# Intrinsic Factor Blocking Antibodies

> This test detects antibodies that attack intrinsic factor, a protein produced by the stomach that is required to absorb vitamin B12. It helps determine if your immune system is blocking B12 absorption, which is a key feature of a condition called pernicious anemia. Doctors use this result to distinguish autoimmune causes of vitamin deficiency from dietary causes. However, this test does not measure vitamin B12 levels directly, and a negative result does not completely rule out the possibility of pernicious anemia.

- Labcorp code: 010413
- Category: [Autoimmunity](https://app.picardo.health/labs/tests/autoimmunity.md)
- Price: shown at checkout, before payment.
- Blood draw: free at a Labcorp location, or $75.00 at home.
- Order link: https://app.picardo.health/labs/order?tests=010413&ref=assistant

## About ordering

A licensed physician reviews every order before any test is run, and results arrive in the person's Picardo account. Ordering is open to adults 18 and over in the US, except New York, New Jersey, Rhode Island, Pennsylvania, Maryland, Massachusetts, Hawaii and Maine. General health information, not medical advice.