Excreción de sodio fraccionada; FENa
Una interpretación significativa del examen se puede hacer únicamente cuando el volumen de orina haya descendido a menos de 500ml/día.
Un FENa de menos del 1% indica disminución del flujo sanguíneo al riñón, mientras que un FENa superior a este porcentaje (y usualmente superior a 3%) sugiere que hay daño renal.
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