Diagnosing Autoimmune Pancreatitis

Overview

Autoimmune pancreatitis (AIP) is a specific type of pancreatitis (inflammation and swelling of the pancreas) caused by the immune system attacking the pancreas. It has two types: type 1 and type 2.

Type 1 AIP is the most common and happens when a specific antibody called IgG4 attacks healthy tissue in the pancreas. It may also affect other organs such as the bile ducts, kidneys, and thyroid. Type 2 AIP has different features and affects people differently than type 1.

To diagnose autoimmune pancreatitis, several exams, screening tests, and procedures may be done. These include:

• History and physical exam: The healthcare provider will ask about your symptoms and any factors that could be related to your condition. They will look for:
  • Abdominal pain, especially in the upper abdomen
  • Jaundice: Yellowing of the skin or eyes, which may indicate a bile duct blockage
  • Weight loss: Unplanned or unexplained weight loss
  • Larger than normal pancreas: Swelling or enlargement of pancreas
  • Noncancerous growths: May be confused with pancreatic cancer but are noncancerous (benign)
• Imaging tests: Imaging tests provide a view of the pancreas and its ducts. These tests can help rule out other conditions and show signs of autoimmune pancreatitis.
  • Common imaging tests include computed tomography (CT) scans, magnetic resonance imaging (MRI) scans, and ultrasounds.
• Blood tests: Several types of blood tests may be used to help in making a diagnosis.
  • IgG4 levels: High levels of IgG4 antibodies are often seen in type 1 AIP. This is a key marker for diagnosing the condition.
  • Liver function tests: These check for signs of bile duct blockage, which can happen if the pancreas is inflamed.
  • Inflammation markers: Tests such a C-reactive protein (CRP) can show inflammation in the body, showing an active immune response.
• Biopsy: In some cases, a biopsy may be done to collect a small sample of tissue from the pancreas for more testing

These exams, tests, and procedures are done by various healthcare providers involved in diagnosing autoimmune pancreatitis, including nurses, physician assistants, lab technicians, and doctors who specialize in gastroenterology (digestive issues) or hepatology (liver issues).

It's important to note that these exams and tests should always be discussed with a healthcare professional who can give advice based on your specific situation.