From: poutnik4nntp@gmail.com   
      
   Dne 09/10/2016 v 20:05 W napsal(a):   
      
   >   
   > Expressing results per gram or mol of creatinine is a normal convention for   
   > urine tests.   
      
   Sure.   
      
   > So in this case the matrix value would be for urea?  From   
   > Wikipedia the molar mass of urea is 60.06 g*mol^-1   
      
   Only in case the urine does not contain water.   
   For water solutions is content related to water malar mass.   
   >   
   > Somehow this is not working out because the mcg/mg number needs to be   
   > increased, not decreased, to fit into the mmol/mol range limits I am   
   > matching against.   
   >   
   even for urea it would get decreased.   
   You need to know what is the reference substance.   
   By default it is solvent, but it may be whatever.   
      
   --   
   Poutnik ( The Pilgrim, Der Wanderer )   
   Knowledge makes great men humble, but small men arrogant.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)