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Answer :
Final answer:
A lavender tube is typically used for WBC and RBC counts, while a green tube is typically used for electrolyte testing in a capillary blood draw.
Explanation:
The tubes used for capillary blood collection depend on the specific tests ordered and the order of draw principles. To test for White Blood Cells (WBCs) and Red Blood Cells (RBCs), a lavender tube is typically used as it contains EDTA, an anticoagulant that prevents the blood from clotting and preserves the shape of the blood cells.
Meanwhile, for electrolyte testing, a green tube containing heparin may be typically used.
Therefore, the blood draw for WBC, RBC and electrolyte tests would generally involve a lavender tube for the cell counts and a green tube for electrolytes.
It's important to note that special protocols may exist for pediatric or capillary samples due to the smaller volume of blood. Always follow your lab's specific protocol.
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