Parietal Cell Antibody (PCA)

Parietal Cell Antibody (PCA) Test

The Parietal Cell Antibody (PCA) test detects antibodies against gastric parietal cells, which produce stomach acid and intrinsic factor (needed for vitamin B12 absorption). This test helps diagnose autoimmune gastritis and pernicious anemia.

Why is the Test Done?

✅ Diagnose pernicious anemia (a cause of vitamin B12 deficiency)
✅ Identify autoimmune gastritis (chronic atrophic gastritis)
✅ Evaluate unexplained vitamin B12 deficiency
✅ Investigate causes of malabsorption, megaloblastic anemia, or neurological symptoms

Understanding Test Results

📌 A positive PCA test suggests an autoimmune attack on stomach cells but does not confirm pernicious anemia by itself.

Conditions Associated with a Positive PCA Test

🔹 Pernicious Anemia – Vitamin B12 deficiency due to lack of intrinsic factor
🔹 Autoimmune Gastritis – Chronic inflammation of the stomach lining
🔹 Other Autoimmune Disorders – Hashimoto’s thyroiditis, Type 1 diabetes, Addison’s disease
🔹 Helicobacter pylori (H. pylori) Infection – May trigger autoimmune response

Symptoms of Autoimmune Gastritis & Pernicious Anemia

🔴 Digestive Issues:
✔ Indigestion, bloating, nausea
✔ Loss of appetite, weight loss

🧠 Neurological Symptoms (B12 Deficiency):
✔ Tingling, numbness (paresthesia)
✔ Memory problems, difficulty concentrating
✔ Mood changes (irritability, depression)

💪 Hematologic Symptoms (Anemia):
✔ Fatigue, weakness
✔ Pale skin
✔ Shortness of breath

Next Steps After a Positive Test

🔬 Additional Tests May Include:
✔ Intrinsic Factor Antibody Test – Confirms pernicious anemia
✔ Vitamin B12 Levels – Checks for deficiency
✔ Complete Blood Count (CBC) – Evaluates anemia
✔ Gastrin Levels – High in autoimmune gastritis
✔ Endoscopy with Biopsy – Detects stomach lining damage

📌 If pernicious anemia is confirmed, treatment includes lifelong vitamin B12 supplementation (injections or high-dose oral B12).