Okay, I was in the situation where I wanted the creatinine clearance. I had the eGFR, the 24 hour urinary volume, the serum creatinine, and the urinary creatinine, but not the formula to hand. Ringing the laboratory, I was passed from one barely English speaking person to another with no one knowing how to do the calculation. Seems the eGFR is all they know these days. Googling the calculation was tricky because almost all of the formulae I could find used American units. So, here's a SI calculator for the custom tab: Code: label "Creatine Clearance Calculator" return group-box "mL/min" -1x-1 data [ label "Urine Volume (mL)" uvolume: field 20 return label "Period ( hours )" time: field 20 return label "Serum Creat (umol/L)" serumcreatinine: field 20 return label "Urine Creat (mmol/L)" urinecreatinine: field 20 return button -1 "Calculate" [ r: (to-decimal urinecreatinine/text) * (to-decimal uvolume/text) / (to-decimal serumcreatinine/text) / ( to-decimal time/text ) / 60 * 1000 set-text result form round/to r .1 ] result: field 20 ] and in the end, the eGFR was 60 mL/min, and the calculation 48 mL/min. Was it worth the trouble??
