The gunk in the bottom of blood draw vials is silicone. The vial is called a "Serum Separator Tube". When the blood is centrifuged the blob of silicone slides up the tube and separates the serum from the packed red cells. Most blood tests are done with the serum rather than the whole blood. A grey-topped tube is used for blood sugar only. The silicone is inert and should not affect a meter or any other machine.
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The vial is called a "Serum Separator Tube". When the blood is centrifuged the blob of silicone slides up the tube and separates the serum from the packed red cells. Most blood tests are done with the serum rather than the whole blood. letrozole buy
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