A lavender-topped blood tube:
A. is used to determine a patient's hematocrit and hemoglobin levels.
B. contains a preservative to help determine blood-clotting factors.
C. is filled with heparin and is used to evaluate electrolyte and glucose levels.
D. contains no additives and is intended to clot if blood typing is needed
Answer: A. is used to determine a patient's hematocrit and hemoglobin levels.
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