Anti Parietal Cell Antibody (APCA)

Anti Parietal Cell Antibody (APCA)

The Anti Parietal Cell Antibody (APCA) test detects antibodies directed against the parietal cells of the stomach lining. These cells are responsible for producing stomach acid and intrinsic factor, which is essential for Vitamin B12 absorption. Presence of APCA is commonly associated with autoimmune gastritis and pernicious anemia.

Why is this test done?

This test is recommended to:

• Help diagnose pernicious anemia
• Detect autoimmune gastritis
• Evaluate unexplained Vitamin B12 deficiency
• Investigate chronic fatigue, weakness, or neurological symptoms
• Support diagnosis of autoimmune disorders affecting the stomach

Symptoms that may require APCA testing

• Fatigue and weakness
• Pale skin
• Tingling or numbness in hands and feet
• Memory or concentration problems
• Sore tongue
• Loss of appetite
• Digestive discomfort

Sample Required

• Sample Type: Serum (Blood sample)

Test Method

• Indirect Immunofluorescence / ELISA (method may vary by laboratory)

Preparation

• No special fasting is usually required unless advised by the physician.

Interpretation

• Positive APCA: May indicate autoimmune gastritis or pernicious anemia.
• Negative APCA: Usually suggests absence of autoimmune damage to gastric parietal cells.

Clinical Significance

APCA is frequently detected in patients with:

• Pernicious anemia
• Autoimmune thyroid disease
• Type 1 diabetes
• Chronic autoimmune gastritis

Early detection can help prevent complications related to long-term Vitamin B12 deficiency and gastric mucosal damage.