahead of time. Water is fine.
Results
3 to 5 days
Typical turnaround after your visit.
Where
2,000+ lab locations
Nationwide, with nothing due at the lab.

About this test

This test checks your blood for IgE antibodies to scallop. Scallop is a mollusk, a shellfish group that also includes clams, oysters, and squid. A positive result shows sensitization, which is not the same as an allergy. There is nothing to do ahead of your visit.

For adults 18 and older. Test availability varies by lab location.

Who should take this test?

This test is for adults who want to know whether they are sensitized to scallop, for example after a reaction to shellfish, or ahead of an allergist visit.

Ask about this test

Not sure this is the right test?

AI-generated. For information only, not medical advice. Call 911 for an emergency.

What does this test measure?

Your result shows whether your blood has IgE to scallop, which can help a healthcare provider understand whether scallop may be linked to your symptoms.

Scallop-specific IgE (f338)
Specific IgE is an antibody the immune system can make against a single food. This marker measures IgE that recognizes scallop, a mollusk. A level above the lab’s reference range shows sensitization, which an allergist reads with your history.
Why it’s measured: Checks for IgE sensitization to scallop, often after a reaction to shellfish.

How it works

  1. Step 1

    Order online

    Check out here. A licensed clinician in your state reviews your order and sends it to the lab.

  2. Step 2

    Visit a lab

    Bring a photo ID to any of 2,000+ lab locations. No fasting needed, and nothing is due at the lab.

  3. Step 3

    Get your results

    Results post to your account, usually in 3 to 5 days, each number next to the lab’s reference range.

Find a lab near you

Choose from 2,000+ lab locations nationwide. Your order works at any of them.

What your results tell you

Results come back as an IgE level in kU/L, compared with the lab’s reference range. Above the range shows sensitization, not necessarily allergy.

  • Your number next to the lab’s reference range
  • Explained in plain language
  • A licensed clinician reviews your order and, if appropriate, orders the test.
  • A lab report you can download and share

Decisions about eating scallop belong with an allergist or other healthcare provider, who reads this result with your history.

Clinical-grade testing, from the comfort of home.

From the lab to your report, every step of our process meets the gold standard in medical testing.

  • CLIA-certified labs

    Every lab we partner with is certified under the Clinical Laboratory Improvement Amendments, meeting both state and federal standards with regular independent inspections.

  • We protect your health data

    We protect your health data with encryption and do not sell it. Some results must be reported to public health authorities by law. See our Privacy Notice.

  • Rigorous quality assurance

    All partner labs run regular internal quality checks, participate in proficiency testing, and comply with federal and state lab regulations.

  • Clinician-reviewed reports

    Results are reviewed by an independent, licensed clinician.

Questions

Common questions.

Anything else, our care team answers by phone, text, or email.

Scallop is a mollusk, like clams, oysters, squid, and octopus. Shrimp, crab, and lobster are crustaceans, a different shellfish group. The two groups can share similar proteins, so some people are sensitized to one group and some to both.

Shellfish allergy can first appear in adulthood. Decisions about eating any shellfish belong with an allergist, who reads your results with your history.

Not on its own. A positive result means your immune system has made IgE to scallop, which is called sensitization. Many people who are sensitized have no symptoms when they are exposed.

A diagnosis of allergy is made by a healthcare provider who looks at your symptoms and history along with results like this one. A negative result also does not by itself mean you are not allergic.

No. This test is not for urgent reactions. If you have trouble breathing, swelling of the face or throat, or you faint after eating any food, call 911 or get emergency care right away. If you have a prescribed epinephrine auto-⁠injector, use it as directed.

Once a reaction has passed, an allergist or other healthcare provider can help you decide on next steps, including whether testing fits.

Yes. Scallop is one of the allergens in the food allergy panel, which measures IgE to several foods in one draw. Depending on the first results, follow-⁠up testing may be run on the same sample.

Each result in a panel is read the same way: sensitization is not the same as allergy, and an allergist interprets it with your history.

Lab tests are informational and don’t diagnose conditions on their own. Available to adults 18 and older; test availability varies by lab location. A licensed clinician reviews your order and, if appropriate, orders the test. All testing is performed at CLIA-certified laboratories. Not for emergencies: if you think you may be having a medical emergency, call 911.