Parietal Cell Antibodies Test
Uncover the autoimmune cause of stubborn B12 deficiency.
The parietal cell antibodies test is used to investigate autoimmune causes of vitamin B12 deficiency and to support the diagnosis of autoimmune atrophic gastritis and pernicious anaemia. It is particularly relevant for people with unexplained low vitamin B12, macrocytic anaemia, chronic gastrointestinal symptoms, or other autoimmune conditions such as thyroid disease, type 1 diabetes, or coeliac disease. It may also be requested when a clinician suspects malabsorption or when neurological symptoms suggest B12 deficiency.
Parietal cells are found in the stomach lining and produce both hydrochloric acid and intrinsic factor, a protein essential for absorbing vitamin B12 from the diet. Antibodies directed against parietal cells can damage these cells, reducing acid and intrinsic factor production. This can lead to impaired B12 absorption, low B12 levels, and eventually megaloblastic anaemia and neurological complications if left untreated.
What this test measures
- Parietal cell antibodies (PCA): autoantibodies that target the acid-producing parietal cells of the stomach. Their presence supports an autoimmune basis for atrophic gastritis and pernicious anaemia.
Why it matters
Identifying parietal cell antibodies helps explain persistent or unexplained vitamin B12 deficiency, guides appropriate treatment such as lifelong B12 replacement, and can prompt screening for other associated autoimmune conditions. Early detection reduces the risk of irreversible neurological damage and allows for effective, targeted management.
Autoimmune Gastric Markers
- Parietal cell antibodies (PCA)
No special preparation required.
For blood tests, we recommend drinking plenty of water beforehand to ensure smooth sample collection. If you are taking any regular medication, continue to do so unless advised otherwise by your doctor.
Important Clinical Information:
This test is a screening tool to monitor and support your overall health. It does not replace your GP or consultant.
Always discuss your test results, especially any abnormal results, with your GP, who can interpret them in the context of your medical history and overall health.