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Midwest · Onion Allergy Test – Food Allergies

Onion Allergy Test – Food Allergies in Missouri

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 Missouri

Here is what you need before ordering and completing the Onion Allergy Test – Food Allergies in MO. 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 Missouri communities

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

St. Louis2,092,481Onion Allergy Test – Food AllergiesKansas City1,644,497Onion Allergy Test – Food AllergiesSpringfield298,722Onion Allergy Test – Food AllergiesColumbia136,736Onion Allergy Test – Food AllergiesIndependence122,230Onion Allergy Test – Food AllergiesLee's Summit100,772Onion Allergy Test – Food AllergiesO'Fallon90,802Onion Allergy Test – Food AllergiesJoplin81,025Onion Allergy Test – Food AllergiesSt. Joseph80,099Onion Allergy Test – Food AllergiesSt. Charles70,218Onion Allergy Test – Food AllergiesBlue Springs58,265Onion Allergy Test – Food AllergiesSt. Peters57,289Onion Allergy Test – Food AllergiesFlorissant52,382Onion Allergy Test – Food AllergiesChesterfield49,675Onion Allergy Test – Food AllergiesWentzville43,213Onion Allergy Test – Food AllergiesJefferson City43,076Onion Allergy Test – Food AllergiesCape Girardeau39,415Onion Allergy Test – Food AllergiesWildwood35,384Onion Allergy Test – Food AllergiesOakville35,357Onion Allergy Test – Food AllergiesUniversity City34,953Onion Allergy Test – Food AllergiesBallwin30,998Onion Allergy Test – Food AllergiesLiberty30,129Onion Allergy Test – Food AllergiesRaytown29,893Onion Allergy Test – Food AllergiesKirkwood29,233Onion Allergy Test – Food AllergiesMehlville28,672Onion Allergy Test – Food AllergiesMaryland Heights28,141Onion Allergy Test – Food AllergiesGladstone26,825Onion Allergy Test – Food AllergiesGrandview25,931Onion Allergy Test – Food AllergiesHazelwood25,466Onion Allergy Test – Food AllergiesBelton23,832Onion Allergy Test – Food AllergiesWebster Groves23,817Onion Allergy Test – Food AllergiesNixa22,925Onion Allergy Test – Food AllergiesRaymore22,722Onion Allergy Test – Food AllergiesSedalia21,696Onion Allergy Test – Food AllergiesOzark20,874Onion Allergy Test – Food AllergiesArnold20,808Onion Allergy Test – Food AllergiesOld Jamestown20,382Onion Allergy Test – Food AllergiesRolla19,949Onion Allergy Test – Food AllergiesWarrensburg19,509Onion Allergy Test – Food AllergiesAffton18,925Onion Allergy Test – Food AllergiesFerguson18,826Onion Allergy Test – Food AllergiesConcord18,760Onion Allergy Test – Food AllergiesCreve Coeur18,648Onion Allergy Test – Food AllergiesRepublic18,313Onion Allergy Test – Food AllergiesManchester18,308Onion Allergy Test – Food AllergiesFarmington17,959Onion Allergy Test – Food AllergiesSpanish Lake17,721Onion Allergy Test – Food AllergiesKirksville17,600Onion Allergy Test – Food AllergiesHannibal17,165Onion Allergy Test – Food AllergiesClayton16,905Onion Allergy Test – Food AllergiesLake St. Louis16,665Onion Allergy Test – Food AllergiesPoplar Bluff16,318Onion Allergy Test – Food AllergiesLemay16,312Onion Allergy Test – Food AllergiesSikeston16,054Onion Allergy Test – Food AllergiesOverland15,908Onion Allergy Test – Food AllergiesFort Leonard Wood15,629Onion Allergy Test – Food AllergiesGrain Valley15,435Onion Allergy Test – Food AllergiesCarthage15,395Onion Allergy Test – Food AllergiesJackson15,272Onion Allergy Test – Food AllergiesLebanon14,880Onion Allergy Test – Food Allergies