Delayed Food Reaction Blood Test

What is Delayed Food Reaction?

Delayed food reactions are immune responses that occur hours or days after consuming certain foods, making them difficult to identify without testing. These reactions are caused by elevated IgG antibodies that your immune system produces against specific foods it perceives as problematic. The Red Kidney Bean IgG test is the most important test for diagnosing delayed reactions to this specific food trigger.

RECOMMENDED TEST Red Kidney Bean (f287) IgG
Google reviews 505 reviews
$243 $190
What's included
Fast & easy, results by email & SMS
No extra fees paid at the lab
No need to visit a doctor
Private & confidential
No insurance needed
Results explained
Why Private MD Labs?
90-day money-back guarantee Lab order in minutes Save a trip to the doctor Low prices since 2005 Labs within 2 miles

What causes delayed food reactions?

Delayed food reactions are caused by elevated IgG antibodies that your immune system produces in response to foods it identifies as threats. Unlike immediate IgE-mediated allergies, these IgG responses trigger inflammation and symptoms anywhere from 2 to 72 hours after eating the offending food. Common trigger foods include dairy, gluten, eggs, soy, and certain legumes like red kidney beans, though any food can potentially cause a delayed reaction in susceptible individuals.

What is the best test for delayed food reactions?

The Red Kidney Bean IgG test is the most important test for identifying delayed reactions to this specific food because it measures IgG antibody levels that indicate your immune system is mounting a response. Elevated IgG antibodies to red kidney beans suggest your body perceives this food as problematic, which can contribute to symptoms like digestive issues, headaches, fatigue, or skin problems that appear hours or days after eating. For comprehensive food sensitivity screening, multiple IgG tests targeting different foods can be ordered to create a complete picture of your dietary triggers.

When should I get tested for delayed food reactions?

You should get tested if you experience persistent symptoms like bloating, digestive discomfort, headaches, fatigue, joint pain, or skin issues that don't improve despite eliminating obvious allergens. Testing is especially important if your symptoms appear inconsistently or seem unrelated to what you just ate, which is characteristic of delayed reactions. You should also consider testing if you have inflammatory conditions, autoimmune disorders, or chronic health issues that haven't responded well to conventional treatment, as food sensitivities often contribute to these problems.

What are the symptoms of delayed food reactions?
Delayed food reactions cause diverse symptoms including digestive issues like bloating, gas, diarrhea, or constipation, as well as headaches, migraines, fatigue, brain fog, and difficulty concentrating. You might also experience skin problems such as eczema, acne, or rashes, joint pain and stiffness, sinus congestion, or mood changes like anxiety and irritability. Because symptoms can take 2 to 72 hours to appear after eating the trigger food, they are often mistaken for other health conditions, making them particularly challenging to identify without proper testing.
Who is at risk for delayed food reactions?
People with autoimmune conditions, inflammatory bowel disease, leaky gut syndrome, or chronic inflammation are at higher risk for developing delayed food reactions. Those with a family history of food sensitivities, allergies, or immune disorders also face increased risk. Additionally, individuals who have experienced prolonged stress, frequent antibiotic use, poor diet, or intestinal infections may develop food sensitivities because these factors can compromise gut barrier function and alter immune responses to foods.
What happens if delayed food reactions are left untreated?
Untreated delayed food reactions can lead to chronic inflammation throughout your body, which contributes to persistent digestive problems, nutrient malabsorption, and deficiencies in essential vitamins and minerals. Ongoing exposure to trigger foods can worsen existing autoimmune conditions, increase intestinal permeability (leaky gut), and potentially trigger new sensitivities to additional foods. Over time, this chronic immune activation can contribute to more serious health issues including inflammatory bowel disease, arthritis, chronic fatigue syndrome, and neurological symptoms that significantly impact your quality of life.
Can delayed food reactions be diagnosed with a blood test?
Yes, delayed food reactions can be diagnosed with blood tests that measure IgG antibodies specific to individual foods. The IgG antibody test identifies which foods are triggering an immune response in your body by detecting elevated antibody levels that indicate your system perceives certain foods as problematic. While these tests provide valuable information about potential food triggers, results should be interpreted alongside your symptoms and dietary history by a qualified healthcare provider who can help you develop an appropriate elimination and reintroduction plan.
How are delayed food reactions treated?
Delayed food reactions are treated primarily through temporary elimination of identified trigger foods from your diet for 3 to 6 months, allowing your immune system to calm down and your gut to heal. After the elimination period, foods are carefully reintroduced one at a time while monitoring for symptom recurrence to determine which foods you can tolerate. Treatment may also include gut healing protocols with probiotics, digestive enzymes, and supplements like L-glutamine, zinc, and omega-3 fatty acids to restore intestinal barrier function and reduce overall inflammation.
How can I prevent delayed food reactions?
You can prevent delayed food reactions by maintaining a healthy gut through eating a diverse, whole-foods diet rich in fiber, fermented foods, and anti-inflammatory nutrients that support beneficial gut bacteria. Avoid overconsuming the same foods repeatedly, as eating the same items daily can increase the risk of developing sensitivities. Managing stress through regular exercise, adequate sleep, and relaxation techniques also helps maintain healthy gut barrier function and immune regulation, reducing your susceptibility to developing new food sensitivities.
What natural remedies help with delayed food reactions?
Natural remedies that help with delayed food reactions include probiotics to restore healthy gut bacteria, digestive enzymes to improve food breakdown and reduce immune triggers, and bone broth which provides collagen and amino acids that heal the intestinal lining. Supplements like L-glutamine, zinc, and quercetin support gut barrier repair and reduce inflammation, while omega-3 fatty acids from fish oil help modulate immune responses. Additionally, herbal remedies such as ginger, turmeric, and slippery elm can soothe digestive inflammation and support overall gut healing when combined with an elimination diet.
How’s this work?
Getting your blood test with us is easy, private & backed by the power of science.

Long story short:
  1. In the test options, use the filters or search box to narrow your choices and find the test you want.
  2. If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test.
  3. Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout.
  4. If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want.
  5. When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system.
  6. Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way.
  7. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!
  8. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.
How do I know which test to get?
In the test options, find the test you want. If you’re not sure which test to get, we can lend a hand in finding the right option.

Just text or call us at 754-799-7833, email us at support@privatemdlabs.com, and we'll gladly help you. We've got your back and reply quickly.
Is it possible to make changes to my lab order if I made a mistake with the name, date of birth, or any other details?
Absolutely! We totally understand that errors can happen. No worries, we're here to help you.

Just reach out to us via text at 754-799-7833 or shoot us an email at support@privatemdlabs.com. Remember to include your order number and let us know the correct information you’d like to update. Our awesome team will jump right in and make sure everything is sorted out and accurate for you.

There are no changes necessary if your address is wrong on the requisition though. We don’t mail anything out.

Our lab requires an address to be listed to generate an order.
Do you accept health insurance?
Only HSA & FSA is accepted.

Our services are strictly self-pay and cannot be submitted to your health insurance provider except for Health Savings Accounts or Flexible Savings Accounts.

This policy applies to all insurance companies, including federal health insurance programs like Medicare.

If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com.
Can I cancel my order?
Yes.

We get it – sometimes your needs change.

As long as your samples haven’t been collected yet, we’re happy to help you cancel your order.

If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com.

You can read more about our cancellation policy here.
How can I find a lab location near me?
During the ordering process, you’ll be able to select a specific lab near you, with no strings attached! You can switch it up later easily and visit any of our authorized locations as long as it’s the same lab company you selected your test for (Quest Diagnostics or Labcorp).

Before you proceed with your order, feel free to browse through all our lab locations here. This will give you the peace of mind of knowing that there's a lab nearby your home, office or your favorite gym.

If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.
Here’s how easy it is to get blood work done on your terms
Choose a checkup
Order your test Save a trip to the doctor. Your results will come with clear, friendly explanations. Takes 2 minutes
Book a lab
Book an appointment Visit any of our 4,000 nearby lab locations to have your samples collected. Book or walk-in
Choose a checkup
Get results Receive a clear, easy-to-digest health report by email & SMS within a few business days. Get answers, fast

Here’s why 1,000,000+ customers chose us for affordable hassle-free private blood testing.

You get clinical lab reports & simplified health insights.
Save time & gas, go straight to the lab. Our doctors cover the rest.
Results start landing the next day after your lab visit.*
We don’t sell or share your data. Your time & privacy matter.
US-licensed doctors have your back if things get unclear.
No hidden fees, nice discounts for regular checkups.
Save a trip to the doctor, go directly to the lab
Instant orders, results often overnight*
Results explained in simple language
Reviewed by US licensed doctors
Fast & confidential, we never sell or share your data
No insurance needed, transparent pricing
Demo results
Testosterone 375 ng/dL
Demo results
Normal Optimal 400 - 1000 High
375 ng/dL

What this means

Your testosterone levels are slightly below the optimal range. While this is not necessarily cause for concern, it may contribute to occasional fatigue, reduced motivation, or lower muscle mass over time.

* Regular blood test results (e.g., CBC) typically start arriving the next business day after sample collection. More complex tests, such as hormone panels, may take up to 10–15 business days due to their complexity.

Us vs. Them

Not overhyped or overpriced. Just comprehensive blood testing made simple and for everyone.

* Regular blood test results (e.g., CBC) typically start arriving the next business day after sample collection. More complex tests, such as hormone panels, may take up to 10–15 business days due to their complexity.

1,000,000+ blood tests later, here's what our customers say

Google reviews 505 reviews Next
Red Kidney Bean (f287) IgG
Google reviews 505 reviews
$243 $190
What's included
Fast & easy, results by email & SMS
No need to visit a doctor
Private & confidential
No insurance needed
Results explained
No extra fees paid at the lab

Sample results

Sample image
For you & your coach Health insights Written in human language, backed by science.
Sample image
For you & your doc Classic lab report A familiar and comprehensive lab report.

Ask AI

Your 24/7 Lab Guide

Quick questions:

Which test is right for my symptoms?
What could be causing this?
When should I get tested?
A
Hi, I'm AI. I can help you find the right test, explain results, or prepare for your visit. What can I help with?
Just now
A
AI provides insights, not medical diagnoses.