Possible Clues:

• "Bad" cholesterol, initially
• Blood test letters
• So-called 'bad cholesterol'
• Cholesterol that doesn't start with H (I can never remember which is the good one)
• 'Bad' cholesterol letters
• The ''bad cholesterol'': Abbr.
• Blood-work letters
• The "bad" lipoprotein
• ''Bad'' checkup letters
• 'Bad' cholesterol briefly,