Fractionate excretition of uric acid
FEua is important in the differential diagnosing of SIADH when the patient takes diuretics. FEua >12% is SIADH
FEua <8% excludes SIADH. J Clin Endocrinol Metab. 2008 Aug;93(8):2991-7
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Vidar Skogstrøm
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FEUrea is already included, search for urea.