Food reactions can be confusing—especially when your symptoms do not fit neatly into one category. You might get hives after shrimp yet feel bloated and foggy after bread. One reaction can be immediate and dangerous. The other is delayed and nagging.
This guide explains the difference between allergies and sensitivities, which tests are reliable, what they cost, and how to take smart next steps for yourself or your family.
Allergies vs. Sensitivities: What Is the Difference?
Food Allergy
A food allergy is an IgE-mediated immune reaction. Symptoms appear within minutes to a few hours and may include:
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Hives
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Swelling
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Wheezing
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Vomiting
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Anaphylaxis
Allergies require strict avoidance and an emergency plan. Testing for IgE is well established.
Food Sensitivity or Intolerance
Food sensitivities are non-IgE reactions. They may be immune-mediated through other pathways or non-immune (such as enzyme deficiencies). Symptoms often appear hours to days later and may include:
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Bloating, gas, cramping
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Diarrhea or constipation
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Headaches, brain fog, fatigue
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Joint aches
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Skin flares
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Mood changes
Common Sensitivity & Intolerance Types
Non-IgE Immune Reactions
Sometimes connected to IgG or IgA responses, mast cell activation, or histamine intolerance.
Enzymatic Intolerance
Example: lactose intolerance due to low lactase.
FODMAP Sensitivity
Reactions to fermentable carbohydrates that feed gut bacteria.
Histamine Intolerance
Flushing, headaches, congestion, or hives after high-histamine foods.
Gluten-Related Disorders
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Celiac disease: autoimmune
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Non-celiac gluten sensitivity: non-autoimmune, non-IgE
Which Tests Are Accurate?
IgE Allergy Testing
Skin prick testing and serum-specific IgE blood tests are the standard for identifying true food allergies. Combined with your clinical history, they are reliable and often covered by insurance when medically indicated.
IgG or IgA Food Sensitivity Testing
These tests measure antibodies to foods. They may reflect exposure or changes in gut barrier integrity, not a true allergy.
Evidence is mixed on whether elevated IgG indicates a symptom-causing sensitivity. False positives are common, especially for foods you eat frequently.
We may use IgG or combined IgG/IgA panels as a map to guide an elimination trial—not as a standalone verdict.
Elimination and Re-challenge (Gold Standard)
Remove suspected foods for 6–8 weeks, then reintroduce one at a time while tracking symptoms. It requires structure, but it offers the clearest answers.
Functional Gut Testing (When Symptoms Persist)
If symptoms continue despite diet changes, root causes may be driving sensitivities:
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SIBO
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Dysbiosis
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Low stomach acid
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Pancreatic insufficiency
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Intestinal permeability
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Chronic inflammation
Testing can help identify these patterns.
Where Testing Can Help
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GI-MAP stool testing to assess dysbiosis, inflammation, digestion, and pathogens
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SIBO breath testing for hydrogen or methane overgrowth
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Intestinal permeability testing for “leaky gut”
Pros and Cons of Common Tests
IgE Allergy Blood or Skin Tests
Pros:
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Validated for immediate allergies
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Guides safe avoidance and emergency planning
Cons:
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Do not detect sensitivities
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Must be interpreted alongside your history
IgG or IgA Food Panels
Pros:
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Helpful when symptoms are widespread and hard to pinpoint
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May highlight candidates for elimination
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May reflect gut barrier issues
Cons:
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Not diagnostic
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High false-positive rate
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Risk of over-restriction without context
Elimination & Re-challenge
Pros:
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Most accurate for sensitivities
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Shows clear cause and effect
Cons:
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Requires planning and patience
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Best done with guidance to maintain balanced nutrition
Costs and Insurance Basics
Food Allergy Testing (IgE)
If ordered by an in-network clinician, testing may be partly or fully covered.
Without insurance: $150–$500, depending on the number of foods.
Skin testing varies by allergist and scope.
Food Sensitivity Testing (IgG/IgA)
Many insurers do not cover these panels.
Out-of-pocket range: $150–$450+, depending on the panel.
Functional Gut Tests
Often cash-pay, with optional HSA/FSA reimbursement. Occasionally partial coverage with some PPO plans. Pricing varies by lab and depth of analysis.
Who Should You See?
Which Doctor Does Food Sensitivity Testing?
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Allergists evaluate suspected IgE allergies.
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Functional or naturopathic clinicians address sensitivities, gut-driven issues, elimination protocols, and specialty testing.
Dr. Galina, a functional medicine practitioner in Chicago, offers these labs and more, with careful test selection and nutrition coaching. She works virtually across many states.
Can You Ask Your Doctor for a Food Intolerance Test?
Yes.
Start with your primary care doctor or an allergist if symptoms are immediate.
For delayed reactions, digestive issues, or systemic symptoms, a naturopathic or functional clinician can design a targeted plan.
How Do You Get a Food Sensitivity Test?
We start with your history and symptom timeline.
Some panels are at-home finger-stick kits; others require a blood draw.
We always pair testing with structured elimination and reintroduction so results lead to clarity—not confusion.
If your pattern suggests SIBO or dysbiosis, we may prioritize a gut health lab test or SIBO breath test first.
Is It Worth Getting a Food Sensitivity Test?
It depends on your symptoms and goals:
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If you have a few likely triggers → elimination may be faster.
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If your symptoms are widespread or linked to gut barrier problems → testing can help create a starting map.
True value comes from interpretation + a personalized plan.
Three Common Symptoms of Food Intolerance
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Bloating or abdominal pain after meals
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Diarrhea, constipation, or mixed bowel habits
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Headaches, brain fog, fatigue, skin flares, or congestion hours after eating
If you have throat swelling, breathing difficulty, or rapid-onset hives after eating, seek emergency care and follow up with an allergist.
How Functional Medicine Finds Root Causes
Food reactions often occur because of underlying gut or immune issues, such as:
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SIBO or dysbiosis
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Low stomach acid or enzyme insufficiency
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Intestinal permeability
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Histamine overload
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Stress or poor sleep affecting gut motility
We use tests such as GI-MAP, SIBO breath testing, or intestinal permeability assessments only when they will change your plan.
Then we rebuild tolerance with digestive support, microbiome balancing, and stepwise food reintroduction.
Practical Next Steps for Women and Families
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Track patterns (1–2 weeks).
Log meals, symptoms, stress, sleep, and menstrual cycle phase. -
Trial a focused elimination (minimum 3–4 weeks, up to 6-8 weeks).
Common starting points include dairy, gluten, soy, eggs, and high-FODMAP triggers. -
Reintroduce methodically.
Add one food every 3 days and rate symptoms (0–10) for 48 hours. -
Support digestion.
Eat slowly, add bitters before meals, and consider digestive enzymes if recommended. -
Heal the gut.
Address constipation, add targeted probiotics or nutrients, and test for SIBO/dysbiosis if symptoms persist. -
Personalize the plan.
Your nutrition strategy should be sustainable and nutrient-balanced.
If you prefer structured guidance, you can schedule an initial consultation with labs or book a follow-up consultation to refine your plan. Dr. Galina works virtually, in Chicago and beyond.
How We Work Together
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Comprehensive intake: Symptoms, medical history, and goals
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Targeted testing: Usually necessary in most cases, but only when it will change decisions
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Personalized plan: Nutrition strategy, digestive support, and reintroduction steps
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Ongoing support: Adjustments based on your response and life season
Summary
Food allergies and sensitivities require different tools and approaches.
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IgE testing is reliable for immediate, potentially dangerous allergies.
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For delayed reactions, elimination and re-challenge remains the gold standard.
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IgG/IgA panels can be helpful when used in context—not in isolation.
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Costs and insurance vary, so choose tests that will truly guide your care.
If you are ready to move from guessing to clarity, our practice offers root-cause evaluation, selective testing, and practical nutrition plans for women and families.