Related Clues:

• Doctor's order, at times
• True-false, for one
• Not an actual alert
• Pop quiz, e.g.
• Do lab work on
• Clinical study
• Reason to say "1, 2, 3..."
• Run up the flagpole, e.g.
• Hurdle of sorts
• Midterm event
• Do lab work
• Multiple choice, say
• Give a whirl
• Part of 57-Down
• Measuring device