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A blood test is a lab analysis of things that may be found in your blood. You may have blood tests to keep track of how well you are managing a condition such as diabetes or high cholesterol. You may also have them for routine checkups or when you are ill.
Blood tests are very common. They are ordered by healthcare providers to:
Find out how well organs such as your kidneys, liver, heart, or thyroid are working
Help diagnose diseases such as cancer, diabetes, coronary heart disease, and HIV/AIDS
Find out if your medicine is working to make you better
Diagnose bleeding or clotting disorders
Blood tests can give your healthcare provider a lot of information. He or she can see if certain elements in your blood are in a normal range. But in many cases, blood tests are only part of the information your healthcare provider needs to make a diagnosis of a health condition. You might need to have some other types of tests as well.
For some blood tests, you will have to not eat (fast) for a certain amount of time before the blood test. This usually means no eating or drinking anything after midnight before the test. These tests are often scheduled for early in the morning.
