The problem with what you are describing (or at least what I think you are
describing - it's very vague) is that your conditional  formatting formula is
going to have to look at B3 and make the same decisions that your main
formula has already made. While this is perfectly possible, it's
cumbersome.

You should really bring your selected limits up onto row 3 as upper/lower.
Then it's easy enough to compare the value against your upper and lower
limits in your conditional formatting  statement.