Step I plasma osmolality equations

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aspiringmd1015

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Kaplan Q bank had some extra equations that i havent seen yet in other sources, ie FA/UW/RX at least to my knowledge. (total body osmoles-urine osmoles/total body water - urine volume) has anyone seen these on any nbme's or anything?
Also, is there anyway to differentiate craniopharyngioma's from pituitary adenoma's, besides the direction of compression of the chiasm, calcicifation of craniopharyngioma's, and the difference in germ layer derivatives?