QC protocols prohibit use of outdated evacuated tubes because:
a.) additives that speed up clotting crystalize on the sides of the tube
b.) bacteria begin to grow in these tubes, yielding erroneous results
c.) stoppers may shrink, allowing specimen leakage if the tube is inverted
d.) tubes may not fill completely, changing additive-to-sample ratio
Answer: c.) stoppers may shrink, allowing specimen leakage if the tube is inverted
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