FIT (Food Intolerance Test)

TEST : FIT (Food Intolerance Test)
OTHER TEST REQUEST NAME :

FIT

Food Intolerance Test

TEST COMPOSITION :

Not applicable

INTENDED USE :
  • To identify food specific IgG antibodies to foods that are being consumed.
  • To determine individual’s abnormal reaction to certain food item that can manifest into chronic “delayed onset” symptoms.
METHODOLOGY :

Immunoassay based on Microarray technology

LABORATORY SECTION :

Serology

SPECIAL INSTRUCTIONS/PATIENT PREPARATIONS :

No patient preparation necessary.

COLLECTION/SAMPLE CONTAINER :

EDTA tube

Note: 1 piece 4ml capacity EDTA tube

SPECIMEN AND VOLUME REQUIREMENT
Note: Follow tube manufacturer recommendation.
:

1-2mL plasma

ALTERNATIVE SPECIMEN AND VOLUME REQUIREMENT :

Not Applicable

SPECIMEN STABILITY    
•   ROOM TEMPERATURE (15-25°C) :

Not Specified

•   REFRIGERATED TEMPERATURE (2-8°C) :

Not Specified

•   FREEZER TEMPERATURE (-20°C) :

14 Days

TRANSPORT TEMPERATURE :
  • Blood specimen should be transported at 15°C to -20°C to HPD Main Laboratory within 24 hours.
  • Storage at HPD Laboratory is at -20 °C
REJECTION CRITERIA :
  • Any degree of hemolysis
  • Icteric samples
  • Lipemic samples
  • Quantity not sufficient
  • Improperly labeled transport tube
  • Exceeded sample stability requirement
RUNNING DAY :

Batch running; Tuesday and Friday

 

CUT OFF TIME :

Not Applicable

TAT/RELEASING OF RESULTS :
  • After 9 working  days (7 days TAT for Test Analysis and 2 days TAT for shipment of results) excluding Saturdays, Sundays and Holidays
  • Results are not available online.
  • Patient will be the one to pick up the result.
  • For all requests received starting July 3, 2018:  

    • No more free delivery of results to patient’s address.

            • If patients request to deliver the result, Courier Fee will be charged. 

 

REFERENCE INTERVAL/RESULT INTERPRETATION :

NEGATIVE: <24 U/mL

BORDERLINE: 24-30 U/mL

POSITIVE: >30 U/mL

LIMITATIONS/INTERFERENCES :

 

Food Intolerance Test is recommended for age two (2) years old and above.

FREQUENTLY ASKED QUESTIONS (FAQS) :
  1.  I have been avoiding a food for several months/years. Will this affect my test results?

This test is based on the immune system’s ability to produce antibodies in response to certain food. If a food has been avoided for more than 3 months, it is likely that IgG antibody levels will be insufficient to be detected by the test and may give a normal result. To test intolerance to a certain food, it should be included in the daily diet, or at least every other day, for 4-6 weeks before testing. However, if the food concerned is known to cause extreme symptoms/discomfort, do not reintroduce it.

 

  1. Do I need to visit a nutritionist to discuss the test results?

Once you have received your test results, it is advisable to consult a nutritionist who can help advise on dietary changes and provide a supplement program. They may also offer support and encouragement with regular progress checks, as it can be quite a daunting task to persevere with a new diet on your own.

 

  1. If Cow’s Milk is elevated, does this mean that I am lactose intolerant?

No. Lactose intolerance is the inability to digest lactose, the major sugar found in milk, and is caused by a deficiency of the enzyme lactase. The Food Intolerance Test detects IgG-mediated food intolerance caused by specific proteins found in milk, but does not detect the lactase enzyme and, therefore cannot diagnose lactose intolerance.

 

  1. Is this test suitable for testing children?

Yes, but we recommend a minimum age limit of 2 years.

 

  1. Do I need to have a re-test after a few months?

Most people do not need to have a re-test, but if you would like to take another test, we advise a period of 6 months between tests. If symptoms have improved and you have successfully re-introduced “problem” food, a re-test is necessary.

 

  1. Why do I react against a food that I have never eaten?

It is occasionally observed that patients react to food that they are convinced they have never eaten. Although not unusual, it is attributable to a false positive result, but instead a “cross-reaction” with another food. Some food contain identical antigens (food proteins), even though they are not related to each other and/or do not belong to the same food group. These identical proteins will be detected by the same antibody, thus producing an elevated result.

 

  1. What if I don’t experience any improvement at all?

If, after changing your diet according to test results, improvements have not been achieved after 3 months, food intolerance is unlikely to be the cause of your symptoms and other investigations should be undertaken. Results of the Food Intolerance Test are intended as a guide to diet alteration only and should be complementary to advice from a healthcare professional.

RELATED WORDS/TEST :

Food Hypersensitivity, Non-IgE mediated, Delayed Hypersensitivity, IgG mediated Allergy

 

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