Calcium Infusion Test

What the Calcium Infusion Test Means

The calcium infusion test is a medical procedure used mainly to help find a rare type of tumor called a gastrinoma. Gastrinomas develop in the pancreas and produce too much gastrin, a hormone that signals the stomach to make acid. During the test, a patient receives calcium gluconate—a form of calcium—slowly through an intravenous (IV) line over about three hours. Blood samples are taken before and during the infusion to measure gastrin levels. Calcium can stimulate gastrinoma cells to release gastrin, so a significant rise in gastrin after the infusion may suggest the presence of this tumor.

Why the Test Can Matter in Cancer Care

Gastrinomas are rare pancreatic tumors that cause excess stomach acid, which can lead to symptoms like stomach ulcers, diarrhea, and abdominal pain. Identifying these tumors helps doctors plan the right treatment and manage symptoms. The calcium infusion test is not a routine blood test but a specialized procedure used when a doctor suspects a gastrinoma based on symptoms or other findings. It helps support the diagnosis but does not confirm cancer on its own.

What Patients Might Experience and See

If your doctor recommends this test, you will have an IV line placed in your arm to receive calcium gluconate over about three hours. Blood samples will be taken before and during the infusion to measure gastrin levels. You will likely stay in the clinic or hospital during this time. The test is generally safe but may cause some mild discomfort from the IV or side effects related to calcium. Your healthcare team will explain what to expect and how the results will be used.

Understanding Test Results and Next Steps

A rise in gastrin levels after the calcium infusion may suggest a gastrinoma, but it does not automatically mean cancer. Other conditions can affect gastrin levels, so doctors interpret the results alongside other tests and your symptoms. This test is one tool among many to understand pancreatic tumors and guide care. If you have questions about why the test is recommended or what the results mean, it’s important to discuss them openly with your healthcare team.

How to Use This Information

Hearing about the calcium infusion test can feel overwhelming, but understanding its purpose can help you feel more prepared. It is used to help diagnose a rare pancreatic tumor that affects stomach acid production. The test results are part of a larger picture your doctors use to decide on further testing or treatment. Always ask your care team how this test fits into your personal diagnosis and treatment plan. They can provide the best guidance based on your unique health situation.