Complete Blood Count (CBC) Test Overview

A complete blood count, or CBC, is a common blood test that measures the different cells in your blood, including red blood cells, white blood cells, and platelets. These measurements help your doctor evaluate your overall health and detect a wide range of conditions, from anemia to infection.

The amylase test measures the amount of amylase in your blood. Amylase is a digestive enzyme produced mainly by the pancreas and salivary glands that helps break down carbohydrates in food. The test may measure either pancreatic amylase (P2) specifically or total amylase (both pancreatic and salivary gland amylase).

Your doctor may order this test as part of a routine checkup, to look into symptoms such as fatigue, weakness, fever, or unusual bruising, or to monitor an existing condition like anemia or infection and check how well your treatment is working.

Your doctor may order an amylase test if you have symptoms of pancreatic problems, such as severe abdominal pain, nausea, vomiting, fever, or loss of appetite. It is commonly used to diagnose and monitor conditions like acute pancreatitis (sudden pancreas inflammation), chronic pancreatitis, pancreatic cancer, and other disorders affecting the pancreas. The test may also help identify problems with the salivary glands or certain kidney conditions.

In most cases, no special preparation is needed for a CBC, and you can usually eat and drink normally before the test. If your blood sample will also be used for other tests that require fasting, your doctor will give you specific instructions ahead of time. Tell your care team about any medicines or supplements you take.

You may need to fast (not eat or drink anything except water) for 8-12 hours before the test. Your doctor will provide specific instructions. Inform your healthcare provider about all medications you are taking, as certain drugs can affect amylase levels. Some medications that may impact results include birth control pills, corticosteroids, diuretics, and some pain medications.

During the test, a health professional will wrap a band around your upper arm, clean the skin at the inside of your elbow, and insert a small needle into a vein to collect a blood sample into a tube. The needle usually causes only a quick pinch, and the whole process takes just a few minutes.

A healthcare professional will draw a blood sample from a vein in your arm using a small needle. The procedure takes only a few minutes. You may feel a brief pinch or sting when the needle is inserted. After the blood is collected, the sample is sent to a laboratory for analysis. Results are typically available within 1-2 days.

A CBC is very safe, and serious problems are rare. You may feel a slight sting when the needle goes in, and the puncture site may be a little sore or bruised for a day or two. Some people feel briefly dizzy or lightheaded during a blood draw. Call your doctor if bleeding does not stop or you notice signs of infection.

The amylase test is generally safe with minimal risks. Possible minor side effects include slight pain or bruising at the injection site, lightheadedness, or in rare cases, infection. These risks are similar to those of any routine blood test.