--- title: Intrinsic Factor Blocking Antibody Test type: test id: intrinsic-factor-antibody url: "https://www.test-well.com/tests/intrinsic-factor-antibody" price_usd: 159.99 lab_fee_usd: 6 all_in_usd: 165.99 category: Iron & Anemia sample: Blood draw fasting_required: false results_in: "3–5 business days" labs: - Quest - Labcorp orderable: true reviewed_at: 2026-10-28 order_url: "https://www.test-well.com/cart?add=intrinsic-factor-antibody&utm_source=ai_agent&utm_medium=markdown" --- # Intrinsic Factor Blocking Antibody Test > The specific blood test for pernicious anemia — antibodies that block intrinsic factor, the protein your stomach makes so you can absorb vitamin B12, measured from a standard blood draw. At TestWell it costs $159.99 plus a $6 lab processing fee, needs no fasting, and results post in 3–5 business days. Physician-authorized with no doctor's visit or insurance needed; draw at Quest or Labcorp. **On your lab requisition:** Labcorp "Intrinsic Factor Abs, Serum" (test no. 010413) ## Key facts | Fact | Value | | --- | --- | | Price | $159.99 + $6 lab processing fee per order ($165.99 all-in for this test alone) | | Sample | Blood draw | | Fasting | Not required | | Results | 3–5 business days | | Labs | Quest Diagnostics, Labcorp | | Biomarkers measured | 1 | | Physician authorization | Included — no doctor's visit, referral or insurance needed | | Payment | Card, HSA or FSA; cash-pay only (no insurance billing) | ## What does the Intrinsic Factor Blocking Antibody test tell you? The specific blood test for pernicious anemia — antibodies that block intrinsic factor, the protein your stomach makes so you can absorb vitamin B12. Intrinsic factor is made by the stomach's parietal cells and binds vitamin B12 so the small intestine can absorb it. In pernicious anemia the immune system makes antibodies against intrinsic factor, B12 cannot be absorbed from food or ordinary oral supplements, and the deficiency develops over years: fatigue, a large-cell (macrocytic) anemia, and sometimes numbness, balance problems or memory changes that can become permanent if the deficiency is missed. A positive intrinsic factor blocking antibody is highly specific — in a person with low B12 it confirms pernicious anemia — but it is only found in about half to two-thirds of cases, so a negative result does not rule the condition out; the parietal cell antibody is more sensitive and less specific, and the two are usually read together with a B12 level and a complete blood count. Order this test if your B12 is low or borderline without an obvious dietary cause, if you have an unexplained macrocytic anemia, or if you have another autoimmune condition (autoimmune thyroid disease, type 1 diabetes, vitiligo) and new fatigue or neurological symptoms. A recent B12 injection can produce a false positive on some assays; draw before an injection or a week or more after one. Run at Labcorp (010413) or Quest (568). ## Biomarkers measured - Intrinsic Factor Blocking Antibody ## Price by lab | Lab | Test price | All-in (with $6 fee) | Notes | | --- | --- | --- | --- | | Quest Diagnostics | $169.99 | $175.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | | Labcorp | $159.99 | $165.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | Rhode Island is not served. Prices are identical online and in the lab; no draw fee or physician fee is added. ## How much does an Intrinsic Factor Blocking Antibody test cost? An Intrinsic Factor Blocking Antibody test costs $159.99 at TestWell — $165.99 all-in, since the $6 lab processing fee is charged once per order and there is no draw or physician fee. Hospital outpatient labs typically bill around $300.00 self-pay. With insurance you pay your plan's negotiated rate against your deductible; TestWell's price is fixed before the draw and HSA/FSA-eligible. | Where you order | Price | One test, all-in | Notes | | --- | --- | --- | --- | | TestWell (drawn at Quest or Labcorp) | $159.99 | $165.99 | Includes the one $6 lab processing fee, charged once per order | | Hospital outpatient lab, self-pay (typical) | $300.00 | $300.00 | Reference figure; hospital charges vary widely by facility and are often higher | Lab test codes: Quest test code 568 · Labcorp test no. 010413. ## How do you prepare? No fasting required. If you receive vitamin B12 injections, draw before an injection or at least a week after one — recent injected B12 can cause a false positive. ## Common questions about the Intrinsic Factor Blocking Antibody test ### How long does it take to get Intrinsic Factor Blocking Antibody test results? Intrinsic Factor Blocking Antibody test results are typically ready in 3–5 business days after your draw at Quest or Labcorp. TestWell emails you the moment they post, and your results dashboard shows each marker against its reference range with a plain-English explanation. ### Do I need to fast, or can I eat before an Intrinsic Factor Blocking Antibody test? No, fasting is not required for an Intrinsic Factor Blocking Antibody test — you can eat normally and book any time of day. If you receive vitamin B12 injections, draw before an injection or at least a week after one — recent injected B12 can cause a false positive. ### Where can I get an Intrinsic Factor Blocking Antibody test near me without a doctor? Order the Intrinsic Factor Blocking Antibody test online from TestWell for $159.99 (plus a $6 per-order lab processing fee) — no doctor's visit, referral or insurance needed. A licensed physician authorizes the order, then you walk into any Quest or Labcorp patient service center near you for the draw (the lab locator on our site lists the closest ones by ZIP code), and results arrive in 3–5 business days. ### What are the Quest and Labcorp test codes for an Intrinsic Factor Blocking Antibody test? The Intrinsic Factor Blocking Antibody test is Quest Diagnostics test code 568, Labcorp test number 010413 ("Intrinsic Factor Abs, Serum"). TestWell orders it under those codes for $159.99 at Quest or Labcorp — no doctor's visit or insurance required, results in 3–5 business days. Codes verified against the labs' catalogs in 2026. ## How to order 1. Add to cart: https://www.test-well.com/cart?add=intrinsic-factor-antibody&utm_source=ai_agent&utm_medium=markdown 2. Create an account or sign in, confirm your state and preferred lab, pay by card, HSA or FSA. 3. A licensed physician authorizes the order (usually within minutes); the requisition arrives by email. 4. Walk into any Quest Diagnostics, Labcorp patient service center — no appointment needed at most sites. 5. Results post to your TestWell portal in 3–5 business days with reference ranges and flags. ## Related - [Autoimmune Gastritis Panel](https://www.test-well.com/tests/autoimmune-gastritis-panel) — 4 tests · $199.99 - [Transferrin](https://www.test-well.com/tests/transferrin) — $23.99 - [All Iron & Anemia tests](https://www.test-well.com/tests/category/iron-anemia) - [Full test directory](https://www.test-well.com/tests/directory) --- Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-10-28. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md Canonical page: https://www.test-well.com/tests/intrinsic-factor-antibody Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.