Complete Blood Count (CBC) Test Overview

A complete blood count (CBC) is a common blood test that measures the different cells in your blood, including red blood cells, white blood cells, and platelets, which carry oxygen, fight infection, and help your blood clot.

The amylase test measures the level of amylase, a digestive enzyme, in your blood serum or plasma. This particular test is performed after you receive a "challenge" substance (such as a meal or secretin), and it is the first blood sample taken after the challenge. The test helps doctors evaluate how your pancreas responds to stimulation.

Your doctor may order this test during a routine checkup, to help find the cause of symptoms such as fatigue, fever, weakness, or unusual bruising, or to monitor an ongoing condition like anemia, infection, inflammation, or a blood disorder.

This test is primarily used to assess pancreatic function. Your doctor may order this test if you have symptoms suggesting pancreatic problems, such as abdominal pain, nausea, vomiting, or unexplained weight loss. It can help diagnose conditions like acute or chronic pancreatitis, pancreatic insufficiency, or other disorders affecting the pancreas.

A healthcare professional will draw a small sample of blood from a vein in your arm, usually on the inside of your elbow. The procedure takes only a few minutes, and the sample is then sent to a laboratory where the blood cells are counted and examined.

A healthcare professional will first give you a challenge substance (this may be a special drink, medication, or other stimulus). After a specified period of time, a blood sample will be drawn from a vein in your arm. The sample is then sent to a laboratory for analysis. You may need to fast before the test—follow your doctor's specific instructions.

Your results show the levels of each type of blood cell. Values that fall above or below the normal reference ranges may suggest conditions such as anemia, infection, dehydration, or clotting problems. Your doctor will interpret the numbers together with your symptoms and medical history.

Abnormally high amylase levels may indicate pancreatic inflammation (pancreatitis), pancreatic duct obstruction, or other pancreatic disorders. Low levels can sometimes indicate chronic pancreatic disease or liver problems. Your doctor will interpret your results based on your specific situation, symptoms, and other test findings.

This test is very safe. You may feel a brief sting when the needle is inserted, and the puncture site may be slightly sore or bruised for a day or two. Serious complications, such as infection or excessive bleeding, are rare.

The risks are minimal and include slight pain or bruising at the blood draw site, and rarely, infection. The challenge substance given before the test may cause mild discomfort in some individuals. Contact your healthcare provider if you experience unusual symptoms after the test.