A Gastric Emptying Study is a diagnostic test that measures how quickly a meal leaves the stomach. It is most commonly performed in nuclear medicine using a small amount of radiotracer mixed into food. Clinicians use it to evaluate symptoms that suggest abnormal stomach motility (movement). It is frequently ordered in gastroenterology and GI surgery settings.

Alpha Fetoprotein is a protein normally made in large amounts by a developing fetus. In healthy non-pregnant adults, Alpha Fetoprotein is usually present at very low levels. Clinicians most often measure Alpha Fetoprotein with a blood test. It is commonly discussed in hepatology for liver tumors and in obstetrics for fetal assessment.

CA 19-9 is a blood-based biomarker commonly discussed in pancreatic and biliary (hepatobiliary) disease. It is short for carbohydrate antigen 19-9 (CA 19-9), a sugar-containing marker found on certain mucin proteins. Clinicians most often use CA 19-9 to support cancer evaluation and to follow disease over time. It is not a stand-alone diagnostic test and is interpreted in clinical context.

CEA stands for carcinoembryonic antigen. CEA is a blood-measurable protein that can be higher in some cancers, especially colorectal adenocarcinoma. CEA is most commonly used as a **tumor marker** to support monitoring over time. CEA is also referenced in gastroenterology, hepatology, and GI oncology when interpreting cancer follow-up and liver-related clearance.

Tumor Markers are measurable substances linked to cancer or to the body’s response to cancer. They are most often checked in blood, but some are measured in urine, stool, or tissue. In gastroenterology and hepatology, they are commonly used alongside imaging and endoscopy. They help clinicians assess risk, track disease over time, and monitor treatment response.

Lipase is an enzyme that breaks down dietary fat into smaller molecules the body can absorb. In clinical care, Lipase most often refers to a blood test measuring pancreatic lipase activity. It is commonly used when clinicians evaluate abdominal pain and suspected pancreatic disease. It is also discussed in digestion, malabsorption, and pancreatic function.

Amylase is an enzyme that helps break down carbohydrates into smaller sugars. It is produced mainly by the pancreas and the salivary glands. In clinical medicine, Amylase is commonly measured with a blood test (and sometimes a urine test). It is often discussed when evaluating pancreatic and upper abdominal conditions.

INR is the **International Normalized Ratio**, a standardized way to report blood clotting time. It is calculated from the **prothrombin time (PT)** to help results stay comparable across laboratories. INR is commonly used to monitor **warfarin** therapy and to assess **liver-related changes in coagulation**.

Prothrombin Time is a blood test that measures how quickly plasma forms a clot. It reflects the function of specific clotting proteins made largely by the liver. It is commonly reported in seconds and often standardized as the international normalized ratio (INR). It is widely used in hepatology, peri-procedural care, and anticoagulation monitoring.

Total Protein is a blood (or body fluid) measurement of the combined amount of protein present. In serum, it mainly reflects albumin plus a broad group called globulins. It is commonly reported on routine chemistry panels and in evaluations of liver disease, nutrition, and inflammation. In gastroenterology and hepatology, it is often interpreted alongside albumin, liver enzymes, and bilirubin.