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Jason, > Thanks for your help with this. I have to disagree a bit with your point > about IU, though. IU isn't much different than moles. We can express 1 mole > of magnesium sulfate in equivalent g of Mg and also g S. I'll note that > UDUNITS2 doesn't require a measure of mole equivalents for all possible > compounds and their constituents. Moreover, since one can't convert moles of > S to moles of SO4, by the logic provided there should be no mole unit all. You've correctly identified the problem. The UDUNITS package can't convert between moles and kilograms. The same applies for conversion between IU and either moles or kilograms. > Clinical data is recorded, in any case, as ALT, AST, ALP, etc. in (U/L) or > (U/mL) or just (U). The first thing we do is convert to either mass or mole > units. Just being able to process 23 U/L of AST with a constant of x mg/U > (much like a molecular weight) is hugely helpful. > > I was able to get "U" into the units database with the tips given and given > known conversion factors I can do what I need now. Thanks for you help. Good luck. Regards, Steve Emmerson Ticket Details =================== Ticket ID: GXI-877591 Department: Support UDUNITS Priority: Normal Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.