Final answer:
The correct order of draw for the options provided is Green, Lavender, Gray, which is option C. The Green tube contains heparin, the Lavender tube has EDTA, and the Gray tube has potassium oxalate/sodium fluoride.
Step-by-step explanation:
The correct order of draw for a venipuncture according to the Clinical and Laboratory Standards Institute (CLSI) is as follows: blood cultures, light blue, red, green, lavender, gray, and so on. Therefore, the correct order of draw for a phlebotomy technician to identify among the options given would be Green, Lavender, Gray which corresponds to option C. Green tubes typically contain heparin used for chemistry tests, Lavender tubes contain EDTA used for hematology tests, and Gray tubes often contain potassium oxalate/sodium fluoride used for glucose/glycolytic inhibitor tests.
It is essential for phlebotomists to follow the correct order of draw to prevent cross-contamination between additives in different tubes which could affect the outcome of the tests.