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Pacific · Onion Allergy Test – Food Allergies

Onion Allergy Test – Food Allergies in California

This page explains the onion allergy test – food allergies, what it measures, and how to order it. An onion allergy test uses a blood sample to check for IgE antibodies that may indicate an allergic reaction to onion.

Sample typeBlood and/or urine at a collection lab
ReferralIncluded — no referral from your own doctor needed

Lab requirements in California

Here is what you need before ordering and completing the Onion Allergy Test – Food Allergies in CA. Review each item and confirm the details with the collection lab.

Physician's order
Included. A physician's order is required for lab testing and is provided for you by our partner's physicians — no referral from your own doctor is needed.
Fasting
Some tests require fasting or avoiding certain foods or drinks beforehand. You will be informed when you order — confirm the details with the collection lab.
Preparation
No special preparation is usually required, but follow the instructions provided by the collection laboratory. If you take medications, ask the lab or your clinician whether any adjustments…
Sample & visit
A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
Identification
Bring the lab requisition form from your account. The collection lab may also ask for a government-issued photo ID.
Turnaround
1-3 business days
Availability
Our partner lab does not serve ND, RI, NY, NJ, MD or HI. Confirm availability for your location with the collection lab.

Before you go

  • Order your test before visiting a lab, then use the requisition form in your account.
  • Print the requisition form, or fax it to the lab directly from your account.
  • No scheduling is needed — visit the collection lab during its normal business hours.
  • A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
  • Bring a government-issued photo ID in case the lab requests it.
  • Results are posted to your secure account within 1–3 business days.

Requirements are summarized from our partner lab's published policies. Preparation and availability can change — confirm current instructions with the collection lab before your visit.

What this test is

This test measures specific IgE antibodies in the blood that are associated with allergic sensitivity to onion. It is typically used alongside a clinical history to help evaluate whether onion may be triggering allergic symptoms.

What it measures

  • Onion-specific IgE — Reflects the level of IgE antibodies that bind to onion proteins.
  • Total IgE — Sometimes measured to provide context for allergic tendency, though not specific to onion.

What the test involves

A healthcare professional collects a small blood sample, usually from a vein in your arm, using a standard blood draw. The sample is then sent to a laboratory for analysis.

Why it is often ordered

A clinician may order this test when a person reports symptoms such as hives, itching, or digestive upset after eating onion or foods containing onion. It is often part of a broader evaluation for food allergies.

Preparation

No special preparation is usually required, but follow the instructions provided by the collection laboratory. If you take medications, ask the lab or your clinician whether any adjustments are needed.

How results are reported

Results are reported as a numeric value that is compared with a reference range established by the testing laboratory. Reference ranges can vary between laboratories, so results should be interpreted in the context of your symptoms and clinical history.

Before you go

  • Whether any medications you take could affect the test
  • The specific reference range used by the laboratory
  • How and when results will be shared with you

Cities

Onion Allergy Test – Food Allergies in California communities

Choose your city for local context and to order this test.

Los Angeles12,121,244Onion Allergy Test – Food AllergiesSan Francisco3,290,197Onion Allergy Test – Food AllergiesSan Diego3,084,174Onion Allergy Test – Food AllergiesRiverside2,022,285Onion Allergy Test – Food AllergiesSacramento1,924,167Onion Allergy Test – Food AllergiesSan Jose1,729,879Onion Allergy Test – Food AllergiesFresno719,558Onion Allergy Test – Food AllergiesConcord640,270Onion Allergy Test – Food AllergiesBakersfield590,845Onion Allergy Test – Food AllergiesMission Viejo588,540Onion Allergy Test – Food AllergiesMurrieta509,526Onion Allergy Test – Food AllergiesLong Beach466,565Onion Allergy Test – Food AllergiesOakland437,548Onion Allergy Test – Food AllergiesStockton406,822Onion Allergy Test – Food AllergiesVictorville389,060Onion Allergy Test – Food AllergiesModesto382,994Onion Allergy Test – Food AllergiesLancaster381,732Onion Allergy Test – Food AllergiesOxnard366,330Onion Allergy Test – Food AllergiesIndio361,831Onion Allergy Test – Food AllergiesAnaheim348,204Onion Allergy Test – Food AllergiesAntioch322,796Onion Allergy Test – Food AllergiesSanta Rosa314,196Onion Allergy Test – Food AllergiesSanta Ana313,818Onion Allergy Test – Food AllergiesIrvine297,868Onion Allergy Test – Food AllergiesSanta Clarita275,230Onion Allergy Test – Food AllergiesChula Vista274,818Onion Allergy Test – Food AllergiesVisalia249,804Onion Allergy Test – Food AllergiesFremont231,502Onion Allergy Test – Food AllergiesSan Bernardino220,821Onion Allergy Test – Food AllergiesThousand Oaks211,045Onion Allergy Test – Food AllergiesMoreno Valley208,371Onion Allergy Test – Food AllergiesFontana208,087Onion Allergy Test – Food AllergiesSalinas199,290Onion Allergy Test – Food AllergiesHuntington Beach198,735Onion Allergy Test – Food AllergiesSanta Barbara198,240Onion Allergy Test – Food AllergiesGlendale196,512Onion Allergy Test – Food AllergiesHemet191,170Onion Allergy Test – Food AllergiesVallejo181,882Onion Allergy Test – Food AllergiesElk Grove175,510Onion Allergy Test – Food AllergiesOntario175,223Onion Allergy Test – Food AllergiesOceanside174,461Onion Allergy Test – Food AllergiesRancho Cucamonga173,946Onion Allergy Test – Food AllergiesGarden Grove172,708Onion Allergy Test – Food AllergiesPalmdale167,987Onion Allergy Test – Food AllergiesSanta Cruz165,933Onion Allergy Test – Food AllergiesHayward162,254Onion Allergy Test – Food AllergiesCorona157,844Onion Allergy Test – Food AllergiesMerced157,617Onion Allergy Test – Food AllergiesSunnyvale155,550Onion Allergy Test – Food AllergiesPomona151,592Onion Allergy Test – Food AllergiesEscondido151,443Onion Allergy Test – Food AllergiesTorrance147,156Onion Allergy Test – Food AllergiesRoseville145,687Onion Allergy Test – Food AllergiesFairfield145,163Onion Allergy Test – Food AllergiesFullerton142,964Onion Allergy Test – Food AllergiesSanta Maria142,230Onion Allergy Test – Food AllergiesOrange139,195Onion Allergy Test – Food AllergiesPasadena138,771Onion Allergy Test – Food AllergiesYuba City129,536Onion Allergy Test – Food AllergiesSanta Clara127,922Onion Allergy Test – Food Allergies