In a message dated 5/14/98 3:02:08 PM EST, [log in to unmask] writes: << I'll be getting a detailed lipid profile of blood done this summer, >> How long do you refrain from any food before having bloodwork for lipid profile? It is absolutely essential to fast for 12 to 14 hours before the blood is taken for the lipid values to be meaningful and not just reflective of the last meal taken.