Grapefruit Allergy Test
Below is a plain-language overview of the grapefruit allergy test. A grapefruit allergy test checks your blood for antibodies that may indicate an allergic response to grapefruit. It is usually ordered when someone has had symptoms like itching, hives, or swelling after eating or touching grapefruit, and the cause is unclear.
- Sample type
- blood
- Category
- Allergy
- Turnaround
- 1-3 business days
- Price
- $49
- Referral
- Not required
A grapefruit allergy test checks your blood for antibodies that may indicate an allergic response to grapefruit. It is usually ordered when someone has had symptoms like itching, hives, or swelling after eating or touching grapefruit, and the cause is unclear.
What it measures
- Specific IgE to grapefruit — The main marker; it measures antibodies your immune system may make against grapefruit proteins.
- Total IgE — A general allergy antibody level that can help show an allergic tendency, though it is not specific to grapefruit.
- Component allergens (if done) — Individual grapefruit proteins that can help clarify which part of the fruit may trigger symptoms.
Who it is for
This test is typically ordered by an allergist or primary care clinician for people who have had allergic symptoms after eating, drinking, or handling grapefruit or related citrus fruits.
Preparation
No fasting or special preparation is usually required. Tell your clinician about any medications you take, especially antihistamines, as they may affect test results.
Results and what they mean
Results are reported as a level or class for each marker, often alongside a reference range. A higher level may suggest allergy, but results are interpreted together with your symptoms and history. Only a clinician can confirm an allergy; this information is general and not medical advice.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the grapefruit allergy test is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
Do I need to avoid grapefruit before the test?
No. The blood test measures antibodies and does not require you to eat or avoid grapefruit beforehand.
Can this test tell me if I am truly allergic?
It can show whether you have antibodies to grapefruit, but it cannot diagnose an allergy on its own. Your clinician will consider your symptoms and may recommend other tests.
How long does it take to get results?
Results are typically available within 1 to 3 business days.
Is the test painful?
It is a standard blood draw, which feels like a brief pinch. Most people tolerate it well.