title: Conditional formatting in Excel, not blank and less than for whole column?
body: <p>I am making a spreadsheet to track my blood sugars, yes I'm diabetic, I want several columns to to be able to highlight red if the number is less than 70. Easy I thought but the problem is when I do that all of the blank ones highlight red. In an ideal world and if it were up to my doctor there wouldn't be any "blank" cells, but I'm not perfect. </p>