what tubes is used for electrolytes
It should not be used for collection of blood for lithium levels. Heparin is the only anticoagulant that should be used in a blood collection device for the determination of pH, blood gases, electrolytes and ionized calcium. Heparin should not be used for coagulation or hematology testing. The heparin used in BD VacutainerÂ® Blood Collection Tubes and BD MicrotainerÂ® Tubes is preservative free. The recommended range of heparin in evacuated tubes is 10 to 30 USP units of heparin/mL of blood.