The second test, without a tourniquet, produced a normal result. Blood tests are an indispensable tool of medicine. They're used to screen, diagnose, confirm, and monitor diseases. There are many ...

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The RDW blood test is commonly performed both for screening ... with an antiseptic and apply a tourniquet to make the vein easier to see. They will then insert the needle through your skin and ...

one or more tubes may be drawn depending on what other tests are also ordered. Once the blood is obtained, the tourniquet is released and the draw site is covered with a sterile bandage.