What to check
Note what food you ate, how much and which symptoms followed. Also note how soon symptoms appeared and whether they recur.
Food restrictions and test results
A food-specific IgG result alone is not enough to identify the cause of symptoms or start a long-term elimination diet. Ask your physician to explain what the test means and its limitations.
How to discuss your diet
Bring any food diary or previous allergy test results to your consultation. If needed, discuss how this relates to standard allergy assessment.
Interpreting food-specific IgG results
Food-specific IgG antibodies can occur in people without food allergies. The Japanese Society of Allergology does not recommend this test to identify foods responsible for a food allergy. A positive result for a food does not establish that it caused your symptoms.
If you want to discuss symptoms after eating, note what you ate, what symptoms you had and how soon they occurred. Avoiding many foods based solely on test results can affect your diet and nutrition. Discuss the course of your symptoms with a physician before continuing any food restrictions you started on your own.
| What to record | Details |
|---|---|
| What you ate | Food, dish and amount eaten |
| Symptoms | What symptoms you had and how long they lasted |
| Timing | Time from eating to the onset of symptoms |
| Recurrence | Whether it recurs with the same food or circumstances |
This table helps you prepare for a consultation. It does not identify foods responsible for symptoms or guide you to test your reaction by trying foods.
Precautions and risks
An unnecessary elimination diet based solely on test values can lead to an unbalanced diet. Do not use this test in place of food allergy diagnosis or treatment.
This is an overview. Please consider a treatment or test after receiving an explanation specific to your care.
Role of the test
This page provides background information for people considering food-specific IgG testing. The test is not recommended for identifying foods responsible for a food allergy. The page does not direct you to purchase the test or start an elimination diet on your own.
If you have symptoms after eating, describe how they have developed at a routine medical consultation.
What to check before your consultation
- Does this test diagnose allergies?
- What medical evidence supports recommending this test?
- Do I need to start restricting my diet?
Write down your questions and bring them with your medication record and previous test results.
Symptoms after eating and general internal medicineReference information
The general explanation was added on 10 September 2026. The references do not establish which products the clinic uses or indicate approval of an individual service.