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Pacific · Grapefruit Allergy Test – Citrus Allergies

Grapefruit Allergy Test – Citrus Allergies in California

Below is a plain-language overview of the grapefruit allergy test – citrus allergies. A grapefruit allergy test checks for allergic antibodies in your blood that may react to grapefruit or related citrus fruits. It can help explain symptoms that appear after eating or touching these fruits.

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 Grapefruit Allergy Test – Citrus 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
Fasting is required for this test — follow the collection lab's instructions.
Preparation
Preparation is usually minimal, but specific instructions can vary by collection site. Follow the lab's instructions and ask the collecting laboratory if you have questions about…
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, which are proteins the immune system can make in response to allergens. A blood sample is analyzed to see whether antibodies that bind to grapefruit proteins are present. Results are interpreted alongside your symptom history and other allergy testing.

What it measures

  • Grapefruit-specific IgE — Reflects immune system sensitization to grapefruit proteins
  • Citrus cross-reactive IgE — May indicate antibody binding to related citrus allergens
  • Total IgE — Sometimes included as a general measure of allergic antibody level

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 someone reports symptoms such as itching, hives, swelling, or digestive upset after eating grapefruit or other citrus fruits. It is typically used with a detailed history to help evaluate whether an allergy is possible.

Preparation

Preparation is usually minimal, but specific instructions can vary by collection site. Follow the lab's instructions and ask the collecting laboratory if you have questions about medications, fasting, or timing.

How results are reported

Results are reported as a numerical level or a qualitative category, depending on the laboratory method used. Reference ranges and reporting formats vary by laboratory, so results should always be interpreted in the context of the lab that performed the test and your overall clinical picture.

Before you go

  • Whether any medications or foods need to be avoided before the blood draw
  • How long results usually take at that specific laboratory
  • Whether a repeat or additional allergy test is recommended based on your symptoms

Cities

Grapefruit Allergy Test – Citrus Allergies in California communities

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

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