They did not compare with results of other patient's tested at the same time.
They did not compare with the results of the control specimen.
A Delta check was automatically initiated by the testing machine when the current results did not compare closely to the patient's previous results.
All of the Above
Stop and clean it up
Continue the draw but make sure to warn people to stay away
Ask the patient to hold the needle while you clean it up
Leave it for housekeeping
Here's an interesting quiz for you.