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Hell's Bells, I can't get the spreadsheet to come out right. I may have to defer that to my teenage son. I'm not sure how my children were born with these skills when neither of their parents have them.

Sorry for the delay in Thanking you for your assistance. I think I have figured out how to get the numbers I need. The countif function gives me the number of time each exam was performed, not necessarily the number of patients that had both exams in the same visit. I probably did not explain...

I'm trying to create a formula to calculate the number of patients undergoing the same set of exams. Example: Pt ID Exam A CT abd without contrast A CT abd with contrast B CT abd without contrast C CT head D CT abd without...