1. Relationships between fractional excretion of Na (FENa) and FE of urea (FEurea) in 20 patients with SIADH (•) and 15 SD patients (○) with U/P creat <140 (left) and 22 patients with SIADH and six SD patients with U/P creat >140 (right).
Relationships between fractional excretion of Na (FENa) and FE of urea (FEurea) in 20 patients with SIADH (•) and 15 SD patients (○) with U/P creat <140 (left) and 22 patients with SIADH and six SD patients with U/P creat >140 (right). When U/P creat is <140, SD patients are all but one, localized in the area described by FENa <0.5% and FEurea <55%. Patients with SIADH differ from these by either a FENa >0.5% or a FEurea >55%. When U/P creat is >140, SD patients cluster still together, but the recognition area is now restricted to a lower FEurea and especially much lower FENa limit. All SD patients are found within the area determined by FEurea <45% and FENa <0.15%, and all but one patient with SIADH has either a FEurea value >45% or a FENa value >0.15%. Reprinted from reference (33), with permission from S. Karger AG.
Guy Decaux, and Wim Musch CJASN 2008;3:
©2008 by American Society of Nephrology