Urine Osmolar Gap Calculation
Urine Osmolar Gap represents ammonium salts = Measured Urine Osmolality - (2 x Na + 2 x K + Urea/2.8)
Urine Osmolar Gap / 2 < 150 -> RTA 1 and 4
Urine Osmolar Gap / 2 > 400 -> Look to the gut
Joel Topf, MD FACP @kidney_boy
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