Since 80% of persons with gallstones have no symptoms, it is important to realize that tests for gallstones are only needed when symptoms are present. Your doctor will know which of the following tests would be best for you.
Abdominal Ultrasound: this is the safest, simplest and most readily available test to diagnose gallstones. Sonar waves from a probe are passed over the abdomen to visualize the gallbladder and detect the presence of stones. This test is not an x-ray and can be safely performed during pregnancy.
OCG (Oral Cholecystogram): this is an x-ray test. Iodine pills are given and an x-ray taken the following day. This test should not be performed during pregnancy.
CT Scan (computerized tomography): this test uses x-rays which are not safe during pregnancy. This test is not very accurate for diagnosing gallstones.
Nuclear Scan (HIDA, DISIDA): This test involves injection of a tiny amount of radioactive tracer into the blood, which quickly accumulates in the liver and gallbladder and can be seen with a special camera. This is a very accurate and safe test during an acute attack, but generally is not recommended during pregnancy.
ERCP (Endoscopic Retrograde Cholangiopancreatogram): This is a very important x-ray test that is used only in special cases. It is generally not done during pregnancy. Sometimes, the ERCP test is the only way to diagnose gallstones or stones that have migrated into the bile duct. This procedure may be used to remove gallstones that have migrated into the bile duct and sometimes avoid the need for surgery.
Infection of the bile ducts is called cholangitis. This is a very serious medical illness, characterized by abdominal pain, fever, yellowing of the eyes and skin (jaundice), and even infection in the blood stream. When cholangitis occurs, the ERCP test is usually done on an emergency basis to remove obstructing stones and drain the infection.