count the number of tests analyzed based on patient and date range

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Hi, I need to count the number of times a test is analyzed where one should only count cases at 1 month intervals for each patient.
see attached example.

hope someone can help with this. Until now, I have tried the "if" formula, but have not succeeded.
1 Reply

Hi @ingeoa88 


I did not undertand why you did not wanted 20.02.2020 to be counted, because that does not follow the pattern. 


The combination Patient ID and month Value would be a Uniq value. And you will only get 11 12 111. Counting teh leftmost value in that dynamyc list will give you the result. 


Best Regards

- Geur