Which position corresponds to the eighth tube in the evacuated tube order?

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Multiple Choice

Which position corresponds to the eighth tube in the evacuated tube order?

Explanation:
In this testing context, the order of draw is a fixed sequence designed to prevent additive carryover from one tube into the next. The tube occupying the eighth position is the pink-top tube containing EDTA, used for immunohematology/blood banking tests. Placing EDTA toward the end keeps its anticoagulant from contaminating the tests drawn earlier, since EDTA can affect calcium-dependent tests and other chemistry results if carried over. The earlier tubes (such as the lavender EDTA for hematology or the gray fluoride/oxalate tube) are not in this eighth position, which is why that choice is correct.

In this testing context, the order of draw is a fixed sequence designed to prevent additive carryover from one tube into the next. The tube occupying the eighth position is the pink-top tube containing EDTA, used for immunohematology/blood banking tests. Placing EDTA toward the end keeps its anticoagulant from contaminating the tests drawn earlier, since EDTA can affect calcium-dependent tests and other chemistry results if carried over. The earlier tubes (such as the lavender EDTA for hematology or the gray fluoride/oxalate tube) are not in this eighth position, which is why that choice is correct.

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