Many people have blood drawn for several reasons. This can include the following:

There are many different reasons plus hundreds more for why doctors need to draw blood. You may feel ill and the doctor will order blood work because the tests they perform in the lab can tell your doctor many things about your body and overall health. Some of the tests will show exactly what is wrong with you. Just like a throat culture, there are certain elements that show up that say…yes this is strep throat. Blood is like that as well. Certain aspects of the blood can say…yes you have low iron. Your blood can tell so much. Your doctor can also get cells and plasma from your blood work. When they take a cross and match this will determine what blood type you are. This is very helpful in transplant donations.