Categorise test results into Normal High/Low or Critical High/Low

I am working on issue MF-476 and I need to categorise the results into 2 categories as given in the ticket’s description:

  1. Norrmal High/ Low
  2. Critical High/ Low

I wanted the data by which I can reference the test result data in the above categories. As far as I saw the API regarding fetching the Vital results, I didn’t find any reference in there. Can someone help me out in this?