Intrinsic Factor Antibody

Also referred as

Intrinsic Factor Antibody Test

IF Antibody Test

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The Intrinsic Factor Antibody test detects Immunoglobulin G (IgG) antibodies against intrinsic factor, which is crucial for vitamin B12 absorption. It helps identify pernicious anemia (an autoimmune cause of B12 deficiency).

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Blood

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Understanding Intrinsic Factor Antibody

Intrinsic factor (IF) is a glycoprotein produced in the stomach lining cells. IF binds to vitamin B12 and enables its absorption in the small intestine. The Intrinsic Factor Antibody test checks for the presence of autoantibodies that target this protein. These antibodies can reduce/block B12 absorption, leading to pernicious anemia, a common cause of vitamin B12 deficiency.

Doctors may advise the Intrinsic Factor Antibody test if there are symptoms such as fatigue, weakness, numbness, or memory issues, or if there's clinical suspicion of B12 deficiency without dietary causes. It may be ordered alongside other tests like serum B12, methylmalonic acid (MMA), or homocysteine to confirm diagnosis.

Early detection of intrinsic factor antibodies helps in initiating appropriate treatment and preventing long-term neurological complications due to prolonged vitamin B12 deficiency.

No special preparation is required for the Intrinsic Factor Antibody test. Inform the doctor about all the medications and supplements currently being taken, as some of them may affect the test results. Your doctor may advise changes, if needed, before the test.

Test result ranges are approximate and may differ slightly between labs depending on the methodology and laboratory guidelines. Do not self-medicate and always consult a doctor to understand the test results correctly.

Please note: This is an outsourced test. The sample is collected by TATA 1MG and processed at a NABL accredited partnered lab.

What does Intrinsic Factor Antibody measure?

The Intrinsic Factor Antibody is a blood test that measures the presence of autoantibodies that attack intrinsic factor, preventing vitamin B12 absorption in the intestine. Positive results suggest pernicious anemia/autoimmune gastritis as a likely cause of B12 deficiency.

Test Information is reviewed by: Dr. Swati Gupta (Anand), MBBS, MD Lab Medicine and written by Dr. Lipika Khurana, PGDHHM, BDS . The test details are for information purpose only. Consult a doctor before taking any test. Last updated on: 2nd Sep 2026

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Intrinsic Factor Antibody test price for other cities

Price in	Bangalore	Rs. 2299
Price in	Mumbai	Rs. 2439
Price in	Kolkata	Rs. 2339
Price in	Chennai	Rs. 2469
Price in	New Delhi	Rs. 2409

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FAQs related to Intrinsic Factor Antibody

What is the Intrinsic Factor Antibody test?

The Intrinsic Factor Antibody test detects antibodies that block the action of intrinsic factor, a protein required for absorbing vitamin B12 from the diet.

Do I need to fast before the Intrinsic Factor Antibody test?

No, fasting is not required for this test. However, follow your doctor’s instructions closely.

How is the Intrinsic Factor Antibody test performed?

A blood sample is collected from a vein and analyzed using ELISA technology, a lab method to detect antibodies, in the laboratory.

Is there any risk associated with the Intrinsic Factor Antibody test?

No, the Intrinsic Factor Antibody test is generally safe with minimal risks. You may feel slight discomfort, bruising, or swelling at the blood draw site, which resolves on its own and is not bothersome.

Who should get tested?

Individuals with symptoms of vitamin B12 deficiency or those with anemia, numbness, memory issues, or suspected autoimmune disorders affecting the stomach can get the Intrinsic Factor Antibody test.

What does a positive result mean?

A positive test suggests the presence of intrinsic factor antibodies, which can be seen in pernicious anemia and some autoimmune conditions.

Can the Intrinsic Factor Antibody help confirm B12 deficiency?

The Intrinsic Factor Antibody supports the diagnosis, especially when combined with serum B12 levels and other related tests like homocysteine or MMA.

Can medications affect the results?

Generally, medications do not interfere with antibody detection, but it is best to inform your doctor of all medicines and supplements.

How does Tata 1mg ensure accurate lab test results?

Tata 1mg ensures accurate lab test results through certified laboratories that use advanced technology and adhere to stringent quality control measures. This commitment to high standards guarantees reliable results.

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