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Blood studies are tests that examine a patient’s blood. They are the most common tests done for cancer patients. They help doctors follow the course of a patient's disease and select the right treatment dosage.
Blood can be drawn for blood chemistry studies in a variety of ways, depending on your child’s situation. The most common way to draw blood is to insert a needle into a vein. Blood can also be taken from a central venous line (a tube inserted into a large vein during a period of treatment).